title: AngularJS + AngularFire = How to edit entry
body: <p>My <code>$scope</code> has:</p>
  
  <p><code>$scope.current_account_key</code> - key from my update modal</p>
  
  <p><code>$scope.current_account</code> which has a name: <code>$scope.current_account.name</code>, and a description <code>$scope.current_account.description</code> (account is my entry)</p>
  
  <p>I want to update an entry in Firebase with these values.</p>
  
  <p>Firebase tree:</p>
  
  <pre><code>accounts
      -JL7e0Obv18-Ls6TTkk8
          description
          name
  </code></pre>