MM-38164: Paginate the GetPostThread API (#19485)

We implement a cursor based pagination model to page through the posts in a given thread. The cursor is a combination of the post.CreateAt+ post.Id to differentiate multiple posts in a given timestamp. Some additional parameters like direction, fromPost, fromCreateAt and perPage were introduced to implement this. ```release-note NONE ```
2022-03-24 12:51:41 +05:30
--- a/api4/post.go
+++ b/api4/post.go
@@ -13,6 +13,7 @@ import (
 	"github.com/mattermost/mattermost-server/v6/audit"
 	"github.com/mattermost/mattermost-server/v6/model"
 	"github.com/mattermost/mattermost-server/v6/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/web"
 )

 func (api *API) InitPost() {
@@ -503,10 +504,56 @@ func getPostThread(c *Context, w http.ResponseWriter, r *http.Request) {
 	if c.Err != nil {
 		return
 	}
-	skipFetchThreads := r.URL.Query().Get("skipFetchThreads") == "true"
-	collapsedThreads := r.URL.Query().Get("collapsedThreads") == "true"
-	collapsedThreadsExtended := r.URL.Query().Get("collapsedThreadsExtended") == "true"
-	list, err := c.App.GetPostThread(c.Params.PostId, skipFetchThreads, collapsedThreads, collapsedThreadsExtended, c.AppContext.Session().UserId)
+
+	// For now, by default we return all items unless it's set to maintain
+	// backwards compatibility with mobile. But when the next ESR passes, we need to
+	// change this to web.PerPageDefault.
+	perPage := 0
+	if perPageStr := r.URL.Query().Get("perPage"); perPageStr != "" {
+		var err error
+		perPage, err = strconv.Atoi(perPageStr)
+		if err != nil || perPage > web.PerPageMaximum {
+			c.SetInvalidParam("perPage")
+			return
+		}
+	}
+
+	var fromCreateAt int64
+	if fromCreateAtStr := r.URL.Query().Get("fromCreateAt"); fromCreateAtStr != "" {
+		var err error
+		fromCreateAt, err = strconv.ParseInt(fromCreateAtStr, 10, 64)
+		if err != nil {
+			c.SetInvalidParam("fromCreateAt")
+			return
+		}
+	}
+
+	fromPost := r.URL.Query().Get("fromPost")
+	// Either both have to be set, or none have to be set.
+	// Setting one and not setting the other is an error.
+	if (fromPost == "" && fromCreateAt != 0) || (fromPost != "" && fromCreateAt == 0) {
+		c.SetInvalidParam("fromPost/fromCreateAt")
+		return
+	}
+
+	direction := ""
+	if dir := r.URL.Query().Get("direction"); dir != "" {
+		if dir != "up" && dir != "down" {
+			c.SetInvalidParam("direction")
+			return
+		}
+		direction = dir
+	}
+	opts := model.GetPostsOptions{
+		SkipFetchThreads:         r.URL.Query().Get("skipFetchThreads") == "true",
+		CollapsedThreads:         r.URL.Query().Get("collapsedThreads") == "true",
+		CollapsedThreadsExtended: r.URL.Query().Get("collapsedThreadsExtended") == "true",
+		PerPage:                  perPage,
+		Direction:                direction,
+		FromPost:                 fromPost,
+		FromCreateAt:             fromCreateAt,
+	}
+	list, err := c.App.GetPostThread(c.Params.PostId, opts, c.AppContext.Session().UserId)
 	if err != nil {
 		c.Err = err
 		return
--- a/api4/post_test.go
+++ b/api4/post_test.go
@@ -2184,6 +2184,22 @@ func TestGetPostThread(t *testing.T) {
 	require.Error(t, err)
 	CheckForbiddenStatus(t, resp)

+	// Sending some bad params
+	_, resp, err = client.GetPostThreadWithOpts(th.BasicPost.Id, "", model.GetPostsOptions{
+		CollapsedThreads: true,
+		FromPost:         "something",
+		PerPage:          10,
+	})
+	require.Error(t, err)
+	CheckBadRequestStatus(t, resp)
+
+	_, resp, err = client.GetPostThreadWithOpts(th.BasicPost.Id, "", model.GetPostsOptions{
+		CollapsedThreads: true,
+		Direction:        "sideways",
+	})
+	require.Error(t, err)
+	CheckBadRequestStatus(t, resp)
+
 	client.Logout()
 	_, resp, err = client.GetPostThread(model.NewId(), "", false)
 	require.Error(t, err)
--- a/app/app_iface.go
+++ b/app/app_iface.go
@@ -674,7 +674,7 @@ type AppIface interface {
 	GetPostIdAfterTime(channelID string, time int64, collapsedThreads bool) (string, *model.AppError)
 	GetPostIdBeforeTime(channelID string, time int64, collapsedThreads bool) (string, *model.AppError)
 	GetPostIfAuthorized(postID string, session *model.Session) (*model.Post, *model.AppError)
-	GetPostThread(postID string, skipFetchThreads, collapsedThreads, collapsedThreadsExtended bool, userID string) (*model.PostList, *model.AppError)
+	GetPostThread(postID string, opts model.GetPostsOptions, userID string) (*model.PostList, *model.AppError)
 	GetPosts(channelID string, offset int, limit int) (*model.PostList, *model.AppError)
 	GetPostsAfterPost(options model.GetPostsOptions) (*model.PostList, *model.AppError)
 	GetPostsAroundPost(before bool, options model.GetPostsOptions) (*model.PostList, *model.AppError)
--- a/app/channel_test.go
+++ b/app/channel_test.go
@@ -2084,7 +2084,7 @@ func TestMarkChannelAsUnreadFromPostPanic(t *testing.T) {

 	mockPostStore := mocks.PostStore{}
 	mockPostStore.On("GetMaxPostSize").Return(65535, nil)
-	mockPostStore.On("Get", context.Background(), "postID", false, false, false, "userID").Return(&model.PostList{}, nil)
+	mockPostStore.On("Get", context.Background(), "postID", model.GetPostsOptions{}, "userID").Return(&model.PostList{}, nil)
 	mockPostStore.On("GetPostsAfter", mock.AnythingOfType("model.GetPostsOptions")).Return(&model.PostList{}, nil)
 	mockPostStore.On("GetSingle", "postID", false).Return(&model.Post{
 		Id:        "postID",
--- a/app/file.go
+++ b/app/file.go
@@ -367,7 +367,7 @@ func (a *App) MigrateFilenamesToFileInfos(post *model.Post) []*model.FileInfo {
 	fileMigrationLock.Lock()
 	defer fileMigrationLock.Unlock()

-	result, nErr := a.Srv().Store.Post().Get(context.Background(), post.Id, false, false, false, "")
+	result, nErr := a.Srv().Store.Post().Get(context.Background(), post.Id, model.GetPostsOptions{}, "")
 	if nErr != nil {
 		mlog.Error("Unable to get post when migrating post to use FileInfos", mlog.Err(nErr), mlog.String("post_id", post.Id))
 		return []*model.FileInfo{}
--- a/app/opentracing/opentracing_layer.go
+++ b/app/opentracing/opentracing_layer.go
@@ -7639,7 +7639,7 @@ func (a *OpenTracingAppLayer) GetPostIfAuthorized(postID string, session *model.
 	return resultVar0, resultVar1
 }

