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POIn CakePHP, how can you determine if a field was changed in an edit action?
 

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    <p>I'm using the <code>cacheCounter</code> in <code>CakePHP</code>, which increments a counter for related fields.</p> <p>Example, I have a Person table a Source table. Person.source_id maps to a row in the Source table. Each person has one Source, and each Source has none or many Person rows.</p> <p><code>cacheCounter</code> is working great when I change the value of a source on a person. It increments <code>Source.Person_Count</code>. Cool.</p> <p>But when it increments, it adds it to the destination source for a person, but doesn't remove it from the old value. I tried <code>updateCacheControl()</code> in <code>afterSave</code>, but that didn't do anything.</p> <p>So then I wrote some code in my model for <code>afterSave</code> that would subtract the source source_id, but it always did this even when I wasn't even changing the <code>source_id</code>. (So the count went negative).</p> <p>My question: Is there a way to tell if a field was changed in the model in <code>CakePHP</code>?</p>
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