Delete records with errors

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  init() {
    this.store.createRecord('line', {name: "yksi"});
    this.store.createRecord('line', {name: "kaksi"});
    this.store.createRecord('line', {name: "kolme"});
  },
  
  lines: Ember.computed(function() {
    return this.store.findAll('line');
  }),
  
  actions: {
    invalidate(line) {
      // No problem if I use this to add the error
      //line.get('errors')._add('name', "is not up to scratch");
      
      // Recklessly using private APIs in order
      // to reproduce the problem with minimum code
      this.store.recordWasInvalid(
        line._internalModel, {
          name: "is not up to scratch",
        }
      );
    },
    
    delete(line) {
      line.deleteRecord();
    },
  },
});

models.line.js

import DS from 'ember-data';

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

templates.application.hbs

<h1>Why can't I delete records with errors?</h1>

<p>Trying to isolate a strange behaviour I'm observing in Ember Data.</p>

<p>To reproduce in an app, first create a record on the store. From there, the behaviour of <code>deleteRecord</code> varies depending on whether <code>save</code> is called on the record or not. Presently:</p>

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

<p>Records in the store:</p>

<ul>
  {{#each lines as |line|}}
    <li>
      {{line.name}}
      {{#if line.errors}}(<span style="color: red;">invalid</span>){{/if}}
      -
      <button {{action 'invalidate' line}}>make invalid</button>
      -
      <button {{action 'delete' line}}>delete</button>
    </li>
  {{/each}}
</ul>

twiddle.json

{
  "version": "0.7.1",
  "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"
  }
}