Kotlin/Parse : com.parse.ParseObject cannot be cast to

Question

I'm trying to do a Parse request but I got this error :

com.parse.ParseObject cannot be cast to com.mysapp.mys.common.model.Lesson

but it doesn't enter inside the subscribe after the return of the request. The answer of the server is good because I have the log of it on real-time.

I believe I have a problem when I receive the answer and when I cast implicitly with the lambda. But I don't know how to achieve it in another way.

fun getLessons(coach: Boolean, lessonType: LessonType?, date: Date?, position: LatLng, distance: Double): Single<List<Lesson>> { val params = hashMapOf<String, Any?>() if (lessonType == null){ params["lessonType"] = "" } else{ } params["lessonType"] = 12 params["date"] = date params["geoPoint"] = ParseGeoPoint(44.557514, -0.86099) params["within"] = 4935.772 Log.e("params : ", "lessonType: " + params.get("lessonType") + "| date : " + params.get("date").toString() + " | geoPoint: " + params.get("geoPoint") + " | within: "+ params.get("within")) return ParseObservable.callFunction<List<Lesson>>("getSessions", params).singleOrError() }

how I treat it :

disposables.add(repository.getLessons(false, lesson, dateSelected, position, distance.toDouble()) .observeOn(Schedulers.io()) .subscribe({ lessons -> Log.e("LESSONS", lessons.toString()) removeCanceledLessonsAndEmit(lessons) }, Throwable::printStackTrace) )

I don't know how Parse is working so that's why I have copied on this

request who already exists in the project :

fun getAverageRating(coachId: String): Single<HashMap<String, Int>> { val params = hashMapOf<String, String>() params["coachId"] = coachId return ParseObservable.callFunction<HashMap<String, Int>>("getAverageRating", params).singleOrError() }

how it's treated :

disposables.add(repository.getAverageRating(coachId) .observeOn(AndroidSchedulers.mainThread()) .subscribe({ rating -> if (rating > 0) { ratingBar.visibility = View.VISIBLE ratingBar.rating = rating } else ratingBar.visibility = View.GONE }, Throwable::printStackTrace) )

If you need any details feel free to ask me.

In subscribe, I need to convert the ParseObject to a subclass of ParseObject. Do you have any info on that. I get a ClassCastExpection when I try to do that. — thenoobtechie
– thenoobtechie, Commented Jun 27, 2019 at 7:18

minhazur · Accepted Answer · 2019-06-11 17:57:26Z

The following method getSessions is returning a ParseObject instead of returning a Lesson type object. Try to check the type and return appropriate model from that.

Change getLessons return type to this

 ParseObservable.callFunction<List<Any>>("getSessions", params).singleOrError()

and treat like this to check return type.

disposables.add(repository.getLessons(false, lesson, dateSelected, position, distance.toDouble()) .observeOn(Schedulers.io()) .subscribe({ lessons -> Log.e("LESSONS", lessons.toString()) //removeCanceledLessonsAndEmit(lessons) }, Throwable::printStackTrace) )

To get lessons in com.mysapp.mys.common.model.Lesson POJO you can do any of the followings

Annotate Lessons class with @ParseClassName("Lesson") See this answer for details
Cast parse object to JSON and use gson to convert to Lesson POJO

Finally, don't forget to do the necessary changes to this line ParseObservable.callFunction>("getSessions", params).singleOrError()

Yes now it entered in the subscribe ! But I still need to cast it into a List<Lesson>. I already tried the following which is not working : val list = lessons.filterIsInstance<Lesson>() if (list.size != lessons.size){ Log.e("CAST", "CAST FAILED") }
Casting won't help inside subscribe, you need to return lessons from getSessions method. You can add that method in your answer so that I can check.
the getSessions is on the server side and return automatically ParseObject
But I'm wondering something, why in the example I gave into my post (averageRating) it also returns a ParseObject but the cast to Int is working ?
Finally after some talk I understood that a ParseObject is like a JSON so I can read data like this : name = parseObject.getString("name")

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