> triggered? And how can i avoid it without changing the cakecore?

set the 'rule' key on $validate for each field, and specify the rule
you want it to follow, when a validation
scheme is set on $validate but no rule is specified, the 'blank' rule
is assumed.
Please refer to the cookbook for more information on validation, we
got lots of information there.
btw, your TRUE shouldn't be enclosed in an array, it should be "
'required' => true ".

> $this->exists();
> What effect does this call have in this context? As far as i see, the
> call returns a boolean to the void o_O ?

Model::exists() caches the returned value in a private var - Model::
$__exists - and that's the used in the rest of the method to test the
record existence.
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