使用 updateOptions() 更新 FirestoreRecyclerAdapter 会出现类型不匹配错误

我正在使用 Firebase UI 填充我的 RecyclerView，一切正常，除非我在单击按钮时尝试更改列表元素的顺序。

这是我的适配器代码：

private var query: Query = FirebaseFirestore.getInstance()
    .collection("restaurant")
    .orderBy("review", Query.Direction.DESCENDING)

var options: FirestoreRecyclerOptions<Restaurant> = FirestoreRecyclerOptions.Builder<Restaurant>()
    .setQuery(query, Restaurant::class.java)
    .build()

private var adapter: FirestoreRecyclerAdapter<*, *> =
    object : FirestoreRecyclerAdapter<Restaurant, RestaurantListAdapter.ViewHolder?>(options) {
        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RestaurantListAdapter.ViewHolder {
            val view = LayoutInflater.from(parent.context)
                .inflate(R.layout.restaurant_card_view_design, parent, false)
            return RestaurantListAdapter.ViewHolder(view)
        }

        @SuppressLint("ResourceAsColor")
        override fun onBindViewHolder(
            holder: RestaurantListAdapter.ViewHolder , position: Int, model: Restaurant
        ) {
            val sharedPref = getPreferences(Context.MODE_PRIVATE) ?: return
            val defaultValue = resources.getString(R.string.def_loc_key)
            val lat = sharedPref.getFloat(getString(R.string.latitude_key), defaultValue.toFloat())
            val long = sharedPref.getFloat(getString(R.string.longitude_key), defaultValue.toFloat())

            model.calculateDistance(lat, long)

            // sets the text to the textview from our itemHolder class
            holder.distance.text = String.format("%.1f mi", model.distance)
            holder.name.text = model.name
            holder.reviewNum.text = String.format("(%1d)", model.numReview)
            holder.review.rating = model.review
            if (position == 0) {
                //holder.card.setCardBackgroundColor(R.color.recommendedCard)
                holder.card.setCardBackgroundColor(ContextCompat.getColor(holder.card.context, R.color.recommendedCard))
            }
            holder.logo.setImageResource(
                resources.getIdentifier(model.logo , "drawable",
                packageName
            ))
        }
    }

这是我的按钮单击代码（在 onCreate() 内）：

val sortButton = findViewById<ImageButton>(R.id.sortButton)
sortButton.setOnClickListener {
    query = query.orderBy("numReviews", Query.Direction.DESCENDING) // new campo

    options = FirestoreRecyclerOptions.Builder<Restaurant>()
        .setQuery(query, Restaurant::class.java).build()

    adapter.updateOptions(options)
}

我在最后一行收到一个错误：

类型不匹配：推断类型为 FirestoreRecyclerOptions 但没有预期的内容

当您使用以下查询时：

private var query: Query = FirebaseFirestore.getInstance()
    .collection("restaurant")
    .orderBy("review", Query.Direction.DESCENDING)

它只是意味着尝试获取“餐厅”集合中存在的所有文档，并按“评论”降序排列。这很好。但是，当您使用以下行时：

query = query.orderBy("numReviews", Query.Direction.DESCENDING)

这意味着您要向现有查询添加额外的订单。因此，添加上述 orderBy 后，您的查询如下所示：

private var query: Query = FirebaseFirestore.getInstance()
    .collection("restaurant")
    .orderBy("review", Query.Direction.DESCENDING)
    .orderBy("numReviews", Query.Direction.DESCENDING)

这种类型的查询默认不起作用，因为它需要index https://stackoverflow.com/questions/50305328/firestore-whereequalto-orderby-and-limit1-not-working.

请注意，Cloud Firestore 查询是不可变的，这意味着您无法更改现有查询的属性。如果通过调用“orderBy()”方法更改值，它将成为一个新查询。因此，如果您只想更改顺序，只需将第二个查询更改为：

query = FirebaseFirestore.getInstance()
    .collection("restaurant")
    .orderBy("numReviews", Query.Direction.DESCENDING)
//                 ????