Support for List

[AkshayChordiya]

Hi,

This library already looks great, but I have read all the docs you provided but I didn't read anywhere that this library supports any type of List like Array List etc.

Can you please let me know if it supports?

Thank you.

[nhachicha]

Hi @AkshayChordiya

You can either convert your list into an array

 ArrayList#toArray(T[])

then save it. (check BasicOperations#testObjectArray class)
or use getObject

snappyDB = DBFactory.open(getContext(), dbName);
        List<Book> books = new ArrayList<>(3);
        books.add(new Book("Echo Burning", "0-399-14726-8"));
        books.add(new Book("Nothing To Lose", "0-593-05702-3"));
        books.add(new Book("61 Hours", "978-0-593-05706-3"));

        snappyDB.put("books", books);

        ArrayList<Book> mySavedBooks = (ArrayList<Book>) snappyDB.getObject("books", ArrayList.class);

        assertNotNull(mySavedBooks);
        assertEquals(mySavedBooks.size(), books.size());
        assertEquals(books.get(0).hashCode(), mySavedBooks.get(0).hashCode());
        assertEquals(books.get(1).hashCode(), mySavedBooks.get(1).hashCode());
        assertEquals(books.get(2).hashCode(), mySavedBooks.get(2).hashCode());

cheers

[AkshayChordiya]

@nhachicha
Thank you so much.

[AmirAzizi]

Hi,
can I use this library for nested object (foreign key)
How can I save them ?
Thank you.

[SophieKrt]

Hello, I want to save an ArrayList of objects into the SnappyDB and retrieve it, when necessary. I follow the instructions as given and the arrayList is saved, but when I try to retrieve it from the DB, the error caught is : "Maybe you tried to retrieve an array using this method ? please use getObjectArray instead Class cannot be created (missing no-arg constructor): com.google.gson.JsonPrimitive".
My code is :
public static ArrayList getOfflineResearches() {
ArrayList mySavedResearches = null;
try {
mySavedResearches = (ArrayList) snappy.getObject(Constants.RESEARCHES_OFFLINE, ArrayList.class);

    } catch (SnappydbException e) {
        e.printStackTrace();
    }
    if (mySavedResearches != null) return mySavedResearches;
    return new ArrayList<>();
}

Any ideas?

[davidtcdeveloper]

@SophieKrt
How to you save the data? Instead of saving the ArrayList, try to convert the list into an array of objects and then convert it back when restoring.
It works this way here.

[SophieKrt]

Thank you , I will try to save my objects this way.