$this->set('yourvar', $somedata)  will create a variable called
$yourvar in the view, with the passed data.  $this->data is model data
that is from/for a form - all of the FormHelper functions look at
$this->data to prepopulate from, and all the data they submit comes
into your controller under $this->data.

So basically, you should not have $this->set( 'data', $something ),
because it becomes confusing having a $data variable and $this->data,
which are quite different in scope and usage.


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