title: Querying array elements with Mongo
body: <p>How can I query the smoothies that have apple in them? (below is a collection with 3 documents)</p>
  
  <pre><code>_id =&gt; 1
  name =&gt; 'best smoothie' 
  ingredients =&gt; Array
      (
          [0] =&gt; apple
          [1] =&gt; raspberry
          [2] =&gt; orange
          [3] =&gt; banana
      )
  _id =&gt; 2
  name =&gt; 'summer smoothie' 
  ingredients =&gt; Array
      (
          [0] =&gt; lemon
          [1] =&gt; mint
  
      )
  _id =&gt; 3
  name =&gt; 'yogurt smoothie' 
  ingredients =&gt; Array
      (
          [0] =&gt; apple
          [1] =&gt; blueberry
  
      )
  </code></pre>