title: solution to take in other hand pointer to NSManagedObject
body: <p>in first loop i was take NSManaged object</p>
  
  <pre><code>    for (NSManagedObject *carrier in carriers)
      {
         // find one necessary carrier
      }
  </code></pre>
  
  <p>I need a transfer finded carrier object to second loop to using it for build inverse relationship.
  I tryed to declare </p>
  
  <pre><code>NSManagedObject *currentCarrier;
  </code></pre>
  
  <p>and make </p>
  
  <pre><code>currentCarrier = carrier;
  </code></pre>
  
  <p>but has a error 
  [NSManagedObject copyWithZone:]: unrecognized selector sent to instance 0x1a98190</p>
  
  <p>what is correct way to make transfer?</p>
  
  <p><strong>SOLUTION</strong></p>
  
  <p>Main issue what i can't directly using NSString object in forKey: 
  Bellow is a code, which working fine if u have to using external string forKey:</p>
  
  <pre><code>[destinstionsListForSale setValue:importRowElement forKey:[NSString stringWithFormat:@"%@",importRowsName]];
  </code></pre>