What’s the difference between -existingObjectWithID:error: and –objectWithID: ?
What’s the difference between -existingObjectWithID:error: and –objectWithID: ?
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What’s the difference between -existingObjectWithID:error: and –objectWithID: ?
objectWithID:assumes the object exists so if you give it a bad ID it will throw an exception when you attempt to access a property on the returned entity. Also, this method always returns an entity.existingObjectWithID:error:will return an object if it exists andnilif it does not. If there was an error it will populate the error pointer.