ember multi level has many serialization issue - serialization

Question

I am facing some issues with my serialization of model. Below is a detailed code which will show how my current model and corresponding serializers look.
User model
export default Model.extend({
name: attr('string'),
accounts: hasMany('account', {async: false})
});
Account model
export default Model.extend({
type: attr('string'),
transactions: hasMany('transaction')
})
Transaction model
export default Model.extend({
date: attr('string'),
amount: attr('number')
})
So basically its a hasMany within another hasMany.
Serializers looks like this:
base serializer:
export default BaseSerializer.extend({
keyForAttribute(key) {
return key.underscore();
},
keyForRelationship(key, relationship) {
return key.underscore();
}
});
User serializer:
export default BaseSerializer.extend(DS.EmbeddedRecordsMixin, {
attrs: {
account: { embedded: 'always' }
}
});
Account serializer:
export default BaseSerializer.extend(DS.EmbeddedRecordsMixin, {
attrs: {
transaction: { embedded: 'always' }
}
});
Now when I am invoking api call which gives me a json response where user model has a property named as accounts: which internally have another property called as transactions, I am expecting them to serialize but somehow its not working. have I done anything wrong here? Please advise as I am new to ember and still learning it.
Base serializer is:
export default DS.JSONSerializer.extend(DS.EmbeddedRecordsMixin, {
keyForRelationship(key, relationship) {
return key.underscore();
}
})
Serialized json
I dont have it but from the console logs, seems like only user model is getting serialized as when I tried to print console.log(user.get('accounts').get('firstObject').get('type') then i saw undefined there.
What I want is:
{
name: "bhavya"
accounts: [
{
type : 'savings',
transactions: [
{
amount: 500
}
]
}
]
}