title: Core Data and Magical Record saving
body: <p>This is somewhat of a basic question, but need some clarification.</p>
  
  <p>I have this piece of code.</p>
  
  <pre><code>   //line of code #1
  
  [localContext MR_saveToPersistentStoreWithCompletion:^(BOOL success, NSError *error) {
  
     //line of code #2
  
  }];
  </code></pre>
  
  <p>Is the line of code #2 the completion block?  Should I make my changes to an entity prior to the save as line of code #1 shows?</p>
  
  <p>Thanks</p>