model validate

<?php

class ArtObj extends Eloquent {
    
     
     protected $table = 'art_objects';
 public $primaryKey = 'object_id';
          
       public $timestamps = false;
     
        
               private  $rules = array('object_title' => 'required|' ,
             
                     'desc' => 'required',
                     'catalog' => 'required',
                     
                   'collection' => 'required',
                   'date_made'=> 'required',
                   'author' => 'required',
                   'place_made' => 'required',
                   'datasource' => 'required',
                   'measurements' => 'required'
                   
                     );
         
           private $messages = array(
                   'object_title.required' => 'The Titile field is required.',
                    'desc.required' => 'The Description field is required.',
               'catalog.required' => 'The Catalog field is required.',
               'collection.required' => 'The Collections field is required.',
               'date_made.required' => 'The Date Made field is required.',
               'author.required' => 'The Author field is required.',
               'place_made.required' => 'The Place Made field is required.',
               'datasource.required' => 'The Datasource field is required.',
               'measurements.required' => 'The measurements field is required.'
               
               );  
           
    private $errors;
   
        public function validate($data)
    {
        // make a new validator object
        $v = Validator::make($data, $this->rules , $this->messages);

        // check for failure
        if ($v->fails())
        {
            // set errors and return false
            $this->errors = $v->errors();
            return false;
        }

        // validation pass
        return true;
    }

    public function errors()
    {
        return $this->errors;
    }
     
  public function Objgroup()
  {
    return $this->belongsTo('Obj_group', 'obj_group_id', 'tour_object_id');
    
  }
  
    public function ObjCollection()
  {
    return $this->belongsTo('ObjCollection', 'obj_group_id');
    
  }
  
    public function medias()
  {
    return $this->hasMany('Media','parent_id','object_id');
    
  }
  
  
}