zend framework2 - Check for unique constraint violation -


i have 2 fields on entity form unique constraint: fielda , fieldb, mapped database columns field_a , field_b, respectively.

my input filter requires both of fields:

public function init() {     parent::init();      $this->add([         'name' => 'field_a',         'required' => true,         'allow_empty' => false,     ]);      $this->add([         'name' => 'field_b',         'required' => true,         'allow_empty' => false,     ]); }

i trying figure out best way validate 2 fields unique in database table. input filter fail validation if there different entity same field values.

i thinking override isvalid function , put custom logic in there.

i suggest use callback validator ( zend\validator\callback ) on both fields , put custom logic in callback function.

i use inputfilter add filters , validators form fields can implement inputfilterproviderinterface directly in form/fieldset class.

use zend\inputfilter\inputfilter;  class formfilter extends inputfilter {      public function __construct()     {        $this->add(         array(             'name' => 'field_a',             'filters' => array(),             'validators' => array (                 array(                     'name' => 'zend\validator\callback',                     'options' => array(                         'messages' => array(                                 \zend\validator\callback::invalid_value => 'custom message',                         ),                         'callback' => array($this,'validatefielda'),                     ),                 ),               )         )        );        $this->add(         array(             'name' => 'field_b',             'filters' => array(),             'validators' => array (                 array(                     'name' => 'zend\validator\callback',                     'options' => array(                         'messages' => array(                                 \zend\validator\callback::invalid_value => 'custom message',                         ),                         'callback' => array($this,'validatefieldb'),                     ),                 ),               )         )        );      }      public function validatefielda($value, $context)     {         // $value contains field_a value         // $context['field_b'] contains field_b value          // put custom logic here         // return true if fields unique          // return false if fields not unique     }      public function validatefieldb($value, $context)     {           ....     }   }

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