title: Error creating a batch of documents
body: <p>Following the <a href="http://mongoid.org/en/mongoid/docs/persistence.html" rel="nofollow">Mongoid documentation</a> I'm trying to pass an array of hashes to the <code>create</code> method, but it throws an error.</p>
  
  <p>The code is:</p>
  
  <pre><code>Person.create([
    { first_name: "Heinrich", last_name: "Heine" },
    { first_name: "Willy", last_name: "Brandt" }
  ])
  </code></pre>
  
  <p>It throws the following error:</p>
  
  <pre><code>NoMethodError: undefined method `keys' for #&lt;Array:0xae4f69c&gt;
  </code></pre>
  
  <p>Running:</p>
  
  <pre><code>mongoid-3.0.23
  ruby 1.9.3
  rails 3.2.13
  </code></pre>