CODEWITHSUNDEEP
androidfirebasekotlingoogle-cloud-firestoreandroid-jetpack-compose
Someone
Someone

Reputation: 197

How to get Array type data in Firebase in Kotlin?

I have this type of array in firebase but how to fetch it and use in kotlin I was able to get as String but how to get its as a data class
Like this

data class Comment(
    val uid: String,
    val comment: String,
    val stamp: Timestamp
)

and here's the code of getting string

var text by remember { mutableStateOf("loading...") }
FirebaseFirestore.getInstance().collection("MyApp")
  .document("Something").get().addOnSuccessListener {
     text = it.get("Comments").toString()
}

Check this iage

Upvotes: 1

Views: 1337

Answers (2)

kirkadev
kirkadev

Reputation: 348

I got ArrayLists with HashMaps represents my entities entities just using this:

                val cleanAnswers: List<Answer> = (document.get(FIELD_ANSWERS)
                        as ArrayList<HashMap<String, Any>>).map {
                    Answer(
                            it[FIELD_VARIANT] as String,
                            it[FIELD_IS_CORRECT] as Boolean
                        )
                }

My entity:

class Answer(val answer: String,
         val isCorrect: Boolean) : Serializable

Upvotes: 0

Dan Artillaga
Dan Artillaga

Reputation: 1945

Firebase has a toObject method that can be used to turn your document into a custom object.

db.collection("Comments")
    .get()
    .addOnSuccessListener { documents ->
        for (document in documents) {
            val comment = document.toObject<Comment>()
        }
    }

The Comment data class should also define default values. So, it should be like...

data class Comment(
    val uid: String = "",
    val comment: String = "",
    @ServerTimeStamp val stamp: Date? = null
)

Upvotes: 1

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