AssignmentTable Validator

gistfile1.php

    public function validationDefault(Validator $validator) {

        return $validator
            ->validatePresence('role_id')
            ->notEmpty('role_id', 'A role is required')
            ->add('role_id', [
                'unique' => [
                    'rule' => function($value, $context){
                        //debug($context);
                        return $context['data']['isUnique'];
                    },
                    'message' => 'The role you have selected has reached its maximum assignments.'
                ]
            ])
            ->validatePresence('venue_id')
            ->allowEmpty('venue_id')
            ->add('venue_id', [
                'validVenue' => [
                    'rule' => function($value, $context){
                        return $context['data']['validVenue'];
                    },
                    'message' => 'The role you have selected must have a venue assigned to it.'
                ],
                'properVenue' => [
                    'rule' => function($value, $context){
                        return $context['data']['properVenue'];
                    },
                    'message' => 'The role you have selected cannot have a venue assigned to it.'
                ],
            ])
            ->notEmpty('member_id', 'A member is required')
            ->notEmpty('domain_id', 'A domain is required')
            ;
    }