Cheers! I have some model, and one attribute of it is an array, but for some reasons (I use mongoDB on the server and it\'s problem with embedded models and ember-data) I can\'t
For those, who have the same problem as me: check out this answer:
https://stackoverflow.com/a/13884238/1662820
Or you can pass embedded models with hasMany relation and set custom primary key for embedded model in the adapter ('number' in my case). Look at this tests:
https://github.com/emberjs/data/blob/master/packages/ember-data/tests/integration/embedded/embedded_without_ids_test.js