Prevent flagging of deleted posts and don't show deleted posts in flagged post list (#3846)

store/sql_post_store.go

@@ -149,7 +149,7 @@ func (s SqlPostStore) GetFlaggedPosts(userId string, offset int, limit int) Stor
 		pl := &model.PostList{}
 
 		var posts []*model.Post
-		if _, err := s.GetReplica().Select(&posts, "SELECT * FROM Posts WHERE Id IN (SELECT Name FROM Preferences WHERE UserId = :UserId AND Category = :Category) ORDER BY CreateAt ASC LIMIT :Limit OFFSET :Offset", map[string]interface{}{"UserId": userId, "Category": model.PREFERENCE_CATEGORY_FLAGGED_POST, "Offset": offset, "Limit": limit}); err != nil {
+		if _, err := s.GetReplica().Select(&posts, "SELECT * FROM Posts WHERE Id IN (SELECT Name FROM Preferences WHERE UserId = :UserId AND Category = :Category) AND DeleteAt = 0 ORDER BY CreateAt ASC LIMIT :Limit OFFSET :Offset", map[string]interface{}{"UserId": userId, "Category": model.PREFERENCE_CATEGORY_FLAGGED_POST, "Offset": offset, "Limit": limit}); err != nil {
 			result.Err = model.NewLocAppError("SqlPostStore.GetFlaggedPosts", "store.sql_post.get_flagged_posts.app_error", nil, err.Error())
 		} else {
 			for _, post := range posts {

store/sql_post_store_test.go

@@ -923,6 +923,14 @@ func TestPostStoreGetFlaggedPosts(t *testing.T) {
 	o2 = (<-store.Post().Save(o2)).Data.(*model.Post)
 	time.Sleep(2 * time.Millisecond)
 
+	o3 := &model.Post{}
+	o3.ChannelId = o1.ChannelId
+	o3.UserId = model.NewId()
+	o3.Message = "a" + model.NewId() + "b"
+	o3.DeleteAt = 1
+	o3 = (<-store.Post().Save(o3)).Data.(*model.Post)
+	time.Sleep(2 * time.Millisecond)
+
 	r1 := (<-store.Post().GetFlaggedPosts(o1.ChannelId, 0, 2)).Data.(*model.PostList)
 
 	if len(r1.Order) != 0 {
@@ -968,4 +976,19 @@ func TestPostStoreGetFlaggedPosts(t *testing.T) {
 	if len(r4.Order) != 2 {
 		t.Fatal("should have 2 posts")
 	}
+
+	preferences = model.Preferences{
+		{
+			UserId:   o1.UserId,
+			Category: model.PREFERENCE_CATEGORY_FLAGGED_POST,
+			Name:     o3.Id,
+			Value:    "true",
+		},
+	}
+
+	Must(store.Preference().Save(&preferences))
+
+	if len(r4.Order) != 2 {
+		t.Fatal("should have 2 posts")
+	}
 }