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PONormalize or Canonicalize string for Core Data?
 

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    <p>I've watched some of the WWDC videos on Core Data and I'm planning on maintaining a canonicalized text property. Let's say I have the following data:</p> <pre><code>originalString normalizedString (+lowercase?) Ønsker onsker onsker onsker Onsker onsker </code></pre> <p>When I query my model, I want to sort it by 'normalizedString' so that it ignores the case and the Ø (or other characters). I also want to be able to run a query like "starts with 'o'" and have it return the 3 words above.</p> <p>I was trying to avoid to do something like:</p> <pre><code>[NSPredicate predicateWithFormat:@"(originalString like[cd] %@)"... </code></pre> <p>for querying the model. I was also trying to use the 'originalString' for my sorting.</p> <p>I've tried two different approaches with no success, my normalized string is still saved as the originalString (I override the setter in a category I created):</p> <ol> <li><p>Calling decomposedStringWithCanonicalMapping:</p> <pre><code>// ... [normalizedString decomposedStringWithCanonicalMapping]; // ... </code></pre></li> <li><p>Followed <a href="https://developer.apple.com/library/mac/#samplecode/DerivedProperty/Introduction/Intro.html" rel="nofollow">this example</a>: </p> <pre><code>// ... CFStringNormalize((CFMutableStringRef)normalizedString, kCFStringNormalizationFormD); CFStringFold((CFMutableStringRef)normalizedString, kCFCompareCaseInsensitive | kCFCompareDiacriticInsensitive | kCFCompareWidthInsensitive, NULL); </code></pre></li> </ol> <p>Any ideas on how I can accomplish my goal?</p> <p>Edit: Here's my overridden setter, which I know it gets called:</p> <pre><code>- (void) setNormalizedName:(NSString *)newNormalizedName { NSMutableString *normalizedString; if (![self.lastName length] == 0) { normalizedString = [NSMutableString stringWithString:self.lastName]; } else { normalizedString = [NSMutableString stringWithString:self.firstName]; } // CFStringNormalize((CFMutableStringRef)normalizedString, kCFStringNormalizationFormD); // CFStringFold((CFMutableStringRef)normalizedString, kCFCompareCaseInsensitive | kCFCompareDiacriticInsensitive | kCFCompareWidthInsensitive, NULL); [normalizedString decomposedStringWithCanonicalMapping]; [self willChangeValueForKey:@"normalizedName"]; [self setPrimitiveValue:normalizedString forKey:@"normalizedName"]; [self didChangeValueForKey:@"normalizedName"]; } </code></pre>
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    1. COPlease show the code of your custom setter method. I don't see why this shouldn't work.
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    2. CO@MartinR I've edited my question to include my setter method.
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