-func (a *OpenTracingAppLayer) GetPostThread(postID string, skipFetchThreads bool, collapsedThreads bool, collapsedThreadsExtended bool, userID string) (*model.PostList, *model.AppError) {
+func (a *OpenTracingAppLayer) GetPostThread(postID string, opts model.GetPostsOptions, userID string) (*model.PostList, *model.AppError) {
 	origCtx := a.ctx
 	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.GetPostThread")

@@ -7651,7 +7651,7 @@ func (a *OpenTracingAppLayer) GetPostThread(postID string, skipFetchThreads bool
 	}()

 	defer span.Finish()
-	resultVar0, resultVar1 := a.app.GetPostThread(postID, skipFetchThreads, collapsedThreads, collapsedThreadsExtended, userID)
+	resultVar0, resultVar1 := a.app.GetPostThread(postID, opts, userID)

 	if resultVar1 != nil {
 		span.LogFields(spanlog.Error(resultVar1))
--- a/app/plugin_api.go
+++ b/app/plugin_api.go
@@ -661,7 +661,7 @@ func (api *PluginAPI) DeletePost(postID string) *model.AppError {
 }

 func (api *PluginAPI) GetPostThread(postID string) (*model.PostList, *model.AppError) {
-	return api.app.GetPostThread(postID, false, false, false, "")
+	return api.app.GetPostThread(postID, model.GetPostsOptions{}, "")
 }

 func (api *PluginAPI) GetPost(postID string) (*model.Post, *model.AppError) {
--- a/app/post.go
+++ b/app/post.go
@@ -168,7 +168,7 @@ func (a *App) CreatePost(c *request.Context, post *model.Post, channel *model.Ch
 	if post.RootId != "" {
 		pchan = make(chan store.StoreResult, 1)
 		go func() {
-			r, pErr := a.Srv().Store.Post().Get(sqlstore.WithMaster(context.Background()), post.RootId, false, false, false, "")
+			r, pErr := a.Srv().Store.Post().Get(sqlstore.WithMaster(context.Background()), post.RootId, model.GetPostsOptions{}, "")
 			pchan <- store.StoreResult{Data: r, NErr: pErr}
 			close(pchan)
 		}()
@@ -559,7 +559,7 @@ func (a *App) DeleteEphemeralPost(userID, postID string) {
 func (a *App) UpdatePost(c *request.Context, post *model.Post, safeUpdate bool) (*model.Post, *model.AppError) {
 	post.SanitizeProps()

-	postLists, nErr := a.Srv().Store.Post().Get(context.Background(), post.Id, false, false, false, "")
+	postLists, nErr := a.Srv().Store.Post().Get(context.Background(), post.Id, model.GetPostsOptions{}, "")
 	if nErr != nil {
 		var nfErr *store.ErrNotFound
 		var invErr *store.ErrInvalidInput
@@ -841,8 +841,8 @@ func (a *App) GetSinglePost(postID string) (*model.Post, *model.AppError) {
 	return post, nil
 }

-func (a *App) GetPostThread(postID string, skipFetchThreads, collapsedThreads, collapsedThreadsExtended bool, userID string) (*model.PostList, *model.AppError) {
-	posts, err := a.Srv().Store.Post().Get(context.Background(), postID, skipFetchThreads, collapsedThreads, collapsedThreadsExtended, userID)
+func (a *App) GetPostThread(postID string, opts model.GetPostsOptions, userID string) (*model.PostList, *model.AppError) {
+	posts, err := a.Srv().Store.Post().Get(context.Background(), postID, opts, userID)
 	if err != nil {
 		var nfErr *store.ErrNotFound
 		var invErr *store.ErrInvalidInput
@@ -887,7 +887,7 @@ func (a *App) GetFlaggedPostsForChannel(userID, channelID string, offset int, li
 }

 func (a *App) GetPermalinkPost(c *request.Context, postID string, userID string) (*model.PostList, *model.AppError) {
-	list, nErr := a.Srv().Store.Post().Get(context.Background(), postID, false, false, false, userID)
+	list, nErr := a.Srv().Store.Post().Get(context.Background(), postID, model.GetPostsOptions{}, userID)
 	if nErr != nil {
 		var nfErr *store.ErrNotFound
 		var invErr *store.ErrInvalidInput
@@ -1086,7 +1086,12 @@ func (a *App) GetPostsForChannelAroundLastUnread(channelID, userID string, limit
 		return model.NewPostList(), nil
 	}

-	postList, err := a.GetPostThread(lastUnreadPostId, skipFetchThreads, collapsedThreads, collapsedThreadsExtended, userID)
+	opts := model.GetPostsOptions{
+		SkipFetchThreads:         skipFetchThreads,
+		CollapsedThreads:         collapsedThreads,
+		CollapsedThreadsExtended: collapsedThreadsExtended,
+	}
+	postList, err := a.GetPostThread(lastUnreadPostId, opts, userID)
 	if err != nil {
 		return nil, err
 	}
@@ -1533,7 +1538,7 @@ func (a *App) countMentionsFromPost(user *model.User, post *model.Post) (int, in
 	// A mapping of thread root IDs to whether or not a post in that thread mentions the user
 	mentionedByThread := make(map[string]bool)

-	thread, err := a.GetPostThread(post.Id, false, false, false, user.Id)
+	thread, err := a.GetPostThread(post.Id, model.GetPostsOptions{}, user.Id)
 	if err != nil {
 		return 0, 0, err
 	}
--- a/app/post_metadata.go
+++ b/app/post_metadata.go
@@ -57,6 +57,7 @@ func (a *App) PreparePostListForClient(originalList *model.PostList) *model.Post
 		Order:      originalList.Order,
 		NextPostId: originalList.NextPostId,
 		PrevPostId: originalList.PrevPostId,
+		HasNext:    originalList.HasNext,
 	}

 	for id, originalPost := range originalList.Posts {
--- a/model/client4.go
+++ b/model/client4.go
@@ -3748,6 +3748,49 @@ func (c *Client4) GetPostThread(postId string, etag string, collapsedThreads boo
 	return &list, BuildResponse(r), nil
 }

+// GetPostThreadWithOpts gets a post with all the other posts in the same thread.
+func (c *Client4) GetPostThreadWithOpts(postID string, etag string, opts GetPostsOptions) (*PostList, *Response, error) {
+	urlVal := c.postRoute(postID) + "/thread"
+
+	values := url.Values{}
+	if opts.CollapsedThreads {
+		values.Set("collapsedThreads", "true")
+	}
+	if opts.CollapsedThreadsExtended {
+		values.Set("collapsedThreadsExtended", "true")
+	}
+	if opts.SkipFetchThreads {
+		values.Set("skipFetchThreads", "true")
+	}
+	if opts.PerPage != 0 {
+		values.Set("perPage", strconv.Itoa(opts.PerPage))
+	}
+	if opts.FromPost != "" {
+		values.Set("fromPost", opts.FromPost)
+	}
+	if opts.FromCreateAt != 0 {
+		values.Set("fromCreateAt", strconv.FormatInt(opts.FromCreateAt, 10))
+	}
+	if opts.Direction != "" {
+		values.Set("direction", opts.Direction)
+	}
+	urlVal += "?" + values.Encode()
+
+	r, err := c.DoAPIGet(urlVal, etag)
+	if err != nil {
+		return nil, BuildResponse(r), err
+	}
+	defer closeBody(r)
+	var list PostList
+	if r.StatusCode == http.StatusNotModified {
+		return &list, BuildResponse(r), nil
+	}
+	if jsonErr := json.NewDecoder(r.Body).Decode(&list); jsonErr != nil {
+		return nil, nil, NewAppError("GetPostThread", "api.unmarshal_error", nil, jsonErr.Error(), http.StatusInternalServerError)
+	}
+	return &list, BuildResponse(r), nil
+}
+
 // GetPostsForChannel gets a page of posts with an array for ordering for a channel.
 func (c *Client4) GetPostsForChannel(channelId string, page, perPage int, etag string, collapsedThreads bool) (*PostList, *Response, error) {
 	query := fmt.Sprintf("?page=%v&per_page=%v", page, perPage)
--- a/model/post.go
+++ b/model/post.go
@@ -263,6 +263,9 @@ type GetPostsOptions struct {
 	SkipFetchThreads         bool
 	CollapsedThreads         bool
 	CollapsedThreadsExtended bool
+	FromPost                 string // PostId after which to send the items
+	FromCreateAt             int64  // CreateAt after which to send the items
+	Direction                string // Only accepts up|down. Indicates the order in which to send the items.
 }

