Sorry for the delayed response, the working validation role that I
used was
var $validate = array(
'Role' => array(
'rule' => array('multiple', array('min'=>1)),
'message' => 'Select one or more roles'
)
);
This works with my RolesStaff model with form fields using the format
of:
data[Role][Role][]
This is all as per the standard conventions of cake ... the main
problem I found was that saveAll() does not validate HABTM models
before saving. I had to add a hack to get it to do so, see above.
I would not recommend my hack as I very much doubt it's the right way
to do it, even though it works. I was hoping someone more
knowledgeable than me would join in the thread to shed some light on
the saveAll -> HABTM -> validation issue.
HTH, Paul (Webbed IT)
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