Sistema reglas validación multi-form

gistfile1.php

<?php

class MY_Model extends CI_Model {
	
	// Form validation rules
	protected $rules;
	
	// Sets form validation rules
	protected function set_rules($field_name)
	{
		if (is_string($field_name) && array_key_exists($field_name, $this->rules))
		{
			$this->form_validation->set_rules($field_name, $this->rules[$field_name]['label'], $this->rules[$field_name]['rules']);	
		}
		else if (is_array($field_name))
		{
			foreach ($field_name as $fname)
			{
				if (array_key_exists($fname, $this->rules))
				{
					$this->form_validation->set_rules($fname, $this->rules[$fname]['label'], $this->rules[$fname]['rules']);
				}
			}
		}
	}
}




class Brand_model extends MY_Model
{
	// Form validation rules
	protected $rules = array(
		'name' => array('label' => 'lang:company_name', 'rules' => 'trim|required'),
		'email' => array('label' => 'lang:email', 'rules' => 'trim|required|valid_email'),
		'vat_number' => array('label' => 'lang:vat_number', 'rules' => 'trim|required|valid_vat_number'),
		'logo' => array('label' => 'lang:logo', 'rules' => ''), // File
		'country_id' => array('label' => 'lang:country', 'rules' => 'trim|required|external_callbacks[common,is_country]'),
		'state_id' => array('label' => 'lang:state', 'rules' => 'trim|required|external_callbacks[common,is_state]'),
		'website' => array('label' => 'lang:website', 'rules' => 'trim|valid_url'),
		'facebook_page' => array('label' => 'lang:facebook_page', 'rules' => 'trim|valid_url'),
		'twitter_page' => array('label' => 'lang:twitter_page', 'rules' => 'trim|valid_url')
	);
	
	// Podrían crearse tb en el constructor usando $this->rules = array(...)
	
	
	public function validate_company_info()
	{
		// File validation rules & file uploading
		$logo_config = base64_encode(serialize(array(
			'field_name' => 'logo',
			// CI upload config
			'upload_path' => WEBPATH . 'data/logo/',
			'allowed_types' => 'png|gif|jpg|jpeg',
			'max_size' => 1024 / 2, // 0.5 Mb
			'encrypt_name' => TRUE
		)));
		
		// Incluso si necesitas pasar parametros dinamicamente, es posible.
		$this->rules['logo']['rules'] = 'external_callbacks_nopost[common_model,upload,'.$logo_config.']';
		
		// Set validation rules
		$this->set_rules(array('name', 'email', 'vat_number', 'logo'));
	
		return $this->form_validation->run();
	}
}