Validate HABTM

I have tried figuring this out on my own to no avail.

 

Where do I validate data being saved into a HABTM table? I have

USERS:

id

 

SYSTEMS:

id

name

 

USERS_SYSTEMS:

id

user_id

system_id

 

I created a simple form for the User to update their Systems but where is validation for this? Do I validate system_id in system model? Do I make a user_systems model and set a validation rule for system_id and user_id there? There is no system_id in the system model so it makes no sense to me to put it in there.  I made a user_systems model and put

var $validate = array(
  'system_id' => array('rule' => array('minLength', 8)) //min 8 just to check if it works as there are only single digit values in db
 );

but it still saves so I am at a loss....

 

Can someone point out what model do I use to validate the HABTM data being saved to the HABTM table?

 

thanks

 

Dave

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