 func (o *Post) Etag() string {
--- a/model/post_list.go
+++ b/model/post_list.go
@@ -14,6 +14,8 @@ type PostList struct {
 	Posts      map[string]*Post `json:"posts"`
 	NextPostId string           `json:"next_post_id"`
 	PrevPostId string           `json:"prev_post_id"`
+	// HasNext indicates whether there are more items to be fetched or not.
+	HasNext bool `json:"has_next"`
 }

 func NewPostList() *PostList {
@@ -39,6 +41,7 @@ func (o *PostList) Clone() *PostList {
 		Posts:      postsCopy,
 		NextPostId: o.NextPostId,
 		PrevPostId: o.PrevPostId,
+		HasNext:    o.HasNext,
 	}
 }

--- a/services/sharedchannel/permalink.go
+++ b/services/sharedchannel/permalink.go
@@ -31,7 +31,10 @@ func (scs *Service) processPermalinkToRemote(p *model.Post) string {
 		// Extract the postID (This is simple enough not to warrant full-blown URL parsing.)
 		lastSlash := strings.LastIndexByte(msg, '/')
 		postID := msg[lastSlash+1:]
-		postList, err := scs.server.GetStore().Post().Get(context.Background(), postID, true, false, false, "")
+		opts := model.GetPostsOptions{
+			SkipFetchThreads: true,
+		}
+		postList, err := scs.server.GetStore().Post().Get(context.Background(), postID, opts, "")
 		if err != nil {
 			scs.server.GetLogger().Log(mlog.LvlSharedChannelServiceWarn, "Unable to get post during replacing permalinks", mlog.Err(err))
 			return msg
--- a/services/sharedchannel/permalink_test.go
+++ b/services/sharedchannel/permalink_test.go
@@ -27,7 +27,7 @@ func TestProcessPermalinkToRemote(t *testing.T) {
 	utils.TranslationsPreInit()

 	pl := &model.PostList{}
-	mockPostStore.On("Get", context.Background(), "postID", true, false, false, "").Return(pl, nil)
+	mockPostStore.On("Get", context.Background(), "postID", model.GetPostsOptions{SkipFetchThreads: true}, "").Return(pl, nil)

 	mockStore.On("Post").Return(&mockPostStore)

--- a/store/opentracinglayer/opentracinglayer.go
+++ b/store/opentracinglayer/opentracinglayer.go
@@ -5396,7 +5396,7 @@ func (s *OpenTracingLayerPostStore) DeleteOrphanedRows(limit int) (int64, error)
 	return result, err
 }

-func (s *OpenTracingLayerPostStore) Get(ctx context.Context, id string, skipFetchThreads bool, collapsedThreads bool, collapsedThreadsExtended bool, userID string) (*model.PostList, error) {
+func (s *OpenTracingLayerPostStore) Get(ctx context.Context, id string, opts model.GetPostsOptions, userID string) (*model.PostList, error) {
 	origCtx := s.Root.Store.Context()
 	span, newCtx := tracing.StartSpanWithParentByContext(s.Root.Store.Context(), "PostStore.Get")
 	s.Root.Store.SetContext(newCtx)
@@ -5405,7 +5405,7 @@ func (s *OpenTracingLayerPostStore) Get(ctx context.Context, id string, skipFetc
 	}()

 	defer span.Finish()
-	result, err := s.PostStore.Get(ctx, id, skipFetchThreads, collapsedThreads, collapsedThreadsExtended, userID)
+	result, err := s.PostStore.Get(ctx, id, opts, userID)
 	if err != nil {
 		span.LogFields(spanlog.Error(err))
 		ext.Error.Set(span, true)
--- a/store/retrylayer/retrylayer.go
+++ b/store/retrylayer/retrylayer.go
@@ -6121,11 +6121,11 @@ func (s *RetryLayerPostStore) DeleteOrphanedRows(limit int) (int64, error) {

 }

-func (s *RetryLayerPostStore) Get(ctx context.Context, id string, skipFetchThreads bool, collapsedThreads bool, collapsedThreadsExtended bool, userID string) (*model.PostList, error) {
+func (s *RetryLayerPostStore) Get(ctx context.Context, id string, opts model.GetPostsOptions, userID string) (*model.PostList, error) {

 	tries := 0
 	for {
-		result, err := s.PostStore.Get(ctx, id, skipFetchThreads, collapsedThreads, collapsedThreadsExtended, userID)
+		result, err := s.PostStore.Get(ctx, id, opts, userID)
 		if err == nil {
 			return result, nil
 		}
--- a/store/searchlayer/post_layer.go
+++ b/store/searchlayer/post_layer.go
@@ -110,7 +110,10 @@ func (s SearchPostStore) Delete(postId string, date int64, deletedByID string) e
 	err := s.PostStore.Delete(postId, date, deletedByID)

 	if err == nil {
-		postList, err2 := s.PostStore.Get(context.Background(), postId, true, false, false, "")
+		opts := model.GetPostsOptions{
+			SkipFetchThreads: true,
+		}
+		postList, err2 := s.PostStore.Get(context.Background(), postId, opts, "")
 		if postList != nil && len(postList.Order) > 0 {
 			if err2 != nil {
 				s.deletePostIndex(postList.Posts[postList.Order[0]])
--- a/store/sqlstore/post_store.go
+++ b/store/sqlstore/post_store.go
@@ -547,7 +547,7 @@ func (s *SqlPostStore) buildFlaggedPostChannelFilterClause(channelId string, que
 	return "AND ChannelId = ?", append(queryParams, channelId)
 }

