It runs the beforeSave() function, which your model can implement if
you want to check what is about to be saved, and either modify the
data before saving, deny the save completely, or of course allow the
save to continue.  By default there is a stub implementation in your /
cake/libs/model/model.php, which always returns true (so every save
can continue).  You must have a beforeSave() defined either in your
app/app_model.php, in your actual model class in app/models, or in a
behaviour that your model implements that is returning false, stopping
the save.


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