title: How to create Backbone collection from following json array?
body: <p>I am getting a following <code>JSON</code>(/users.json) which contains users: </p>
  
  <pre><code>[
    [
      { "id": "43343", "project_id": "1", "username": "Amy" }
      { "id": "34244", "project_id": "1", "username": "Tommy" }
    ],
    [
      { "id": "76575", "project_id": "2", "username": "Izzy" }
      { "id": "13322", "project_id": "2", "username": "Sam" }
    ],
    { "id": "09983", "project_id": "3", "username": "Max" }
  ]
  </code></pre>
  
  <p>When project has one user I get one user hash which is not in array.</p>
  
  <p>I would like to build a Backbone collection with all users. How to do that?</p>