-func (s *SqlPostStore) getPostWithCollapsedThreads(id, userID string, extended bool) (*model.PostList, error) {
+func (s *SqlPostStore) getPostWithCollapsedThreads(id, userID string, opts model.GetPostsOptions) (*model.PostList, error) {
 	if id == "" {
 		return nil, store.NewErrInvalidInput("Post", "id", id)
 	}
@@ -582,12 +582,71 @@ func (s *SqlPostStore) getPostWithCollapsedThreads(id, userID string, extended b
 	}

 	posts := []*model.Post{}
-	err = s.GetReplicaX().Select(&posts, "SELECT * FROM Posts WHERE Posts.RootId = ? AND DeleteAt = 0", id)
+	query := s.getQueryBuilder().
+		Select("*").
+		From("Posts").
+		Where(sq.Eq{
+			"RootId":   id,
+			"DeleteAt": 0,
+		})
+
+	var sort string
+	if opts.Direction != "" {
+		if opts.Direction == "up" {
+			sort = "DESC"
+		} else if opts.Direction == "down" {
+			sort = "ASC"
+		}
+	}
+	if sort != "" {
+		query = query.OrderBy("CreateAt " + sort + ", Id " + sort)
+	}
+
+	if opts.FromPost != "" && opts.FromCreateAt != 0 {
+		if opts.Direction == "down" {
+			query = query.Where(sq.Or{
+				sq.Gt{"Posts.CreateAt": opts.FromCreateAt},
+				sq.And{
+					sq.Eq{"Posts.CreateAt": opts.FromCreateAt},
+					sq.Gt{"Posts.Id": opts.FromPost},
+				},
+			})
+		} else {
+			query = query.Where(sq.Or{
+				sq.Lt{"Posts.CreateAt": opts.FromCreateAt},
+				sq.And{
+					sq.Eq{"Posts.CreateAt": opts.FromCreateAt},
+					sq.Lt{"Posts.Id": opts.FromPost},
+				},
+			})
+		}
+	}
+
+	if opts.PerPage != 0 {
+		query = query.Limit(uint64(opts.PerPage + 1))
+	}
+
+	sql, args, err := query.ToSql()
+	if err != nil {
+		return nil, errors.Wrap(err, "getPostWithCollapsedThreads_Tosql")
+	}
+	err = s.GetReplicaX().Select(&posts, sql, args...)
 	if err != nil {
 		return nil, errors.Wrapf(err, "failed to find Posts for thread %s", id)
 	}

-	list, err := s.prepareThreadedResponse([]*postWithExtra{&post}, extended, false)
+	var hasNext bool
+	if opts.PerPage != 0 {
+		if len(posts) == opts.PerPage+1 {
+			hasNext = true
+		}
+	}
+	if hasNext {
+		// Shave off the last item.
+		posts = posts[:len(posts)-1]
+	}
+
+	list, err := s.prepareThreadedResponse([]*postWithExtra{&post}, opts.CollapsedThreadsExtended, false)
 	if err != nil {
 		return nil, err
 	}
@@ -595,12 +654,14 @@ func (s *SqlPostStore) getPostWithCollapsedThreads(id, userID string, extended b
 		list.AddPost(p)
 		list.AddOrder(p.Id)
 	}
+	list.HasNext = hasNext
+
 	return list, nil
 }

-func (s *SqlPostStore) Get(ctx context.Context, id string, skipFetchThreads, collapsedThreads, collapsedThreadsExtended bool, userID string) (*model.PostList, error) {
-	if collapsedThreads {
-		return s.getPostWithCollapsedThreads(id, userID, collapsedThreadsExtended)
+func (s *SqlPostStore) Get(ctx context.Context, id string, opts model.GetPostsOptions, userID string) (*model.PostList, error) {
+	if opts.CollapsedThreads {
+		return s.getPostWithCollapsedThreads(id, userID, opts)
 	}
 	pl := model.NewPostList()

@@ -620,7 +681,7 @@ func (s *SqlPostStore) Get(ctx context.Context, id string, skipFetchThreads, col
 	}
 	pl.AddPost(&post)
 	pl.AddOrder(id)
-	if !skipFetchThreads {
+	if !opts.SkipFetchThreads {
 		rootId := post.RootId

 		if rootId == "" {
@@ -631,16 +692,78 @@ func (s *SqlPostStore) Get(ctx context.Context, id string, skipFetchThreads, col
 			return nil, errors.Wrapf(err, "invalid rootId with value=%s", rootId)
 		}

+		query := s.getQueryBuilder().
+			Select("p.*, (SELECT count(*) FROM Posts WHERE Posts.RootId = (CASE WHEN p.RootId = '' THEN p.Id ELSE p.RootId END) AND Posts.DeleteAt = 0) as ReplyCount").
+			From("Posts p").
+			Where(sq.Or{
+				sq.Eq{"p.Id": rootId},
+				sq.Eq{"p.RootId": rootId},
+			}).
+			Where(sq.Eq{"p.DeleteAt": 0})
+
+		var sort string
+		if opts.Direction != "" {
+			if opts.Direction == "up" {
+				sort = "DESC"
+			} else if opts.Direction == "down" {
+				sort = "ASC"
+			}
+		}
+		if sort != "" {
+			query = query.OrderBy("CreateAt " + sort + ", Id " + sort)
+		}
+
+		if opts.FromPost != "" && opts.FromCreateAt != 0 {
+			if opts.Direction == "down" {
+				query = query.Where(sq.Or{
+					sq.Gt{"p.CreateAt": opts.FromCreateAt},
+					sq.And{
+						sq.Eq{"p.CreateAt": opts.FromCreateAt},
+						sq.Gt{"p.Id": opts.FromPost},
+					},
+				})
+			} else {
+				query = query.Where(sq.Or{
+					sq.Lt{"p.CreateAt": opts.FromCreateAt},
+					sq.And{
+						sq.Eq{"p.CreateAt": opts.FromCreateAt},
+						sq.Lt{"p.Id": opts.FromPost},
+					},
+				})
+			}
+		}
+
+		if opts.PerPage != 0 {
+			query = query.Limit(uint64(opts.PerPage + 1))
+		}
+
+		sql, args, err := query.ToSql()
+		if err != nil {
+			return nil, errors.Wrap(err, "Get_Tosql")
+		}
+
 		posts := []*model.Post{}
-		err = s.GetReplicaX().Select(&posts, "SELECT *, (SELECT count(*) FROM Posts WHERE Posts.RootId = (CASE WHEN p.RootId = '' THEN p.Id ELSE p.RootId END) AND Posts.DeleteAt = 0) as ReplyCount FROM Posts p WHERE (Id = ? OR RootId = ?) AND DeleteAt = 0", rootId, rootId)
+		err = s.GetReplicaX().Select(&posts, sql, args...)
 		if err != nil {
 			return nil, errors.Wrap(err, "failed to find Posts")
 		}

+		var hasNext bool
+		if opts.PerPage != 0 {
+			if len(posts) == opts.PerPage+1 {
+				hasNext = true
+			}
+		}
+		if hasNext {
+			// Shave off the last item
+			posts = posts[:len(posts)-1]
+		}
+
 		for _, p := range posts {
 			pl.AddPost(p)
 			pl.AddOrder(p.Id)
 		}
+		pl.HasNext = hasNext
 	}
 	return pl, nil
 }
--- a/store/store.go
+++ b/store/store.go
@@ -322,7 +322,7 @@ type PostStore interface {
 	SaveMultiple(posts []*model.Post) ([]*model.Post, int, error)
 	Save(post *model.Post) (*model.Post, error)
 	Update(newPost *model.Post, oldPost *model.Post) (*model.Post, error)
-	Get(ctx context.Context, id string, skipFetchThreads, collapsedThreads, collapsedThreadsExtended bool, userID string) (*model.PostList, error)
+	Get(ctx context.Context, id string, opts model.GetPostsOptions, userID string) (*model.PostList, error)
 	GetSingle(id string, inclDeleted bool) (*model.Post, error)
 	Delete(postID string, time int64, deleteByID string) error
 	PermanentDeleteByUser(userID string) error
--- a/store/storetest/mocks/PostStore.go
+++ b/store/storetest/mocks/PostStore.go
@@ -123,13 +123,13 @@ func (_m *PostStore) DeleteOrphanedRows(limit int) (int64, error) {
 	return r0, r1
 }

