Ember Polymorphic Serialization

polymorphic-mixin.js

import Ember from 'ember';

export default Ember.Mixin.create({
  normalize: function(type, hash, prop) {
    if (hash.type) {
      let typeKey = this.typeForRoot(hash.type);
      let newType = this.store.modelFor(typeKey);
      if (newType) {
        type = newType;
      }
    }

    return this._super(type, hash, prop);
  }
});

store.js

import DS from 'ember-data';

export default DS.Store.extend({
  push: function(type, data, _partial) {
    var oldType = type;
    var dataType = data.type;
    var modelType = oldType;

    if (dataType && (this.modelFor(oldType) !== this.modelFor(dataType))) {
      modelType = dataType;

      var oldRecord = this.getById(oldType, data.id);
      if (oldRecord) {
        this.dematerializeRecord(oldRecord);
      }
    }

    return this._super(this.modelFor(modelType), data, _partial);
  }
});