meta on model

app.initializers.meta.js

import Ember from 'ember';
import DS from 'ember-data';
const {set} = Ember;
export function initialize(application) {
  DS.Model.reopen({
    meta: null,
    didCommit() {
      this._super(...arguments);
      set(this, 'meta', this.store._metadataFor(this.constructor.modelName));
    }
  });
};

export default {
  name: 'meta',
  initialize: initialize
};

application.adapter.js

import Ember from 'ember';
import DS from 'ember-data';

const {get} = Ember;

export default DS.JSONAPIAdapter.extend({
  deleteRecord(store, type, snapshot) {
    return {
      meta: {
        message: 'delete ok'
      }
    };
  },
  createRecord (store, type, snapshot) {
    return {
      meta: {
        message: 'now created',
      },
      data: {
        type: 'demo',
        id: '1'
      }
    };
  }
});

application.controller.js

import Ember from 'ember';
const{get} = Ember;
export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actions: {
    test() {
      let store = this.store;
      let demo = this.store.createRecord('demo');
      demo.save().then(() => {
        console.log('saved meta:', get(demo, 'meta'));
        return demo.destroyRecord();
      }).then(() => {
        console.log('destroyed meta:', get(demo, 'meta'));
      });
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<button {{action "test"}}>Test</button>
<br>
<br>

models.demo.js

import DS from 'ember-data';

export default DS.Model.extend({
  
});

twiddle.json

{
  "version": "0.6.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.3.1/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.3.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}