Added ChannelExtra.MemberCount field to reflect the actual member count when we truncate the list of members to 20

store/sql_channel_store.go

@@ -542,6 +542,26 @@ func (s SqlChannelStore) GetMember(channelId string, userId string) StoreChannel
 	return storeChannel
 }
 
+func (s SqlChannelStore) GetMemberCount(channelId string) StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		count, err := s.GetReplica().SelectInt("SELECT count(*) FROM ChannelMembers WHERE ChannelId = :ChannelId", map[string]interface{}{"ChannelId": channelId})
+		if err != nil {
+			result.Err = model.NewAppError("SqlChannelStore.GetMemberCount", "We couldn't get the channel member count", "channel_id="+channelId+", "+err.Error())
+		} else {
+			result.Data = count
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
 func (s SqlChannelStore) GetExtraMembers(channelId string, limit int) StoreChannel {
 	storeChannel := make(StoreChannel)
 

store/sql_channel_store_test.go

@@ -339,15 +339,15 @@ func TestChannelMemberStore(t *testing.T) {
 		t.Fatal("Member update time incorrect")
 	}
 
-	members := (<-store.Channel().GetMembers(o1.ChannelId)).Data.([]model.ChannelMember)
-	if len(members) != 2 {
+	count := (<-store.Channel().GetMemberCount(o1.ChannelId)).Data.(int64)
+	if count != 2 {
 		t.Fatal("should have saved 2 members")
 	}
 
 	Must(store.Channel().RemoveMember(o2.ChannelId, o2.UserId))
 
-	members = (<-store.Channel().GetMembers(o1.ChannelId)).Data.([]model.ChannelMember)
-	if len(members) != 1 {
+	count = (<-store.Channel().GetMemberCount(o1.ChannelId)).Data.(int64)
+	if count != 1 {
 		t.Fatal("should have removed 1 member")
 	}
 

store/store.go

@@ -70,6 +70,7 @@ type ChannelStore interface {
 	UpdateMember(member *model.ChannelMember) StoreChannel
 	GetMembers(channelId string) StoreChannel
 	GetMember(channelId string, userId string) StoreChannel
+	GetMemberCount(channelId string) StoreChannel
 	RemoveMember(channelId string, userId string) StoreChannel
 	GetExtraMembers(channelId string, limit int) StoreChannel
 	CheckPermissionsTo(teamId string, channelId string, userId string) StoreChannel