Code:
// The following rule has been "borrowed" from
// Bonfire application starter, http://cibonfire.com/
/**
* Checks that a value is unique in the database.
*
* i.e. '…|required|unique[users.name,users.id]|trim…'
*
* <code>
* "unique[tablename.fieldname,tablename.(primaryKey-used-for-updates)]"
* </code>
*
* @author Adapted from Burak Guzel <http://net.tutsplus.com/tutorials/php/6-codeigniter-hacks-for-the-masters/>
*
* @param mixed $value The value to be checked.
* @param mixed $params The table and field to check against, if a second
* field is passed in this is used as "AND NOT EQUAL".
*
* @return bool True if the value is unique for that field, else false.
*/
public function unique($value, $params)
{
// Allow for more than 1 parameter.
$fields = explode(',', $params);
// Extract the table and field from the first parameter.
list($table, $field) = explode('.', $fields[0], 2);
// Setup the db request.
$this->CI->db->select($field)
->from($table)
->where($field, $value)
->limit(1);
// Check whether a second parameter was passed to be used as an
// "AND NOT EQUAL" where clause
// eg "select * from users where users.name='test' AND users.id != 4
if (isset($fields[1])) {
// Extract the table and field from the second parameter
list($where_table, $where_field) = explode('.', $fields[1], 2);
// Get the value from the post's $where_field. If the value is set,
// add "AND NOT EQUAL" where clause.
$where_value = $this->CI->input->post($where_field);
if (isset($where_value)) {
$this->CI->db->where("{$where_table}.{$where_field} <>", $where_value);
}
}
// If any rows are returned from the database, validation fails
$query = $this->CI->db->get();
if ($query->row()) {
//$this->CI->form_validation->set_message('unique', lang('bf_form_unique'));
$this->CI->form_validation->set_message('unique', $this->CI->lang->line('form_validation_is_unique'));
return false;
}
return true;
}
