title: Parse Cloud Query array contains value
body: <p>I have a parse data model like...</p>
  
  <pre><code>Parent
  ------
  children - Array of pointers to Child objects
  </code></pre>
  
  <p>I'm trying to create a query that says...</p>
  
  <blockquote>
    <p>Find all Parents where the children array contains the specific Child object.</p>
  </blockquote>
  
  <p>It's sort of the opposite of this function from the docs.</p>
  
  <pre><code>query.containedIn("playerName", ["Jonathan Walsh", "Dario Wunsch", "Shawn Simon"]);
  // note you can also do this with object pointers which is EXACTLY opposite to what I want.
  </code></pre>
  
  <p>This will find all the <code>players</code> where the <code>playerName</code> is contained in the given array.</p>
  
  <p>I want this but I want to give a value and that value to be in the array for the key.</p>
  
  <p>I imagine it's something like...</p>
  
  <pre><code>query.contains("children", someChildObject);
  </code></pre>
  
  <p>but the docs for <code>contains</code> shows it only works for substrings of strings.</p>
  
  <p>How would I do what I'm looking for?</p>