更新记录category_id = 0

Question

I set category_id to 0 and category id is auto increment. so I update this record in cakephp then cakephp will insert this record insted of update this record.

$this->Category->id=$id;
$this->Category->save($this->data);

Pls help me...

Answer 1

An Id of 0 is invalid

There's an implicit assumption with CakePHP that all identifiers are truthy:

/**
 * Returns the current record's ID
 *
 * @param integer $list Index on which the composed ID is located
 * @return mixed The ID of the current record, false if no ID
 */
public function getID($list = 0) {
    if (empty($this->id) || ...) {
        return false;
    }
    ...

as such trying to save with an id of 0 will not work, causing Cake to attempt an insert even if a row exists with that falsey id.

Answer 2

Not sure if I understand you correctly, but if you want to update ALL records WHERE category_id=0 then this code would be effecient:

$this->Category->updateAll(
    $this->data,
    array('Category.category_id' => 0)
);

Answer 3

Cakephp will update record if id is greater then 0 other wise it insert new record. So try to change id 0 to greater than 0. Try this.