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    <p>When using callbacks, you can refer to the <a href="http://api.cakephp.org/classes" rel="nofollow noreferrer">API</a> for the class you are extending to check the parameters it accepts. Your implementation should accept, at minimum, the same parameters as the methods you are overriding.</p> <p>For example, <a href="http://api.cakephp.org/class/model#method-ModelbeforeDelete" rel="nofollow noreferrer"><code>Model::beforeDelete</code></a> is implemented like so:</p> <pre><code>/** * Called before every deletion operation. * * @param boolean $cascade If true records that depend on this record will also be deleted * @return boolean True if the operation should continue, false if it should abort * @link http://book.cakephp.org/2.0/en/models/callback-methods.html#beforedelete */ public function beforeDelete($cascade = true) { return true; } </code></pre> <p>And also, <a href="http://api.cakephp.org/class/model-behavior#method-ModelBehaviorbeforeDelete" rel="nofollow noreferrer"><code>ModelBehavior::beforeDelete</code></a> is implemented like this (ie. when making a behavior):</p> <pre><code>/** * Before delete is called before any delete occurs on the attached model, but after the model's * beforeDelete is called. Returning false from a beforeDelete will abort the delete. * * @param Model $model Model using this behavior * @param boolean $cascade If true records that depend on this record will also be deleted * @return mixed False if the operation should abort. Any other result will continue. */ public function beforeDelete(Model $model, $cascade = true) { return true; } </code></pre> <p>Next, it is useful to know that when saving to a model and passing in the controller's data (ie. <code>$this-&gt;data</code> in the controller) that data is <a href="http://api.cakephp.org/class/model#method-Modelset" rel="nofollow noreferrer">set to the model</a> (ie. <code>$this-&gt;data</code> in the model). [This happens during <code>Model::save()</code>, currently on <a href="https://github.com/cakephp/cakephp/blob/c159854a172bf25cd4fd95765c7ea0d3305892e2/lib/Cake/Model/Model.php#L1623" rel="nofollow noreferrer">line 1225</a>.]</p> <p>In the case of the first example you can access the model using <code>$this</code> and in the second example you can access the model using <code>$model</code> (as <code>$this</code> would be the behavior in that context). So to get at the data, you want to use <code>$this-&gt;data</code> or <code>$model-&gt;data</code>. You can also access that model's related models using chaining (ie. <code>$this-&gt;RelatedModel</code> or <code>$model-&gt;RelatedModel</code>).</p> <p>As the docblock comments state, <code>$cascade</code> should let you know if this is a cascading delete that is happening (<code>true</code> by default) in case your code needs to take different actions when this is or isn't the case; and your implementation of the method should return false if you want to abort the save operation (otherwise, return true when you are done).</p> <p>There is a <a href="https://github.com/davidpersson/media" rel="nofollow noreferrer">Media plugin</a> for CakePHP which implements <a href="https://github.com/davidpersson/media/blob/a8db789e0ec767ee4f4ebf7af1a8c8df12768893/models/behaviors/coupler.php#L155-182" rel="nofollow noreferrer">this exact functionality</a> that can be used as a reference.</p>
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    1. COThanks so much, this is great info!
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    2. CONo problem. In reply to your edit, I tested your code at this end (on 1.3) and couldn't find a fault. It worked as expected, deleting only when there was a single dependent record. I would assign your `find('count')` call to a `$count` variable then `debug($count); die;` to determine if you are getting the expected return value.
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