Updates, errors, and the store

adapters.line.js

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

export default DS.RESTAdapter.extend({
  ajax(url, type, options) {
    const requestData = {
      url:    url,
      method: type
    };
    const payload = {
      errors: [
        {
          detail: 'KPOW!',
          source: {
            pointer: 'data/attributes/name',
          },
        },
      ],
    };
    
    // This line to FAIL
    const response = this.handleResponse(422, {}, payload, response);
    
    // This line to SUCCEED
    //const response = this.handleResponse(200, {}, {}, response);
    
    return new Ember.RSVP.Promise(function(resolve, reject) {
      Ember.run.join(null, reject, response);
    }, "Dummy request");
  },
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  init() {
    this._super();
    this.store.createRecord('line', {name: 'yksi'});
    this.store.createRecord('line', {name: 'kaksi'});
    this.store.createRecord('line', {name: 'kolme'});
  },
  
  newLine: Ember.computed(function() {
    return this.store.createRecord('line', {name: '...'});
  }),
  
  lines: Ember.computed(function() {
    return this.store.findAll('line');
  }),
  
  actions: {
    save() {
      const line = this.get('newLine');
      line.save().then(
        function() {},
        function() { line.deleteRecord(); },
      );
    },
        
    cancel() {
      this.get('newLine').deleteRecord();
    },
  },
});

models.line.js

import DS from 'ember-data';

export default DS.Model.extend({
  name: DS.attr('string'),
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    this.store.createRecord('line', {name: 'yksi'});
    this.store.createRecord('line', {name: 'kaksi'});
    this.store.createRecord('line', {name: 'kolme'});  
    return {
      lines: this.store.peekAll('line'),
      newLine: this.store.createRecord('line', {name: '...'})
    };
  }
});

templates.application.hbs

<h1>Updates, errors, and the store</h1>

<h2>What is this?</h2>

<p>Demo of something confusing I'm seeing on Ember Data.</p>

<p>Create a record on the store. The behaviour of `deleteRecord` varies depending on whether `save` is called on the record or not. Presently:</p>

<ul>
  <li>No attempt to `save`: removes the record form the store</li>
  <li>After a successful `save`: removes the record from the store</li>
  <li>After a failed `save`: apparently nothing</li>
</ul>

<p>This example uses a custom adapter that performs a dummy `save`. It will fail or succeed depending on two lines that can be commented/uncommented for experimentation.</p>

<h2>The example</h2>

<form>
  <p>
    Add a new line: {{input value=newLine.name}}
    <button {{action 'save'}}>Add</button>
  </p>
  <p>{{newLine.errors.name.0.message}}</p>
  <p><a href="#" {{action 'cancel'}}>Cancel</a></p>
</form>

<ul>
  {{#each lines as |line|}}
    <li>{{line.name}}</li>
  {{/each}} 
</ul>

twiddle.json

{
  "version": "0.7.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "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/2.4.3/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember-template-compiler.js"
  }
}