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    <p>Just a reminder: the <code>reorder()</code> method from the Tree behavior only modifies the <strong>left</strong> and <strong>right</strong> fields of a tree following <a href="http://www.sitepoint.com/hierarchical-data-database-2/" rel="nofollow">MPTT logic</a> (which is the type of tree used by this behavior). It does not make all <code>find()</code> in that model magically deliver the order defined by your <code>reorder()</code> method. You still need to pass an <code>order</code> parameter in the <code>find()</code> options to actually use the updated left and right values.</p> <p>Suppose you are using the default column names used by TreeBehavior: <code>lft</code> for the <strong>left</strong> field and <code>rght</code> for the <strong>right</strong> field. After running once the <code>reorder()</code> method given in the question, to get the ordered data from your Model to pass to your View, you would use something like:</p> <pre><code>$this-&gt;Category-&gt;find('all', array( 'order' =&gt; array( 'Category.lft' =&gt; 'ASC' ) )); </code></pre> <p>Of course replacing the <code>find</code> type if you want to use something else than <code>'all'</code>.</p> <p>Ordering by <code>Category.lft</code> will in fact show you the order you would get by making a depth-first search, left to right - not an arbitrary order defined by the database like would happen if you had no <code>order</code> parameter, or if you used a simple <code>'order' =&gt; 'Category.name'</code> in the <code>find</code> options which would ignore the tree structure.</p> <p>P.S.: I know the question is 2 years old, but since nobody else explained what <code>reorder()</code> <em>actually</em> does, I think this would be useful.</p>
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    1. POTree Behavior : how to quickly reorder existing data by a certain field?
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    1. USGeorge Bezerra
    1. USGeorge Bezerra
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    1. COIt's always a good idea to answer an old question with a possible resolution +1
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      1. USlegrandviking
    2. COI'm not sure what this answer is trying to say. The question asks how to change the lft+rght values "so that my index view is ordered correctly" I.e so that the category index, when rendered as a hierachial tree (I assume), is in alphabetical order. The right way to do that is the code that's in the question (yes, the question). This answer is going to show the data in whatever order it appears in the database which, given there was a question about changing it, isn't what the author wanted.
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    3. COIndeed, the question is reordering the tree alright, but the original poster said nothing was happening - probably because he tried passing the data to a View and saw no difference at all. My answer was about how to actually make that reorder reflect in the View, after reordering the way that is described in the question. I will edit my answer to make my point clearer.
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