is_unique用于codeigniter表单验证

I'm trying to figure out how I can use the is_unique rule from the Codeigniter form validation library in the following situation.

我想弄清楚如何在以下情况下使用Codeigniter表单验证库中的is_unique规则。

I'm trying to submit a edit user form and have the rule:

我正在尝试提交编辑用户表单并具有以下规则：

$this->form_validation->set_rules('user_name', 'User Name', 'required|trim|xss_clean|is_unique[users.user_name]');

What if other values in the form are being changed but this value stays the same. The form is going to see that this value already exists so how would I protect it from editing if this value isn't changed.

如果表单中的其他值被更改但该值保持不变，该怎么办？表单将会看到此值已经存在，因此如果不更改此值，我将如何保护它不被编辑。

7 个解决方案

#1

Using your code as an example, the is_unique validation rule works by looking for a field called user_name in your users database table. If the field with the same value exists it validates as false.

使用您的代码作为示例，is_unique验证规则通过在您的users数据库表中查找名为user_name的字段来工作。如果存在具有相同值的字段，则验证为false。

To make sure it runs only when the user submits a new value, you could check the posted value $this->input->post('user_name') against the value you pulled from the database to populate your form with. If they are the same, don't validate is_unique;

要确保它仅在用户提交新值时运行，您可以根据从数据库中提取的值来检查已发布的值$ this-> input-> post（'user_name'）以填充表单。如果它们相同，则不要验证is_unique;

if($this->input->post('user_name') != $original_value) {
   $is_unique =  '|is_unique[users.user_name]'
} else {
   $is_unique =  ''
}

$this->form_validation->set_rules('user_name', 'User Name', 'required|trim|xss_clean'.$is_unique);

#2

There's a better way to go around it, I think, still using CodeIgniters' validation library... Use edit_unique where you pass an extra parameter which is the id of the row you're editing.. See below.. I use it and works pretty fine for me.. hope it helps

我认为还有一种更好的解决方法，仍然使用CodeIgniters的验证库...使用edit_unique，你传递一个额外的参数，这是你正在编辑的行的ID ..见下文..我用它和对我来说工作得很好..希望它有所帮助

$this->form_validation->set_rules('user_name', 'User Name', 'required|trim|xss_clean|edit_unique[users.user_name.'.$id.']');

#3

$something = $this->input->post('something');

$this->form->validation->set_rules('something','Something','xss_clean|is_unique['tbl'.users]');

if($this->form_validation->run()== FALSE){

}

#4

Here's an easy method that worked for me and uses well documented code (thanks to https://github.com/ivantcholakov for sharing it!). I found it referenced at https://github.com/bcit-ci/CodeIgniter/issues/3109#issuecomment-46346280

这是一个简单的方法，对我有用，并使用记录良好的代码（感谢https://github.com/ivantcholakov分享它！）。我发现它在https://github.com/bcit-ci/CodeIgniter/issues/3109#issuecomment-46346280引用

1. Download https://github.com/ivantcholakov/starter-public-edition-3/blob/master/platform/application/libraries/MY_Form_validation.php (MIT licensed) and save it to your application at application\libraries\MY_Form_validation.php
2. 下载https://github.com/ivantcholakov/starter-public-edition-3/blob/master/platform/application/libraries/MY_Form_validation.php(MIT许可）并将其保存到application \ libraries \ MY_Form_validation.php的应用程序中

3. Delete these two lines from __construct():

   从__construct（）中删除这两行：

   $this->CI->load->helper('checkbox'); $this->CI->load->helper('email');

   $这个 - > CI->负载>帮手（ '复选框'）; $这个 - > CI->负载>帮手（ '电子邮件'）;

4. Delete all the functions except __construct() and unique().

   删除除__construct（）和unique（）之外的所有函数。

5. At the end of the __construct() method of your controller add this line:

   在控制器的__construct（）方法的末尾添加以下行：

   $this->load->library('form_validation');

   $这 - >负载>库（ 'form_validation'）;

6. As per the documentation of the unique() method update your validation rule to add a "unique" rule like this (e.g. if you already have required and trim rules):

   根据unique（）方法的文档，更新验证规则以添加这样的“唯一”规则（例如，如果您已经有必需和修剪规则）：

   …|required|unique[tablename.fieldname,tablename.(primaryKey-used-for-updates)]|trim...

   ... |需要| [tablename.fieldname，表名（PrimaryKey的使用的换更新）]独特|修剪...

#5

Extend Form_validation.php library create class inside of application/libraries file name MY_Form_validation.php

在应用程序/库文件名MY_Form_validation.php中扩展Form_validation.php库create class

<?php

class MY_Form_validation extends CI_Form_validation{
    protected $ci;
     public function __construct($config = array()){
                parent::__construct($config);
                $this->ci =& get_instance();
        }

                public function is_unique_update($str, $field){
                $explode=explode('@', $field);
                $field_name=$explode['0'];
                $field_id_key=$explode['1'];
                $field_id_value=$explode['2'];
                sscanf($field_name, '%[^.].%[^.]', $table, $field_name);

                 if(isset($this->ci->db)){
                        if($this->ci->db->limit(1)->get_where($table, array($field_name => $str,$field_id_key=>$field_id_value))->num_rows() === 0){
                             $this->ci->form_validation->set_message('is_unique_update', 'The {field} field must contain a unique value.');
                            return false;
                        }
                        return true;
                    }


            }
}  

Now in your controller

现在在您的控制器中

$this->form_validation->set_rules('user_name', 'User Name', 'required|trim|xss_clean|is_unique_update[users.user_name@id@'.$id.']');  

"@" I used for explode the string
where id is primary key of users table
and $id is the value of id. Now you can use this is_unique_update validation in any controller.

“@”我用于爆炸字符串，其中id是users表的主键，$ id是id的值。现在，您可以在任何控制器中使用此is_unique_update验证。

#6

we must have to add table name for is_unique

我们必须为is_unique添加表名

for Exp.

为Exp。

 is_unique[users.email]

#7

Simple Way

简单的方法

Just Change isset to is_object in system/libraries/form_validation.php

只需将更改设置为system / libraries / form_validation.php中的is_object

public function is_unique($str, $field)
{
    sscanf($field, '%[^.].%[^.]', $table, $field);
    return is_object($this->CI->db) //default isset
        ? ($this->CI->db->limit(1)->get_where($table, array($field => $str))->num_rows() === 0)
        : FALSE;
}