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POUnable to Save BelongsTo Data Using Checkboxes in CakePHP
 

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    <p>I have two models with the relationship <code>Advisor belongsTo Room</code>, <code>Room hasMany Advisor</code>. <code>Advisor</code> has a foreignKey constraint in the database (<code>Advisor.room_id</code>) which points to a specific room. The default value for this is the <code>NULL</code> value (representing an advisor without a room).</p> <p>Suppose I had an <code>Advisor</code>, with <code>room_id</code> set to <code>n</code>. I now wish to unassign the the <code>nth</code> room from <code>Advisor</code> - using a select field, I can reset <code>room_id</code> to <code>NULL</code>, with the following <code>request-&gt;data</code> structure:</p> <pre><code>[Room] =&gt; Array ( [name] =&gt; TestRoom2 [type] =&gt; single suite [id] =&gt; 4 ) [Advisor] =&gt; Array ( [0] =&gt; Array ( [id] =&gt; 14 [room_id] =&gt; [name] =&gt; foo ) ) </code></pre> <p>However, when I attempt to do this through the use of checkboxes with the same generated <code>$this-&gt;request-&gt;data</code>, MySQL refuses to update the <code>NULL</code> value.</p> <p>In addition, it seems that changing the value of <code>room_id</code> explicitly in <code>request-&gt;data</code> in the second case has no effect. However, if I were to change <code>Advisor.0.name</code> to <code>hax</code>, (by modifying <code>request-&gt;data</code> directly) the <code>name</code> field <em>does</em> save.</p> <p>I save via calling <code>$this-&gt;Room-&gt;saveAll($request-&gt;data, array('deep' =&gt; true))</code> - this is true both in the case of the select field and the checkbox.</p> <p>I am generating the series of checkboxes by repeatedly calling the <code>Form</code> helper:</p> <pre><code>$count = 0; // $key is the Advisor id, and $attributes is an array of the form // array('name' =&gt; (string), 'disabled' =&gt; (bool)) foreach($options['advisorList'] as $key =&gt; $attributes) { $form[] = $this-&gt;Form-&gt;hidden(sprintf('Advisor.%s.id', $count), array('value' =&gt; $key)); $form[] = $this-&gt;Form-&gt;input(sprintf('Advisor.%s.room_id', $count), array( 'type' =&gt; 'checkbox', 'label' =&gt; $attributes['name'], 'disabled' =&gt; $attributes['disabled'])); $count++; } </code></pre> <p><em>Moreover</em>, if <code>room_id</code> has already been set to <code>NULL</code>, there is no problem setting <code>room_id</code> - except, <code>room_id</code> will be set regardless if the checkbox is checked or not.</p> <p>Any help would be greatly appreciated - thanks!</p>
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