MM-27007 Remove automatic sidebar migration (#15087)

* MM-27007 Add migration of favorited channels to CreateInitialSidebarCategories

* MM-27007 Rewrite migrateFavortitesToSidebarT to use ROW_NUMBER() when available

* MM-27007 Remove automatic sidebar migration

* Remove old i18n strings

* Fix typo

* Address feedback

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/sqlstore/channel_store.go

@@ -436,46 +436,6 @@ func (s SqlChannelStore) createIndexesIfNotExists() {
 	s.CreateIndexIfNotExists("idx_channels_scheme_id", "Channels", "SchemeId")
 }
 
-// MigrateSidebarCategories creates 3 initial categories for all existing user/team pairs
-// **IMPORTANT** This function should only be called from the migration task and shouldn't be used by itself
-func (s SqlChannelStore) MigrateSidebarCategories(fromTeamId, fromUserId string) (map[string]interface{}, error) {
-	var userTeamMap []struct {
-		UserId string
-		TeamId string
-	}
-
-	transaction, err := s.GetMaster().Begin()
-	if err != nil {
-		return nil, err
-	}
-
-	defer finalizeTransaction(transaction)
-
-	if _, err := transaction.Select(&userTeamMap, "SELECT TeamId, UserId FROM TeamMembers LEFT JOIN Users ON Users.Id=UserId WHERE (TeamId, UserId) > (:FromTeamId, :FromUserId) ORDER BY TeamId, UserId LIMIT 100", map[string]interface{}{"FromTeamId": fromTeamId, "FromUserId": fromUserId}); err != nil {
-		return nil, err
-	}
-
-	if len(userTeamMap) == 0 {
-		// No more team members in query result means that the migration has finished.
-		return nil, nil
-	}
-
-	for _, u := range userTeamMap {
-		if err := s.createInitialSidebarCategoriesT(transaction, u.UserId, u.TeamId); err != nil {
-			return nil, err
-		}
-	}
-	if err := transaction.Commit(); err != nil {
-		return nil, err
-	}
-
-	data := make(map[string]interface{})
-	data["TeamId"] = userTeamMap[len(userTeamMap)-1].TeamId
-	data["UserId"] = userTeamMap[len(userTeamMap)-1].UserId
-
-	return data, nil
-}
-
 func (s SqlChannelStore) CreateInitialSidebarCategories(userId, teamId string) error {
 	transaction, err := s.GetMaster().Begin()
 	if err != nil {
@@ -510,20 +470,22 @@ func (s SqlChannelStore) createInitialSidebarCategoriesT(transaction *gorp.Trans
 		return errors.Wrap(err, "createInitialSidebarCategoriesT: failed to select existing categories")
 	}
 
-	hasCategoryOfType := func(categoryType model.SidebarCategoryType) bool {
-		for _, existingType := range existingTypes {
-			if categoryType == existingType {
-				return true
-			}
-		}
-
-		return false
+	hasCategoryOfType := make(map[model.SidebarCategoryType]bool, len(existingTypes))
+	for _, existingType := range existingTypes {
+		hasCategoryOfType[existingType] = true
 	}
 
-	if !hasCategoryOfType(model.SidebarCategoryFavorites) {
+	if !hasCategoryOfType[model.SidebarCategoryFavorites] {
+		favoritesCategoryId := model.NewId()
+
+		// Create the SidebarChannels first since there's more opportunity for something to fail here
+		if err := s.migrateFavoritesToSidebarT(transaction, userId, teamId, favoritesCategoryId); err != nil {
+			return errors.Wrap(err, "createInitialSidebarCategoriesT: failed to migrate favorites to sidebar")
+		}
+
 		if err := transaction.Insert(&model.SidebarCategory{
 			DisplayName: "Favorites", // This will be retranslated by the client into the user's locale
-			Id:          model.NewId(),
+			Id:          favoritesCategoryId,
 			UserId:      userId,
 			TeamId:      teamId,
 			Sorting:     model.SidebarCategorySortDefault,
@@ -534,7 +496,7 @@ func (s SqlChannelStore) createInitialSidebarCategoriesT(transaction *gorp.Trans
 		}
 	}
 
-	if !hasCategoryOfType(model.SidebarCategoryChannels) {
+	if !hasCategoryOfType[model.SidebarCategoryChannels] {
 		if err := transaction.Insert(&model.SidebarCategory{
 			DisplayName: "Channels", // This will be retranslateed by the client into the user's locale
 			Id:          model.NewId(),
@@ -548,7 +510,7 @@ func (s SqlChannelStore) createInitialSidebarCategoriesT(transaction *gorp.Trans
 		}
 	}
 
-	if !hasCategoryOfType(model.SidebarCategoryDirectMessages) {
+	if !hasCategoryOfType[model.SidebarCategoryDirectMessages] {
 		if err := transaction.Insert(&model.SidebarCategory{
 			DisplayName: "Direct Messages", // This will be retranslateed by the client into the user's locale
 			Id:          model.NewId(),
@@ -595,6 +557,45 @@ func (s SqlChannelStore) migrateMembershipToSidebar(transaction *gorp.Transactio
 	return memberships, nil
 }
 
+func (s SqlChannelStore) migrateFavoritesToSidebarT(transaction *gorp.Transaction, userId, teamId, favoritesCategoryId string) error {
+	favoritesQuery, favoritesParams, _ := s.getQueryBuilder().
+		Select("Preferences.Name").
+		From("Preferences").
+		Join("Channels on Preferences.Name = Channels.Id").
+		Join("ChannelMembers on Preferences.Name = ChannelMembers.ChannelId and Preferences.UserId = ChannelMembers.UserId").
+		Where(sq.Eq{
+			"Preferences.UserId":   userId,
+			"Preferences.Category": model.PREFERENCE_CATEGORY_FAVORITE_CHANNEL,
+			"Preferences.Value":    "true",
+		}).
+		Where(sq.Or{
+			sq.Eq{"Channels.TeamId": teamId},
+			sq.Eq{"Channels.TeamId": ""},
+		}).
+		OrderBy(
+			"Channels.DisplayName",
+			"Channels.Name ASC",
+		).ToSql()
+
+	var favoriteChannelIds []string
+	if _, err := transaction.Select(&favoriteChannelIds, favoritesQuery, favoritesParams...); err != nil {
+		return errors.Wrap(err, "migrateFavoritesToSidebarT: unable to get favorite channel IDs")
+	}
+
+	for i, channelId := range favoriteChannelIds {
+		if err := transaction.Insert(&model.SidebarChannel{
+			ChannelId:  channelId,
+			CategoryId: favoritesCategoryId,
+			UserId:     userId,
+			SortOrder:  int64(i * model.MinimalSidebarSortDistance),
+		}); err != nil {
+			return errors.Wrap(err, "migrateFavoritesToSidebarT: unable to insert SidebarChannel")
+		}
+	}
+
+	return nil
+}
+
 // MigrateFavoritesToSidebarChannels populates the SidebarChannels table by analyzing existing user preferences for favorites
 // **IMPORTANT** This function should only be called from the migration task and shouldn't be used by itself
 func (s SqlChannelStore) MigrateFavoritesToSidebarChannels(lastUserId string, runningOrder int64) (map[string]interface{}, error) {