-// Get provides a mock function with given fields: ctx, id, skipFetchThreads, collapsedThreads, collapsedThreadsExtended, userID
-func (_m *PostStore) Get(ctx context.Context, id string, skipFetchThreads bool, collapsedThreads bool, collapsedThreadsExtended bool, userID string) (*model.PostList, error) {
-	ret := _m.Called(ctx, id, skipFetchThreads, collapsedThreads, collapsedThreadsExtended, userID)
+// Get provides a mock function with given fields: ctx, id, opts, userID
+func (_m *PostStore) Get(ctx context.Context, id string, opts model.GetPostsOptions, userID string) (*model.PostList, error) {
+	ret := _m.Called(ctx, id, opts, userID)

 	var r0 *model.PostList
-	if rf, ok := ret.Get(0).(func(context.Context, string, bool, bool, bool, string) *model.PostList); ok {
-		r0 = rf(ctx, id, skipFetchThreads, collapsedThreads, collapsedThreadsExtended, userID)
+	if rf, ok := ret.Get(0).(func(context.Context, string, model.GetPostsOptions, string) *model.PostList); ok {
+		r0 = rf(ctx, id, opts, userID)
 	} else {
 		if ret.Get(0) != nil {
 			r0 = ret.Get(0).(*model.PostList)
@@ -137,8 +137,8 @@ func (_m *PostStore) Get(ctx context.Context, id string, skipFetchThreads bool,
 	}

 	var r1 error
-	if rf, ok := ret.Get(1).(func(context.Context, string, bool, bool, bool, string) error); ok {
-		r1 = rf(ctx, id, skipFetchThreads, collapsedThreads, collapsedThreadsExtended, userID)
+	if rf, ok := ret.Get(1).(func(context.Context, string, model.GetPostsOptions, string) error); ok {
+		r1 = rf(ctx, id, opts, userID)
 	} else {
 		r1 = ret.Error(1)
 	}
--- a/store/storetest/post_store.go
+++ b/store/storetest/post_store.go
@@ -491,14 +491,14 @@ func testPostStoreGet(t *testing.T, ss store.Store) {
 	etag2 := ss.Post().GetEtag(o1.ChannelId, false, false)
 	require.Equal(t, 0, strings.Index(etag2, fmt.Sprintf("%v.%v", model.CurrentVersion, o1.UpdateAt)), "Invalid Etag")

-	r1, err := ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	r1, err := ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	require.Equal(t, r1.Posts[o1.Id].CreateAt, o1.CreateAt, "invalid returned post")

-	_, err = ss.Post().Get(context.Background(), "123", false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), "123", model.GetPostsOptions{}, "")
 	require.Error(t, err, "Missing id should have failed")

-	_, err = ss.Post().Get(context.Background(), "", false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), "", model.GetPostsOptions{}, "")
 	require.Error(t, err, "should fail for blank post ids")
 }

@@ -515,7 +515,10 @@ func testPostStoreGetForThread(t *testing.T, ss store.Store) {
 			UpdateFollowing: true,
 		})
 		require.NoError(t, err)
-		r1, err := ss.Post().Get(context.Background(), o1.Id, false, true, false, o1.UserId)
+		opts := model.GetPostsOptions{
+			CollapsedThreads: true,
+		}
+		r1, err := ss.Post().Get(context.Background(), o1.Id, opts, o1.UserId)
 		require.NoError(t, err)
 		require.Equal(t, r1.Posts[o1.Id].CreateAt, o1.CreateAt, "invalid returned post")
 		require.True(t, *r1.Posts[o1.Id].IsFollowing)
@@ -533,7 +536,10 @@ func testPostStoreGetForThread(t *testing.T, ss store.Store) {
 			UpdateFollowing: true,
 		})
 		require.NoError(t, err)
-		r1, err := ss.Post().Get(context.Background(), o1.Id, false, true, false, o1.UserId)
+		opts := model.GetPostsOptions{
+			CollapsedThreads: true,
+		}
+		r1, err := ss.Post().Get(context.Background(), o1.Id, opts, o1.UserId)
 		require.NoError(t, err)
 		require.Equal(t, r1.Posts[o1.Id].CreateAt, o1.CreateAt, "invalid returned post")
 		require.False(t, *r1.Posts[o1.Id].IsFollowing)
@@ -546,11 +552,113 @@ func testPostStoreGetForThread(t *testing.T, ss store.Store) {
 		_, err = ss.Post().Save(&model.Post{ChannelId: o1.ChannelId, UserId: model.NewId(), Message: NewTestId(), RootId: o1.Id})
 		require.NoError(t, err)

-		r1, err := ss.Post().Get(context.Background(), o1.Id, false, true, false, o1.UserId)
+		opts := model.GetPostsOptions{
+			CollapsedThreads: true,
+		}
+		r1, err := ss.Post().Get(context.Background(), o1.Id, opts, o1.UserId)
 		require.NoError(t, err)
 		require.Equal(t, r1.Posts[o1.Id].CreateAt, o1.CreateAt, "invalid returned post")
 		require.Nil(t, r1.Posts[o1.Id].IsFollowing)
 	})
+
+	t.Run("Pagination", func(t *testing.T) {
+		o1, err := ss.Post().Save(&model.Post{ChannelId: model.NewId(), UserId: model.NewId(), Message: NewTestId()})
+		require.NoError(t, err)
+		_, err = ss.Post().Save(&model.Post{ChannelId: o1.ChannelId, UserId: model.NewId(), Message: NewTestId(), RootId: o1.Id})
+		require.NoError(t, err)
+		_, err = ss.Post().Save(&model.Post{ChannelId: o1.ChannelId, UserId: model.NewId(), Message: NewTestId(), RootId: o1.Id})
+		require.NoError(t, err)
+		_, err = ss.Post().Save(&model.Post{ChannelId: o1.ChannelId, UserId: model.NewId(), Message: NewTestId(), RootId: o1.Id})
+		require.NoError(t, err)
+		_, err = ss.Post().Save(&model.Post{ChannelId: o1.ChannelId, UserId: model.NewId(), Message: NewTestId(), RootId: o1.Id})
+		require.NoError(t, err)
+
+		opts := model.GetPostsOptions{
+			CollapsedThreads: true,
+			PerPage:          2,
+			Direction:        "down",
+		}
+		r1, err := ss.Post().Get(context.Background(), o1.Id, opts, o1.UserId)
+		require.NoError(t, err)
+		assert.Len(t, r1.Order, 3) // including the root post
+		assert.True(t, r1.HasNext)
+
+		lastPostID := r1.Order[len(r1.Order)-1]
+		lastPostCreateAt := r1.Posts[lastPostID].CreateAt
+
+		opts = model.GetPostsOptions{
+			CollapsedThreads: true,
+			PerPage:          2,
+			Direction:        "down",
+			FromPost:         lastPostID,
+			FromCreateAt:     lastPostCreateAt,
+		}
+		r1, err = ss.Post().Get(context.Background(), o1.Id, opts, o1.UserId)
+		require.NoError(t, err)
+		assert.Len(t, r1.Order, 3) // including the root post
+		assert.GreaterOrEqual(t, r1.Posts[r1.Order[len(r1.Order)-1]].CreateAt, lastPostCreateAt)
+		assert.False(t, r1.HasNext)
+
+		// Going from bottom to top now.
+		firstPostCreateAt := r1.Posts[r1.Order[1]].CreateAt
+		opts = model.GetPostsOptions{
+			CollapsedThreads: true,
+			PerPage:          2,
+			Direction:        "up",
+			FromPost:         r1.Order[1],
+			FromCreateAt:     firstPostCreateAt,
+		}
+		r1, err = ss.Post().Get(context.Background(), o1.Id, opts, o1.UserId)
+		require.NoError(t, err)
+		assert.Len(t, r1.Order, 3) // including the root post
+		assert.LessOrEqual(t, r1.Posts[r1.Order[1]].CreateAt, firstPostCreateAt)
+		assert.False(t, r1.HasNext)
+
+		// Non-CRT mode
+		opts = model.GetPostsOptions{
+			CollapsedThreads: false,
+			PerPage:          2,
+			Direction:        "down",
+			SkipFetchThreads: false,
+		}
+		r1, err = ss.Post().Get(context.Background(), o1.Id, opts, o1.UserId)
+		require.NoError(t, err)
+		assert.Len(t, r1.Order, 3) // including the root post
+		assert.True(t, r1.HasNext)
+
+		lastPostID = r1.Order[len(r1.Order)-1]
+		lastPostCreateAt = r1.Posts[lastPostID].CreateAt
+
+		opts = model.GetPostsOptions{
+			CollapsedThreads: false,
+			PerPage:          3,
+			Direction:        "down",
+			FromPost:         lastPostID,
+			FromCreateAt:     lastPostCreateAt,
+			SkipFetchThreads: false,
+		}
+		r1, err = ss.Post().Get(context.Background(), o1.Id, opts, o1.UserId)
+		require.NoError(t, err)
+		assert.Len(t, r1.Order, 4) // including the root post
+		assert.GreaterOrEqual(t, r1.Posts[r1.Order[len(r1.Order)-1]].CreateAt, lastPostCreateAt)
+		assert.False(t, r1.HasNext)
+
+		// Going from bottom to top now.
+		firstPostCreateAt = r1.Posts[r1.Order[1]].CreateAt
+		opts = model.GetPostsOptions{
+			CollapsedThreads: false,
+			PerPage:          2,
+			Direction:        "up",
+			FromPost:         r1.Order[1],
+			FromCreateAt:     firstPostCreateAt,
+			SkipFetchThreads: false,
+		}
+		r1, err = ss.Post().Get(context.Background(), o1.Id, opts, o1.UserId)
+		require.NoError(t, err)
+		assert.Len(t, r1.Order, 3) // including the root post
+		assert.LessOrEqual(t, r1.Posts[r1.Order[1]].CreateAt, firstPostCreateAt)
+		assert.False(t, r1.HasNext)
+	})
 }

