Android Parse query returning Empty List

Question

I have a parse class named "classA". I want to build a query where I want to search for rows in "classA" having certain "objectId". I have written the following code. But it always returns an empty list of ParseObjects. I have tried with separate columns existing in "classA". All the time, empty list returned. Please help.

I have used this query before on another class "classB" inside the same application and that works perfectly. I have also tried, "try-catch" block implementation using "query.find". That also returns empty list. Thanks in advance. Please explain what's wrong.

Need more code snippets, please let me know.

    Button btn = (Button) findViewById(R.id.query_btn);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            EditText objIdET= (EditText) findViewById(R.id.obj_id);
            String objId= objIdET.getText().toString();
            Log.d("check", objId); // Prints correct value here..

            ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("classA");
            fridgeID.whereEqualTo("objectId", objId);
            List<ParseObject> lp = new ArrayList<ParseObject>();
            query.findInBackground(new FindCallback<ParseObject>() {
                @Override
                public void done(List<ParseObject> objects, ParseException e) {
                    Log.d("#results", String.valueOf(objects.size()));
                }
            });

            }
        }
    });

Rajan Kali · Accepted Answer · 2015-09-24 15:35:45Z

1

Replace FridgeId with query

ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("classA");
            query.whereEqualTo("objectId", objId);
            List<ParseObject> lp = new ArrayList<ParseObject>();
            query.findInBackground(new FindCallback<ParseObject>() {
                @Override
                public void done(List<ParseObject> objects, ParseException e) {
                    Log.d("#results", String.valueOf(objects.size()));
                }
            });

answered Sep 24, 2015 at 15:35

Rajan Kali

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1 Comment

Rajan Kali Over a year ago

Check your column and Class name in Parse,it is Case Sensitive

Ved · Accepted Answer · 2015-09-24 18:43:59Z

0

Use getInBackground() if you have objectId of that row.

ParseQuery<ParseObject> query = ParseQuery.getQuery("classA");
query.getInBackground(objId, new GetCallback<ParseObject>() {
 public void done(ParseObject object, ParseException e) {
     if (e == null) {
         Log.d("#results", String.valueOf(objects.size()));
     } else {
         // Handle the error
     }
 }
}

Call findInBackground() if you don't have objectId and setting some condition. You can also set condition on objectId field like this.

ParseQuery<ParseObject> query = ParseQuery.getQuery("classA");
query.whereEqualTo("objectId", objId);
query.findInBackground(new FindCallback<ParseObject>() {
 public void done(List<ParseObject> objects, ParseException e) {
     if (e == null) {
         Log.d("#results", String.valueOf(objects.size()));
     } else {
         // Handle the error
     }
 }
}

answered Sep 24, 2015 at 18:43

Ved

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5 Comments

Reutzesen Over a year ago

Thanks. But, still not working. I have checked further. It is not working only in the particular activity. The same query is producing correct result inside MainActivity. Any solution?

Ved Over a year ago

have you got any exception?

Reutzesen Over a year ago

I am printing the error. Returns this - Error﹕ no results found for query

Ved Over a year ago

Then maybe you are calling wrong class name or wrong objectId for that class. please check your objectId in Parse dashboard for that class.Also check for your correct project if you are using two different project for testing and development.

Reutzesen Over a year ago

No, the class name is correct. It stopped working from other activities (including Main) as well. Is there any restriction on number of classes I can create and query with a free account?

Neo · Accepted Answer · 2015-09-29 17:15:37Z

0

You are getting an empty list of Parse objects because there aren't any rows corresponding to the user (which you are logged in with).

Parse.com implements privacy of its data by using a field called ACL. So if user A adds an entry to your table, by default the ACL is set to Read+Write for User A and none for other users. So user B will not be able to find any objects of userA.

To read more : https://parse.com/docs/android/guide#security

If you want to create a mechanism by which only users belonging to a certain group can read+write each other's objects, you can Roles (Parse feature).

https://parse.com/docs/android/guide#roles

answered Sep 29, 2015 at 17:15

Neo

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Comments

user4292106 · Accepted Answer · 2015-12-11 11:34:41Z

0

Check if you have set the correct keys when you initialize the parse in your application.

answered Dec 11, 2015 at 11:34

user4292106

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Comments

Tomerikoo · Accepted Answer · 2021-07-08 15:27:09Z

0

If you want to get list of users, and ParseQuery.getQuery doesn't work - try this:

val query: ParseQuery<ParseUser> = ParseUser.getQuery()
    query.findInBackground() {...}

edited Jul 8, 2021 at 15:27

Tomerikoo

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answered Jul 8, 2021 at 15:13

volvadvit

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