I have a model with default values. My app gets the data from user through EditTexts and add them to Firebase Firestore. I hava an addData function (in AddAnalyzeActivity) and savefunction (in AddAnalyzeViewModel) for this operation. I'm getting EditText entries in AddAnalyzeActivity and adding them to my model but on this step ı want to add document id to my model but I can't access the documentIds properly in AddAnalyzeActivity. I can only access them with a forEach method when I try to retrieving the mentioned data with retrieveData function (in PairDetailVM) from Firestore but If I try to add document Ids in retrieveData method it only adds default value of documentId.

What I tried to:

1. Using @DocumentId annotation in my model.

2. Setting null default value of documentId in my model.

3. Getting a list of all documents' ids but can't match them with actual items.

Here is the screenShot for logic:

AnalyzeModel:

data class AnalyzeModel(
var concept: String?="",
var reason: String?="",
var result: String?="",
var rrRatio: Double?=0.0,
var tarih: Timestamp=Timestamp.now(),
var tradingViewUrl: String="",
var id : String="")

addData :

fun addData(view: View) {

    val tarih = com.google.firebase.Timestamp.now()
    val rr = rrText.text.toString()
    var doubleRR = rr.toDoubleOrNull()
    if (doubleRR == null) { doubleRR = 0.0 }

    val analyzeDTO = AnalyzeModel(
        conceptText.text.toString(),
        reasonForText.text.toString(),
        resultAddingText.text.toString(),
        doubleRR,
        tarih,
        chartImage.text.toString()
    )
    viewModel.save(analyzeDTO)

    val intent = Intent(this, PairDetailActivity::class.java)
    startActivity(intent)
    finish()
}

save :

    fun save(data: AnalyzeModel) {

    database.collection(dbCollection!!).document("Specified").collection("Pairs")
        .document(chosenPair!!)
        .collection("Analysis")
        .add(data)
        .addOnFailureListener { exception ->
            exception.printStackTrace()
            Toast.makeText(getApplication(), exception.localizedMessage, Toast.LENGTH_LONG).show()
        }
}

retrieveData:

    private fun retrieveData() {

    val docRef = collectionRef.orderBy("tarih", Query.Direction.DESCENDING)
    docRef.addSnapshotListener { value, error ->
        try {
            if (value != null && !value.isEmpty) {
                val allAnalysis= ArrayList<AnalyzeModel>()
                val documents = value.documents
                documents.forEach {
                    val analyze = it.toObject(AnalyzeModel::class.java)
                    if (analyze!=null){

                        allAnalysis.add(analyze)
                    }
                }

                list.value = allAnalysis
            } else if (error != null) {
                Toast.makeText(Application(), error.localizedMessage, Toast.LENGTH_LONG).show()
            }
        } catch (e: Exception) {
            e.printStackTrace()
          }
    }
}

CodePudding user response：

If you want to save the document ID into the document itself, consider separating the creation of the new DocumentReference from writing to it, by using `` instead of add.

fun save(data: AnalyzeModel) {

    val newRef = database.collection(dbCollection!!).document("Specified").collection("Pairs")
        .document(chosenPair!!)
        .collection("Analysis")
        .document()     //