 func testPostStoreGetSingle(t *testing.T, ss store.Store) {
@@ -635,15 +743,15 @@ func testPostStoreUpdate(t *testing.T, ss store.Store) {
 	o3, err = ss.Post().Save(o3)
 	require.NoError(t, err)

-	r1, err := ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	r1, err := ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro1 := r1.Posts[o1.Id]

-	r2, err := ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	r2, err := ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro2 := r2.Posts[o2.Id]

-	r3, err := ss.Post().Get(context.Background(), o3.Id, false, false, false, "")
+	r3, err := ss.Post().Get(context.Background(), o3.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro3 := r3.Posts[o3.Id]

@@ -654,7 +762,7 @@ func testPostStoreUpdate(t *testing.T, ss store.Store) {
 	_, err = ss.Post().Update(o1a, ro1)
 	require.NoError(t, err)

-	r1, err = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	r1, err = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)

 	ro1a := r1.Posts[o1.Id]
@@ -665,7 +773,7 @@ func testPostStoreUpdate(t *testing.T, ss store.Store) {
 	_, err = ss.Post().Update(o2a, ro2)
 	require.NoError(t, err)

-	r2, err = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	r2, err = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro2a := r2.Posts[o2.Id]

@@ -676,7 +784,7 @@ func testPostStoreUpdate(t *testing.T, ss store.Store) {
 	_, err = ss.Post().Update(o3a, ro3)
 	require.NoError(t, err)

-	r3, err = ss.Post().Get(context.Background(), o3.Id, false, false, false, "")
+	r3, err = ss.Post().Get(context.Background(), o3.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro3a := r3.Posts[o3.Id]

@@ -692,7 +800,7 @@ func testPostStoreUpdate(t *testing.T, ss store.Store) {
 	})
 	require.NoError(t, err)

-	r4, err := ss.Post().Get(context.Background(), o4.Id, false, false, false, "")
+	r4, err := ss.Post().Get(context.Background(), o4.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro4 := r4.Posts[o4.Id]

@@ -702,7 +810,7 @@ func testPostStoreUpdate(t *testing.T, ss store.Store) {
 	_, err = ss.Post().Update(o4a, ro4)
 	require.NoError(t, err)

-	r4, err = ss.Post().Get(context.Background(), o4.Id, false, false, false, "")
+	r4, err = ss.Post().Get(context.Background(), o4.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)

 	ro4a := r4.Posts[o4.Id]
@@ -723,7 +831,7 @@ func testPostStoreDelete(t *testing.T, ss store.Store) {
 	o1, err := ss.Post().Save(o1)
 	require.NoError(t, err)

-	r1, err := ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	r1, err := ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	require.Equal(t, r1.Posts[o1.Id].CreateAt, o1.CreateAt, "invalid returned post")

@@ -736,7 +844,7 @@ func testPostStoreDelete(t *testing.T, ss store.Store) {

 	assert.Equal(t, deleteByID, actual, "Expected (*Post).Props[model.PostPropsDeleteBy] to be %v but got %v.", deleteByID, actual)

-	r3, err := ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	r3, err := ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Missing id should have failed - PostList %v", r3)

 	etag2 := ss.Post().GetEtag(o1.ChannelId, false, false)
@@ -762,10 +870,10 @@ func testPostStoreDelete1Level(t *testing.T, ss store.Store) {
 	err = ss.Post().Delete(o1.Id, model.GetMillis(), "")
 	require.NoError(t, err)

-	_, err = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")

-	_, err = ss.Post().Get(context.Background(), o2.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o2.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")
 }

@@ -803,16 +911,16 @@ func testPostStoreDelete2Level(t *testing.T, ss store.Store) {
 	err = ss.Post().Delete(o1.Id, model.GetMillis(), "")
 	require.NoError(t, err)

-	_, err = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")

-	_, err = ss.Post().Get(context.Background(), o2.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o2.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")

-	_, err = ss.Post().Get(context.Background(), o3.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o3.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")

-	_, err = ss.Post().Get(context.Background(), o4.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o4.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 }

@@ -878,10 +986,10 @@ func testPostStorePermDelete1Level(t *testing.T, ss store.Store) {
 	require.EqualValues(t, 0, thread.ReplyCount)
 	require.EqualValues(t, model.StringArray{}, thread.Participants)

-	_, err = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err, "Deleted id shouldn't have failed")

-	_, err = ss.Post().Get(context.Background(), o2.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o2.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")

 	thread, err = ss.Thread().Get(o5.Id)
@@ -895,16 +1003,16 @@ func testPostStorePermDelete1Level(t *testing.T, ss store.Store) {
 	require.NoError(t, err)
 	require.Nil(t, thread)

-	_, err = ss.Post().Get(context.Background(), o3.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o3.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")

-	_, err = ss.Post().Get(context.Background(), o4.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o4.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")

-	_, err = ss.Post().Get(context.Background(), o5.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o5.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")

-	_, err = ss.Post().Get(context.Background(), o6.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o6.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")
 }

