is_unique for codeigniter form validation

Question

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

I\'m trying to submi

Answer 1

Simple Way

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

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;
}