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Re: Value Transformer Name
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Re: Value Transformer Name


  • Subject: Re: Value Transformer Name
  • From: Richard Somers <email@hidden>
  • Date: Fri, 10 Apr 2009 10:57:51 -0600

On Apr 10, 2009, at 10:41AM, Quincey Morris wrote:

However, the NSKeyedUnarchiveFromDataTransformerName transformer transforms an instance of NSData to an instance of whatever was archived in it.

So, the default transformer goes *from* NSData. Custom transformers go *to* NSData.

So, you cannot specify the default transformer explicitly, because that would make Core Data use it in the wrong direction.

The documentation indicates NSKeyedUnarchiveFromDataTransformerName supports reverse transformation. Single class with bidirectional transformation. Use –transformedValue: to go one way and – reverseTransformedValue: to go the other way.


Richard

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  • Follow-Ups:
    • Re: Value Transformer Name
      • From: Quincey Morris <email@hidden>
References: 
 >Value Transformer Name (From: Richard Somers <email@hidden>)
 >Re: Value Transformer Name (From: Keary Suska <email@hidden>)
 >Re: Value Transformer Name (From: Quincey Morris <email@hidden>)

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