Parse sees only first element from array in Android

Question

I am using Parse.com as my backend, and I want to download data from server. I have tags which filter these data. Unfortunately it works wrong. Lets say I have two tags "city1" and "city2", now I only get data for "city1".

public ArrayList<Dataset> getDatasetFromServer(Context context) {
    ParseQuery<ParseObject> query = ParseQuery.getQuery("Dataset");
    List<String> cities = DatabaseAdapter.getCityNames(context);
    //cities list contains "city1" and "city2"
    query.whereContainedIn("cities", Arrays.asList(cities.toArray(new String[cities.size()])));
    ArrayList<Dataset> dataset = new ArrayList<>();

    try {
        List<ParseObject> parseDataset = query.find();
        dataset = setDatasetList(parseDataset);
    } catch (ParseException e) {
        e.printStackTrace();
    }

    return dataset;
}

The problem is with this : Arrays.asList(cities.toArray(new String[cities.size()]). Don't know why, but this convertion works wrong with Parse. However, if I change above line to this

String[] array = {"city1", "city2"};
query.whereContainedIn("cities", Arrays.asList(array));

Everything works fine and I get data for city1 and city2. My question is, what's the difference between these two solutions and how to fix this so the first solution works?

EDIT : This also doesn't work :

query.whereContainedIn("cities", DatabaseAdapter.getCityNames(context));

getCityNames returns List<String>

Log what the following outputs: DatabaseAdapter.getCityNames() — Aashir
– Aashir, Commented Jan 2, 2015 at 16:32

nasch · Accepted Answer · 2015-01-02 00:28:31Z

1

Instead of converting your list to an array and then back to a list, just do this:

query.whereContainedIn("cities", cities);

answered Jan 2, 2015 at 0:28

nasch

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Comments

filipp.kowalski · Accepted Answer · 2015-01-03 15:06:57Z

0

The problem was my fault. Both solutions work good. The reason it didn't worked was that my method DatabaseAdapter.getCityNames(context) put a whitespace on the beggining of second element which I didn't saw.

answered Jan 3, 2015 at 15:06

filipp.kowalski

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