Embedded belongsTo to an unsaved record creates two POST request - ember-data

Question

I got an issue when i try to add an embedded belongTo to an unsaved record. When committing the transaction, I got two POST request. I don't know if I'm doing something wrong or not...
Here's my models and mapping:
Comment = App.Comment = DS.Model.extend({
title: DS.attr('string')
});
Group = App.Address = DS.Model.extend({
name: DS.attr('string')
});
Post = App.Post = DS.Model.extend({
title: DS.attr('string'),
comments: DS.hasMany(Comment),
group: DS.belongsTo(Group)
});
DS.RESTAdapte.map(Post, {
comments: { embedded: 'always' },
group: { embedded: 'always' }
});
My transaction
var transaction = store.transaction();
var post = transaction.createRecord(Post, {
title: 'This post is unsaved'
});
post.get('comments').createRecord({
title: 'This embedded record is also unsaved'
});
post.set('group', Group.createRecord({
name: 'My Group'
}));
transaction.commit();
Then I will have two POST request, one on '/post' wich is good and another one on '/group'.
Am I doing something wrong ? Thanks you !

Answer 1

It seems to me that you have 2 transactions:
the one that you create manually and that contains the post and the comments
the store's default one onto which you create the Group
You probably want your code to be like that:
post.set('group', transaction.createRecord(App.Group, {
name: 'My Group'
}));
Group.createRecord will use the store's default transaction.