MM-11572: Force correct order on messages generated in the bulk (#9244)

store/sqlstore/channel_store.go

@@ -1921,3 +1921,11 @@ func (s SqlChannelStore) ClearAllCustomRoleAssignments() store.StoreChannel {
 		}
 	})
 }
+
+func (s SqlChannelStore) ResetLastPostAt() store.StoreChannel {
+	return store.Do(func(result *store.StoreResult) {
+		if _, err := s.GetMaster().Exec("UPDATE Channels SET LastPostAt = (SELECT UpdateAt FROM Posts WHERE ChannelId = Channels.Id ORDER BY UpdateAt DESC LIMIT 1);"); err != nil {
+			result.Err = model.NewAppError("SqlChannelStore.ResetLastPostAt", "store.sql_channel.reset_last_post_at.app_error", nil, err.Error(), http.StatusInternalServerError)
+		}
+	})
+}

store/store.go

@@ -172,6 +172,7 @@ type ChannelStore interface {
 	MigrateChannelMembers(fromChannelId string, fromUserId string) StoreChannel
 	ResetAllChannelSchemes() StoreChannel
 	ClearAllCustomRoleAssignments() StoreChannel
+	ResetLastPostAt() StoreChannel
 }
 
 type ChannelMemberHistoryStore interface {

store/storetest/mocks/ChannelStore.go

@@ -711,6 +711,22 @@ func (_m *ChannelStore) ResetAllChannelSchemes() store.StoreChannel {
 	return r0
 }
 
+// ResetLastPostAt provides a mock function with given fields:
+func (_m *ChannelStore) ResetLastPostAt() store.StoreChannel {
+	ret := _m.Called()
+
+	var r0 store.StoreChannel
+	if rf, ok := ret.Get(0).(func() store.StoreChannel); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(store.StoreChannel)
+		}
+	}
+
+	return r0
+}
+
 // Restore provides a mock function with given fields: channelId, time
 func (_m *ChannelStore) Restore(channelId string, time int64) store.StoreChannel {
 	ret := _m.Called(channelId, time)