@@ -934,13 +1042,13 @@ func testPostStorePermDelete1Level2(t *testing.T, ss store.Store) {
 	err2 := ss.Post().PermanentDeleteByUser(o1.UserId)
 	require.NoError(t, err2)

-	_, err = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")

-	_, err = ss.Post().Get(context.Background(), o2.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o2.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Deleted id should have failed")

-	_, err = ss.Post().Get(context.Background(), o3.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o3.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err, "Deleted id should have failed")
 }

@@ -968,7 +1076,7 @@ func testPostStoreGetWithChildren(t *testing.T, ss store.Store) {
 	o3, err = ss.Post().Save(o3)
 	require.NoError(t, err)

-	pl, err := ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	pl, err := ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)

 	require.Len(t, pl.Posts, 3, "invalid returned post")
@@ -976,7 +1084,7 @@ func testPostStoreGetWithChildren(t *testing.T, ss store.Store) {
 	dErr := ss.Post().Delete(o3.Id, model.GetMillis(), "")
 	require.NoError(t, dErr)

-	pl, err = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	pl, err = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)

 	require.Len(t, pl.Posts, 2, "invalid returned post")
@@ -984,7 +1092,7 @@ func testPostStoreGetWithChildren(t *testing.T, ss store.Store) {
 	dErr = ss.Post().Delete(o2.Id, model.GetMillis(), "")
 	require.NoError(t, dErr)

-	pl, err = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	pl, err = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)

 	require.Len(t, pl.Posts, 1, "invalid returned post")
@@ -2579,23 +2687,23 @@ func testPostStoreOverwriteMultiple(t *testing.T, ss store.Store) {
 	})
 	require.NoError(t, err)

-	r1, err := ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	r1, err := ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro1 := r1.Posts[o1.Id]

-	r2, err := ss.Post().Get(context.Background(), o2.Id, false, false, false, "")
+	r2, err := ss.Post().Get(context.Background(), o2.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro2 := r2.Posts[o2.Id]

-	r3, err := ss.Post().Get(context.Background(), o3.Id, false, false, false, "")
+	r3, err := ss.Post().Get(context.Background(), o3.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro3 := r3.Posts[o3.Id]

-	r4, err := ss.Post().Get(context.Background(), o4.Id, false, false, false, "")
+	r4, err := ss.Post().Get(context.Background(), o4.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro4 := r4.Posts[o4.Id]

-	r5, err := ss.Post().Get(context.Background(), o5.Id, false, false, false, "")
+	r5, err := ss.Post().Get(context.Background(), o5.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro5 := r5.Posts[o5.Id]

@@ -2621,15 +2729,15 @@ func testPostStoreOverwriteMultiple(t *testing.T, ss store.Store) {
 		require.NoError(t, err)
 		require.Equal(t, -1, errIdx)

-		r1, nErr := ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+		r1, nErr := ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, nErr)
 		ro1a := r1.Posts[o1.Id]

-		r2, nErr = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+		r2, nErr = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, nErr)
 		ro2a := r2.Posts[o2.Id]

-		r3, nErr = ss.Post().Get(context.Background(), o3.Id, false, false, false, "")
+		r3, nErr = ss.Post().Get(context.Background(), o3.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, nErr)
 		ro3a := r3.Posts[o3.Id]

@@ -2651,11 +2759,11 @@ func testPostStoreOverwriteMultiple(t *testing.T, ss store.Store) {
 		require.NoError(t, err)
 		require.Equal(t, -1, errIdx)

-		r4, nErr := ss.Post().Get(context.Background(), o4.Id, false, false, false, "")
+		r4, nErr := ss.Post().Get(context.Background(), o4.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, nErr)
 		ro4a := r4.Posts[o4.Id]

-		r5, nErr = ss.Post().Get(context.Background(), o5.Id, false, false, false, "")
+		r5, nErr = ss.Post().Get(context.Background(), o5.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, nErr)
 		ro5a := r5.Posts[o5.Id]

@@ -2697,19 +2805,19 @@ func testPostStoreOverwrite(t *testing.T, ss store.Store) {
 	})
 	require.NoError(t, err)

-	r1, err := ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	r1, err := ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro1 := r1.Posts[o1.Id]

-	r2, err := ss.Post().Get(context.Background(), o2.Id, false, false, false, "")
+	r2, err := ss.Post().Get(context.Background(), o2.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro2 := r2.Posts[o2.Id]

-	r3, err := ss.Post().Get(context.Background(), o3.Id, false, false, false, "")
+	r3, err := ss.Post().Get(context.Background(), o3.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro3 := r3.Posts[o3.Id]

-	r4, err := ss.Post().Get(context.Background(), o4.Id, false, false, false, "")
+	r4, err := ss.Post().Get(context.Background(), o4.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro4 := r4.Posts[o4.Id]

@@ -2734,15 +2842,15 @@ func testPostStoreOverwrite(t *testing.T, ss store.Store) {
 		_, err = ss.Post().Overwrite(o3a)
 		require.NoError(t, err)

-		r1, err = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+		r1, err = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, err)
 		ro1a := r1.Posts[o1.Id]

-		r2, err = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+		r2, err = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, err)
 		ro2a := r2.Posts[o2.Id]

-		r3, err = ss.Post().Get(context.Background(), o3.Id, false, false, false, "")
+		r3, err = ss.Post().Get(context.Background(), o3.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, err)
 		ro3a := r3.Posts[o3.Id]

@@ -2758,7 +2866,7 @@ func testPostStoreOverwrite(t *testing.T, ss store.Store) {
 		_, err = ss.Post().Overwrite(o4a)
 		require.NoError(t, err)

-		r4, err = ss.Post().Get(context.Background(), o4.Id, false, false, false, "")
+		r4, err = ss.Post().Get(context.Background(), o4.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, err)

 		ro4a := r4.Posts[o4.Id]
@@ -2789,15 +2897,15 @@ func testPostStoreGetPostsByIds(t *testing.T, ss store.Store) {
 	o3, err = ss.Post().Save(o3)
 	require.NoError(t, err)

-	r1, err := ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	r1, err := ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro1 := r1.Posts[o1.Id]

-	r2, err := ss.Post().Get(context.Background(), o2.Id, false, false, false, "")
+	r2, err := ss.Post().Get(context.Background(), o2.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro2 := r2.Posts[o2.Id]

-	r3, err := ss.Post().Get(context.Background(), o3.Id, false, false, false, "")
+	r3, err := ss.Post().Get(context.Background(), o3.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	ro3 := r3.Posts[o3.Id]

@@ -2918,13 +3026,13 @@ func testPostStorePermanentDeleteBatch(t *testing.T, ss store.Store) {
 	_, _, err = ss.Post().PermanentDeleteBatchForRetentionPolicies(0, 2000, 1000, model.RetentionPolicyCursor{})
 	require.NoError(t, err)

-	_, err = ss.Post().Get(context.Background(), o1.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o1.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Should have not found post 1 after purge")

-	_, err = ss.Post().Get(context.Background(), o2.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o2.Id, model.GetPostsOptions{}, "")
 	require.Error(t, err, "Should have not found post 2 after purge")

-	_, err = ss.Post().Get(context.Background(), o3.Id, false, false, false, "")
+	_, err = ss.Post().Get(context.Background(), o3.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err, "Should have found post 3 after purge")

 	t.Run("with pagination", func(t *testing.T) {
@@ -2968,13 +3076,13 @@ func testPostStorePermanentDeleteBatch(t *testing.T, ss store.Store) {

