fun exampleDataCollectionGroup()

in firestore/app/src/main/java/com/google/example/firestore/kotlin/DocSnippets.kt [742:806]
53 lines of code
1 McCabe index (conditional complexity)

    fun exampleDataCollectionGroup() {
        // [START fs_collection_group_query_data_setup]
        val citiesRef = db.collection("cities")

        val ggbData = mapOf(
                "name" to "Golden Gate Bridge",
                "type" to "bridge"
        )
        citiesRef.document("SF").collection("landmarks").add(ggbData)

        val lohData = mapOf(
                "name" to "Legion of Honor",
                "type" to "museum"
        )
        citiesRef.document("SF").collection("landmarks").add(lohData)

        val gpData = mapOf(
                "name" to "Griffth Park",
                "type" to "park"
        )
        citiesRef.document("LA").collection("landmarks").add(gpData)

        val tgData = mapOf(
                "name" to "The Getty",
                "type" to "museum"
        )
        citiesRef.document("LA").collection("landmarks").add(tgData)

        val lmData = mapOf(
                "name" to "Lincoln Memorial",
                "type" to "memorial"
        )
        citiesRef.document("DC").collection("landmarks").add(lmData)

        val nasaData = mapOf(
                "name" to "National Air and Space Museum",
                "type" to "museum"
        )
        citiesRef.document("DC").collection("landmarks").add(nasaData)

        val upData = mapOf(
                "name" to "Ueno Park",
                "type" to "park"
        )
        citiesRef.document("TOK").collection("landmarks").add(upData)

        val nmData = mapOf(
                "name" to "National Musuem of Nature and Science",
                "type" to "museum"
        )
        citiesRef.document("TOK").collection("landmarks").add(nmData)

        val jpData = mapOf(
                "name" to "Jingshan Park",
                "type" to "park"
        )
        citiesRef.document("BJ").collection("landmarks").add(jpData)

        val baoData = mapOf(
                "name" to "Beijing Ancient Observatory",
                "type" to "musuem"
        )
        citiesRef.document("BJ").collection("landmarks").add(baoData)
        // [END fs_collection_group_query_data_setup]
    }