/**
 * Get child's sheet and meal for specific day from the DB
 * Use a Cloud Function
 */
fun getChildSheet(date: Date?, child: Child?) : Observable<Pair<ChildSheet?, List<Dish>?>> {
    val params = mutableMapOf<String, Any>()

    params.put("date", date ?: "")
    params.put("childId", child?.objectId ?: "")
    params.put("schoolId", child?.school?.objectId ?: "")

    return ParseObservable.callFunction<HashMap<String, ParseObject>>("getChildSheetV2", params)
            .flatMap<Pair<ChildSheet?, List<Dish>?>> {
                Observable.just(Pair(it["childSheet"] as? ChildSheet, (it["meal"] as? List<*>)?.filterIsInstance<Dish>()))
            }
            .observeOn(AndroidSchedulers.mainThread())
}