 		_, _, err2 = ss.Post().PermanentDeleteBatchForRetentionPolicies(0, 2000, 1000, model.RetentionPolicyCursor{})
 		require.NoError(t, err2)
-		_, err2 = ss.Post().Get(context.Background(), post.Id, false, false, false, "")
+		_, err2 = ss.Post().Get(context.Background(), post.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, err2, "global policy should have been ignored due to granular policy")

 		nowMillis := post.CreateAt + *channelPolicy.PostDuration*24*60*60*1000 + 1
 		_, _, err2 = ss.Post().PermanentDeleteBatchForRetentionPolicies(nowMillis, 0, 1000, model.RetentionPolicyCursor{})
 		require.NoError(t, err2)
-		_, err2 = ss.Post().Get(context.Background(), post.Id, false, false, false, "")
+		_, err2 = ss.Post().Get(context.Background(), post.Id, model.GetPostsOptions{}, "")
 		require.Error(t, err2, "post should have been deleted by channel policy")

 		// Create a team policy which is stricter than the channel policy
@@ -2993,7 +3101,7 @@ func testPostStorePermanentDeleteBatch(t *testing.T, ss store.Store) {
 		nowMillis = post.CreateAt + *teamPolicy.PostDuration*24*60*60*1000 + 1
 		_, _, err2 = ss.Post().PermanentDeleteBatchForRetentionPolicies(nowMillis, 0, 1000, model.RetentionPolicyCursor{})
 		require.NoError(t, err2)
-		_, err2 = ss.Post().Get(context.Background(), post.Id, false, false, false, "")
+		_, err2 = ss.Post().Get(context.Background(), post.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, err2, "channel policy should have overridden team policy")

 		// Delete channel policy and re-run team policy
@@ -3005,7 +3113,7 @@ func testPostStorePermanentDeleteBatch(t *testing.T, ss store.Store) {

 		_, _, err2 = ss.Post().PermanentDeleteBatchForRetentionPolicies(nowMillis, 0, 1000, model.RetentionPolicyCursor{})
 		require.NoError(t, err2)
-		_, err2 = ss.Post().Get(context.Background(), post.Id, false, false, false, "")
+		_, err2 = ss.Post().Get(context.Background(), post.Id, model.GetPostsOptions{}, "")
 		require.Error(t, err2, "post should have been deleted by team policy")

 		err2 = ss.RetentionPolicy().RemoveTeams(teamPolicy.ID, []string{team.Id})
--- a/store/storetest/reaction_store.go
+++ b/store/storetest/reaction_store.go
@@ -55,7 +55,7 @@ func testReactionSave(t *testing.T, ss store.Store) {
 	assert.Zero(t, saved.DeleteAt, "should've saved reaction delete_at with zero value and returned it")

 	var secondUpdateAt int64
-	postList, err := ss.Post().Get(context.Background(), reaction1.PostId, false, false, false, "")
+	postList, err := ss.Post().Get(context.Background(), reaction1.PostId, model.GetPostsOptions{}, "")
 	require.NoError(t, err)

 	assert.True(t, postList.Posts[post.Id].HasReactions, "should've set HasReactions = true on post")
@@ -79,7 +79,7 @@ func testReactionSave(t *testing.T, ss store.Store) {
 	_, nErr = ss.Reaction().Save(reaction2)
 	require.NoError(t, nErr)

-	postList, err = ss.Post().Get(context.Background(), reaction2.PostId, false, false, false, "")
+	postList, err = ss.Post().Get(context.Background(), reaction2.PostId, model.GetPostsOptions{}, "")
 	require.NoError(t, err)

 	assert.NotEqual(t, postList.Posts[post.Id].UpdateAt, secondUpdateAt, "should've marked post as updated even if HasReactions doesn't change")
@@ -129,7 +129,7 @@ func testReactionDelete(t *testing.T, ss store.Store) {
 		_, nErr := ss.Reaction().Save(reaction)
 		require.NoError(t, nErr)

-		result, err := ss.Post().Get(context.Background(), reaction.PostId, false, false, false, "")
+		result, err := ss.Post().Get(context.Background(), reaction.PostId, model.GetPostsOptions{}, "")
 		require.NoError(t, err)

 		firstUpdateAt := result.Posts[post.Id].UpdateAt
@@ -142,7 +142,7 @@ func testReactionDelete(t *testing.T, ss store.Store) {

 		assert.Empty(t, reactions, "should've deleted reaction")

-		postList, err := ss.Post().Get(context.Background(), post.Id, false, false, false, "")
+		postList, err := ss.Post().Get(context.Background(), post.Id, model.GetPostsOptions{}, "")
 		require.NoError(t, err)

 		assert.False(t, postList.Posts[post.Id].HasReactions, "should've set HasReactions = false on post")
@@ -507,15 +507,15 @@ func testReactionDeleteAllWithEmojiName(t *testing.T, ss store.Store, s SqlStore
 	assert.Empty(t, returned, "should've only removed reactions with emoji name")

 	// check that the posts are updated
-	postList, err := ss.Post().Get(context.Background(), post.Id, false, false, false, "")
+	postList, err := ss.Post().Get(context.Background(), post.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	assert.True(t, postList.Posts[post.Id].HasReactions, "post should still have reactions")

-	postList, err = ss.Post().Get(context.Background(), post2.Id, false, false, false, "")
+	postList, err = ss.Post().Get(context.Background(), post2.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	assert.True(t, postList.Posts[post2.Id].HasReactions, "post should still have reactions")

-	postList, err = ss.Post().Get(context.Background(), post3.Id, false, false, false, "")
+	postList, err = ss.Post().Get(context.Background(), post3.Id, model.GetPostsOptions{}, "")
 	require.NoError(t, err)
 	assert.False(t, postList.Posts[post3.Id].HasReactions, "post shouldn't have reactions any more")

--- a/store/storetest/thread_store.go
+++ b/store/storetest/thread_store.go
@@ -80,7 +80,10 @@ func testThreadStorePopulation(t *testing.T, ss store.Store) {

 		newPosts, errIdx, err3 := ss.Post().SaveMultiple([]*model.Post{&o2, &o3, &o4})

-		olist, _ := ss.Post().Get(context.Background(), otmp.Id, true, false, false, "")
+		opts := model.GetPostsOptions{
+			SkipFetchThreads: true,
+		}
+		olist, _ := ss.Post().Get(context.Background(), otmp.Id, opts, "")
 		o1 := olist.Posts[olist.Order[0]]

 		newPosts = append([]*model.Post{o1}, newPosts...)
--- a/store/timerlayer/timerlayer.go
+++ b/store/timerlayer/timerlayer.go
@@ -4890,10 +4890,10 @@ func (s *TimerLayerPostStore) DeleteOrphanedRows(limit int) (int64, error) {
 	return result, err
 }

-func (s *TimerLayerPostStore) Get(ctx context.Context, id string, skipFetchThreads bool, collapsedThreads bool, collapsedThreadsExtended bool, userID string) (*model.PostList, error) {
+func (s *TimerLayerPostStore) Get(ctx context.Context, id string, opts model.GetPostsOptions, userID string) (*model.PostList, error) {
 	start := timemodule.Now()

-	result, err := s.PostStore.Get(ctx, id, skipFetchThreads, collapsedThreads, collapsedThreadsExtended, userID)
+	result, err := s.PostStore.Get(ctx, id, opts, userID)

 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {