Ember Data: Mapping Arrays - ember.js

Question

I am trying to define an Ember Data Model from the following response I am getting from the API. I am having issues defining the num_activity_per_map field since its an array of JSON objects however they do not have an id. If I use DS.hasMany('activityPerDate', {async:true}) complains it doesn't have a primary key.
{
"stats": {
"num_users": 44,
"num_activity_per_date": [
{
"date": "04-10-2015",
"count": 6
},
{
"date": "05-10-2015",
"count": 8
},
{
"date": "06-10-2015",
"count": 7
},
{
"date": "07-10-2015",
"count": 5
},
{
"date": "08-10-2015",
"count": 3
}
],
}
}

Answer 1

You have a few different options:
Treat num_activity_per_date as a raw attribute by using DS.attr() to declare it.
Treat num_activity_per_date as a custom attribute type by writing a custom transform.
Treat num_activity_per_date as an embedded relationship.
It seems like you might want to go with #3. You'll want to override the serializer for the parent model to look something like this:
import DS from 'ember-data';
export default DS.RESTSerializer.extend(DS.EmbeddedRecordsMixin, {
attrs: {
activityPerDate: { embedded: 'always' }
}
});
Then declare activityPerDate: DS.hasMany('activityPerDate') and it should be taken care of. (I say should because I've never gotten embedded records to work properly. But it's also been a very long time since I've tried. YMMV.)