The problem is here:

        function view($id)
        {
                $this->set('data', $this->Category->read());
        }

You aren't passing the $id to read.  The line should read either:
$this->set('data', $this->Category->read(null, $id));
or, my personal favorite:
$this->set('data', $this->Category->findById($id));


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