title: .increment vs += 1
body: <p>I have a Picture model that contains a variable for a view count (integer).
  The view count is incremented by +1 every time someone views the Picture object.</p>
  
  <p>In getting this done, what is the difference between</p>
  
  <pre><code>   @picture.view_count += 1
     @picture.save
  </code></pre>
  
  <p>and</p>
  
  <pre><code>   @picture.increment(:view_count, 1)
  </code></pre>
  
  <p>also if i use increment, is .save necessary?</p>