Unable to change value at edit time with codeIgniter validation - php

Question

Here i have a list of categories and user can add a new category as well as edit them.
Now at the edit time i'm using server-side validation by codeigniter for reduce redundancies . but the issue is the, whenever i edit an existing category then it can't update it because it compare with their original value, that is wrong. i trying to many time but unable to fix this issue.
Here is my code
public function category_upd()
{
extract($_POST);
$userId = $this->session->userdata('id');
$original_value = $this->db->query("SELECT cat_name FROM category WHERE user_id=".$userId." and cat_name ='".$_POST['cat_name']."'") ;
$original_value = $original_value->result_array();
$original_value = $original_value[0]['cat_name'];
$original_value2 = $this->db->query("SELECT cat_name FROM category WHERE user_id=".$userId." and cat_name ='".$_POST['cat_name']."'") ;
$original_value2 = $original_value2->result_array();
$original_value2 = $original_value2[0]['cat_name'];
if(ucwords($_POST['cat_name']) != $original_value) {
$this->session->set_flashdata('cat_failed','Category must be unique.');
$is_unique = '|is_unique[category.cat_name]';
} else if(ucwords($original_value2 == "")){
echo "go";
exit;
$this->session->set_flashdata('cat_failed','Category must be unique.');
$is_unique = '|is_unique[category.cat_name]';
} else {
$is_unique = '';
}
$this->form_validation->set_rules('cat_name','Category','trim|required'.$is_unique);
if($this->form_validation->run() ) {
A snap with error
I need your kind efforts. Thanks

Answer 1

Set validation Rules like this and you need to pass category id value
$this->form_validation->set_rules('cat_name', 'cat_name', 'required|trim|edit_unique[category.category_name.' . $_POST['category_id'].'.'.$_POST['user_id']. ']', array('edit_unique' => 'Category must be unique.'));
And developed one function edit_unique on Form_validation.php like this
Filepath system/libraries/Form_validation.php
public function edit_unique($str, $field)
{
sscanf($field, '%[^.].%[^.].%[^.].%[^.]', $table, $field,$id, $field2);
return isset($this->CI->db)
? ($this->CI->db->limit(1)->get_where($table, array($field => $str, 'id !=' => $id,'user_id'=>$field2))->num_rows() === 0)
: FALSE;
}

Answer 2

Check category name is alredy in database.
$newcategoryName=$this->input->post('category');
$query = $this->db->get_where('category', array('cat_name' => $newcategoryName,'user_id' => $userId));
$val=$query->result_array();
$original_value = $val[0]['cat_name'];
if($newcategoryName != $original_value) {
$is_unique = '|is_unique[users.EMAIL]';
} else {
$is_unique = '';
}
$this->form_validation->set_rules('cat_name', 'Category', 'required|trim|xss_clean'.$is_unique);