Refer to relationship in addUpdateListener

Android
1

How can I refer to relationships in a method addUpdateListener. The following code returns nothing to me.

groupRt.addUpdateListener("users = '$objectId'", object : AsyncCallback<Group> {
                override fun handleResponse(response: Group?) {
                    for (i in groupList.indices) {
                        if (groupList[i].objectId == response?.objectId) {
                            if (response != null) {
                                groupList[i] = response
                            }
                        }
                    }
                    Log.e("back", response.toString())
                    coroutine.resume(groupList)
                }

                override fun handleFault(fault: BackendlessFault?) {
                    Log.e("back", fault?.message!!)
                }
            })

Below is an example of my table

image
image1920×1080 296 KB

2

Hello @Vital_Yarosh

We will be happy to assist you. I need to ask you a few more questions so I can understand the problem better.
Please show how you create groupRt.
Class Group mapping to groupUsers Table?
What values does an $objectId take?
How do you update an object?
Are there no entries in the logs?
Have you tried to debug and see if the code goes into the handleResponse or handleFault section?

3 
private val groupData: IDataStore<Group> = Backendless.Data.of(Group::class.java)
private val groupRt: EventHandler<Group> = groupData.rt()

Yes, Class Group mapping to groupUsers Table.
ObjectId takes a user ID of type string.
If I write “ownerId = ‘$objectId’” in whereClause, the data is updated. I need to filter by users relationship.

I need to display a list of groups where this user is.
Below is a complete diagram of all tables. Maybe you need to create additional links?

image
image1920×1080 433 KB

4

Do you want the addUpdateListener to be triggered only if there is an update of the groupUser object that has a child User object with a specific objectId?

From documentation Condition Syntax
The syntax in the real-time system excludes the following, more complex scenarios: