解决：validation在model里使用, callback会出问题

itlong · 发表于 2008-6-11 10:50:04

一般教程上使用时，数据检测都是在controler里测试，可是MVC的原则就是数据处理的任务是交给model处理的，所以今天我在表单提交处理数据的时间，是在model里面处理：代码如下：
controller:

PHP复制代码

class Form extends Controller
{
function Form()
{
parent::Controller();
$this->load->helper(array('url', 'form'));
$this->load->model('form_model');
}
function index()
{
$this->load->view('myform');
}
function dosubmit()
{
$this->form_model->dosubmit();
}
}

复制代码

==============================================================
model:

PHP复制代码

class Form_model extends Model
{
function Form_model()
{
parent::Model();
$this->load->library('validation');
}
function dosubmit()
{
$rules['username'] = "callback_username_check";
$rules['password'] = "required";
$this->validation->set_rules($rules);
if ($this->validation->run() == false)
{
$this->load->view('myform');
}
else
{
return true;
}
}//end dosubmit

function username_check($str)
{
if($str=='test')
{
$this->validation->set_message('username_check', ' %s 不能为 "test"');
return false;
}
else
{
return true;
}
}//end username_check

}//end model

复制代码

===================================================================
myform:

HTML复制代码

<html>
<head>
<title>My Form</title>
<meta http-equiv="Content-Type" c />
</head>
<body>
<?=$this->validation->error_string; ?>
<?=form_open('form/dosubmit');?>
<input type="text" name="username"><br />
<input type="text" name="password"><br />
</form>
</body>
</html>

复制代码

===================================================
测试结果是：
当用户名username为“test”时，检测不出有错误　,password为空时可以检测出错误。
就是说明，在model里不能用到validation 的回调函数？？？

请高手指出问题所在。

itlong · 发表于 2008-6-11 11:23:43

在英文wiki上找了一下，终于找到了解决方法：
http://codeigniter.com/wiki/MY_V ... lbacks_into_Models/
方法是要扩展一下validation,文章好像在说，在比目前版本更高版本将来会更新。
做法如下：
model:

class Form_model extends Model
{
function Form_model()
{
      parent::Model();
      $this->load->library('validation');
}
function dosubmit()
{
　　$this->validation->set_rules(array(
         'username' => 'trim|required|callback_form_model->is_unique[username]',
         'password' => 'trim|required|matches[confirm]',
      ));
      $this->validation->set_rules($rules);
      if ($this->validation->run() == false)
      {
         $this->load->view('myform');
      }
      else
      {
         return true;
      }
   }//end dosubmit

function is_unique($value)
{
      if($value =='test')
      {
      $this->validation->set_message('form_mode->is_unique', ' The %s 不能为"rest"');
      return false;
      }
      else
         {
               return true;
         }
/*
$this->db->where($field,$value);
$this->db->from($this->_table);
return ($this->db->count_all_results() == 0);
*/这里是从数库里找出是否存在username这一记录。如果存在则返回false;
}

}//end model

itlong · 发表于 2008-6-11 11:25:32

//把下面代码存为application/libraries/MY_Validation.php
<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');

/**
* MY_Validation extension
*
* Allows callback functions into Models
*
* Usage:
* Pass the caller to the validation class
* $this->validation->run($this);
*
* Version 0.3 (c) Wiredesignz 2008-04-24
*/

class MY_Validation extends CI_Validation
{
function get_fields()
{
      return $this->_fields;
}

/**
   * Run the Validator
   *
   * This function does all the work.
   *
   * @access public
   * @return bool
   */
function run(&$parent = NULL)
{
      // Do we even have any data to process?  Hmm?
      if (count($_POST) == 0 OR count($this->_rules) == 0)
      {
         return FALSE;
      }

      isset($parent) OR $parent = $this->CI;

      // Load the language file containing error messages
      $parent->load->language('validation');

      // Cycle through the rules and test for errors
      foreach ($this->_rules as $field => $rules)
      {
         //Explode out the rules!
         $ex = explode('|', $rules);

         // Is the field required?  If not, if the field is blank  we'll move on to the next test
         if ( ! in_array('required', $ex, TRUE))
         {
            if ( ! isset($_POST[$field]) OR $_POST[$field] == '')
            {
                  continue;
            }
         }

         /*
         * Are we dealing with an "isset" rule?
         *
         * Before going further, we'll see if one of the rules
         * is to check whether the item is set (typically this
         * applies only to checkboxes).  If so, we'll
         * test for it here since there's not reason to go
         * further
         */
         if ( ! isset($_POST[$field]))
         {
            if (in_array('isset', $ex, TRUE) OR in_array('required', $ex))
            {
                  if ( ! isset($this->_error_messages['isset']))
                  {
                     if (FALSE === ($line = $parent->lang->line('isset')))
                     {
                        $line = 'The field was not set';
                     }
                  }
                  else
                  {
                     $line = $this->_error_messages['isset'];
                  }

                  // Build the error message
                  $mfield = ( ! isset($this->_fields[$field])) ? $field : $this->_fields[$field];
                  $message = sprintf($line, $mfield);

                  // Set the error variable.  Example: $this->username_error
                  $error = $field.'_error';
                  $this->$error = $this->_error_prefix.$message.$this->_error_suffix;
                  $this->_error_array[] = $message;
            }

            continue;
         }

         /*
         * Set the current field
         *
         * The various prepping functions need to know the
         * current field name so they can do this:
         *
         * $_POST[$this->_current_field] == 'bla bla';
         */
         $this->_current_field = $field;

         // Cycle through the rules!
         foreach ($ex As $rule)
         {
            // Is the rule a callback?
            $callback = FALSE;
            if (substr($rule, 0, 9) == 'callback_')
            {
                  $rule = substr($rule, 9);
                  $callback = TRUE;
            }

            // Strip the parameter (if exists) from the rule
            // Rules can contain a parameter: max_length[5]
            $param = FALSE;
            if (preg_match("/(.*?)\[(.*?)\]/", $rule, $match))
            {
                  $rule = $match[1];
                  $param = $match[2];
            }

// Call the function that corresponds to the rule
if ($callback === TRUE)
{
      /* Allows callbacks into Models */

      if (list($class, $method) = split('->', $rule))
      {
         if ( ! method_exists($parent->$class, $method))
         {
            continue;
         }

         $result = $parent->$class->$method($_POST[$field], $param);
      }
      else
      {
         if ( ! method_exists($parent, $rule))
         {
            continue;
         }

         $result = $parent->$rule($_POST[$field], $param);
      }

      /* Original code continues */

      // If the field isn't required and we just processed a callback we'll move on...
      if ( ! in_array('required', $ex, TRUE) AND $result !== FALSE)
      {
         continue 2;
      }
}
else
            {
                  if ( ! method_exists($this, $rule))
                  {
                     /*
                     * Run the native PHP function if called for
                     *
                     * If our own wrapper function doesn't exist we see
                     * if a native PHP function does. Users can use
                     * any native PHP function call that has one param.
                     */
                     if (function_exists($rule))
                     {
                        $_POST[$field] = $rule($_POST[$field]);
                        $this->$field = $_POST[$field];
                     }

                     continue;
                  }

                  $result = $this->$rule($_POST[$field], $param);
            }

            // Did the rule test negatively?  If so, grab the error.
            if ($result === FALSE)
            {
                  if ( ! isset($this->_error_messages[$rule]))
                  {
                     if (FALSE === ($line = $parent->lang->line($rule)))
                     {
                        $line = 'Unable to access an error message corresponding to your field name.';
                     }
                  }
                  else
                  {
                     $line = $this->_error_messages[$rule];
                  }

                  // Build the error message
                  $mfield = ( ! isset($this->_fields[$field])) ? $field : $this->_fields[$field];
                  $mparam = ( ! isset($this->_fields[$param])) ? $param : $this->_fields[$param];
                  $message = sprintf($line, $mfield, $mparam);

                  // Set the error variable.  Example: $this->username_error
                  $error = $field.'_error';
                  $this->$error = $this->_error_prefix.$message.$this->_error_suffix;

                  // Add the error to the error array
                  $this->_error_array[] = $message;

                  continue 2;
            }
         }

      }

      $total_errors = count($this->_error_array);

      /*
      * Recompile the class variables
      *
      * If any prepping functions were called the $_POST data
      * might now be different then the corresponding class
      * variables so we'll set them anew.
      */
      if ($total_errors > 0)
      {
         $this->_safe_form_data = TRUE;
      }

      $this->set_fields();

      // Did we end up with any errors?
      if ($total_errors == 0)
      {
         return TRUE;
      }

      // Generate the error string
      foreach ($this->_error_array as $val)
      {
         $this->error_string .= $this->_error_prefix.$val.$this->_error_suffix."\n";
      }

      return FALSE;
}
}

itlong · 发表于 2008-6-11 11:52:03

重要注意：
你在controller里$this->load->model('form_model');时，如果自己定义了一个名字，如“validmodel”，一定要保持model里：
==============================（以下是默认）===================================
　　$this->validation->set_rules(array(
         'username' => 'trim|required|callback_form_model->is_unique[username]',
         'password' => 'trim|required|matches[confirm]',
      ));
===================================================================
$this->validation->set_message(’form_model->is_unique‘, ' %s 不能为 "test"');
===================================================================

要改为：
　　$this->validation->set_rules(array(
         'username' => 'trim|required|callback_validmodel->is_unique[username]',
         'password' => 'trim|required|matches[confirm]',
      ));
===================================================================
$this->validation->set_message(’validmodel->is_unique‘, ' %s 不能为 "test"');
===================================================================

可以看出，在model 里，validation回调函数里是在contoller实例化时的对象函数。

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解决：validation在model里使用, callback会出问题

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