Skip to content

Loading…

DDC-2524: Wrong commit order with cascade remove and double association #3247

Closed
doctrinebot opened this Issue · 12 comments

2 participants

@doctrinebot

Jira issue originally created by user mnapoli:

We have stumbled upon a bug in a situation where a class A has the following associations to a class B:

  • A has one B (oneToOne unidirectional)
  • A has many B (oneToMany bidirectional)

Associations are with cascade remove.

We will submit a PR soon with a failing test case.

The failure is a MySQL foreign key violation exception when removing A (removals for B are executed after removals for A).

@doctrinebot

Comment created by valentin:

Here a link to the pull request #707

@doctrinebot

Comment created by mnapoli:

The tests on Travis are failing as expected.

https://travis-ci.org/doctrine/doctrine2/builds/8382962

Here is the list of the queries executed for MySQL:

SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`doctrine*tests`.`CascadeRemoveOrderEntityG`, CONSTRAINT `FK_23681E8F99938CE5` FOREIGN KEY (`ownerO*id`) REFERENCES `CascadeRemoveOrderEntityO` (`id`))

With queries:

13. SQL: 'DELETE FROM CascadeRemoveOrderEntityO WHERE id = ?' Params: '1'
12. SQL: '"START TRANSACTION"' Params: 
11. SQL: 'SELECT t0.id AS id1, t0.ownerO*id AS ownerO_id2 FROM CascadeRemoveOrderEntityG t0 WHERE t0.ownerO*id = ?' Params: '1'
10. SQL: 'SELECT t0.id AS id1, t0.oneToOneG*id AS oneToOneG*id2 FROM CascadeRemoveOrderEntityO t0 WHERE t0.id = ?' Params: '1'
9. SQL: '"COMMIT"' Params: 
8. SQL: 'INSERT INTO CascadeRemoveOrderEntityG (ownerO_id) VALUES (?)' Params: '1'
7. SQL: 'INSERT INTO CascadeRemoveOrderEntityO (oneToOneG_id) VALUES (?)' Params: ''
6. SQL: '"START TRANSACTION"' Params: 

As you can see, the latest query causes a foreign key constraint violation (wrong order with the next, non-executed query).

@doctrinebot

Comment created by mnapoli:

On the sqlite tests we can see better the order the queries are executed:

14. SQL: 'DELETE FROM CascadeRemoveOrderEntityG WHERE id = ?' Params: '1'
13. SQL: 'DELETE FROM CascadeRemoveOrderEntityO WHERE id = ?' Params: '1'
12. SQL: '"START TRANSACTION"' Params: 
11. SQL: 'SELECT t0.id AS id1, t0.ownerO*id AS ownerO_id2 FROM CascadeRemoveOrderEntityG t0 WHERE t0.ownerO*id = ?' Params: '1'
10. SQL: 'SELECT t0.id AS id1, t0.oneToOneG*id AS oneToOneG*id2 FROM CascadeRemoveOrderEntityO t0 WHERE t0.id = ?' Params: '1'
9. SQL: '"COMMIT"' Params: 
8. SQL: 'INSERT INTO CascadeRemoveOrderEntityG (ownerO_id) VALUES (?)' Params: '1'
7. SQL: 'INSERT INTO CascadeRemoveOrderEntityO (oneToOneG_id) VALUES (?)' Params: ''
6. SQL: '"START TRANSACTION"' Params: 

13 and 14 are in the wrong order.

@doctrinebot

Comment created by @guilhermeblanco:

This situation is not supported and cannot be resolved within current Doctrine code.
You created a circular dependency between the entities A and B. It happened because A contains one B (oneToOne) and because B contains a pointer to A as part of oneToMany association.
That way, you'll always have a foreign key constraint issue from RDBMS, no matter which entity you try to remove first.

Because of that, I'mm marking this ticket as "can't fix".

@doctrinebot

Comment created by mnapoli:

[~guilhermeblanco] I see what you mean, but the case we submitted is with a nullable foreign key. So the operation is permitted by the RDBMS.

A has one B (nullable oneToOne), and B has a pointer to A (manyToOne, not nullable).

As I said for the query log, B should be removed first, which is not the case (see above, line 13 and 14 should be inversed).

So this is fixable on the Doctrine side if I'm not mistaken.

@doctrinebot

Comment created by @beberlei:

[~matthieu] is this fixed with your DDC-2775 PR?

@doctrinebot

Comment created by mnapoli:

Just for clarity (I answered this question in the pull request): no this is not fixed (see #707 (comment)).

@doctrinebot

Comment created by benjamin:

Just encountered what I believe to be the same bug, without any kind of circular dependency:

class A {
    /****
     * @ORM\OneToMany(targetEntity="B", mappedBy="a", indexBy="x", cascade={"all"}, orphanRemoval=true)
     */
    private $b;

    ...
}

class B {
    /*
     * @ORM\ManyToOne(targetEntity="A", inversedBy="b")
     * @ORM\JoinColumn(name="aid", referencedColumnName="id", nullable=false, onDelete="CASCADE")
     */
    private $a;

    ...
}

The following operations in A:

$this->b->clear();
$this->b->add(new B());

Result in the following SQL commands:

INSERT INTO B ...
DELETE FROM B ...

This is always the wrong commit order, and is doomed to fail when you have unique constraints in the B table.

@doctrinebot

Comment created by makm:

Another situation without circular dependency:

class Entity
{
    /****
     * @ORM\OneToMany(targetEntity="Picture", mappedBy="entity", fetch="EXTRA_LAZY", cascade={"all"}, orphanRemoval=true)
     * @ORM\OrderBy({"position" = "ASC"})
     */
    protected $pictures = array();
} 

class Pictures {
    /****
     * @ORM\Column(type="string", length=1024, unique = true)
     */
    protected $file;
}
$hotel->setPictures($picturesArray);
$em->flush();
$hotel->getPictures()->clear();
$hotel->setPictures($somePictureUpdatedArray);
$em->flush();
Unique violation: 7 ERROR:  duplicate key value violates unique constraint "uniq_8f7c2fc08c9f3610"

Why we can't invoke entity deletions method (executeDeletions, UnitOfWork#commit) before executeInserts?
https://github.com/doctrine/doctrine2/blob/master/lib/Doctrine/ORM/UnitOfWork.php#L385-L388
There is another way?

@doctrinebot

Comment created by @doctrinebot:

A related Github Pull-Request [GH-707] was labeled:
#707

@doctrinebot

Comment created by @doctrinebot:

A related Github Pull-Request [GH-707] was closed:
#707

@doctrinebot

Issue was closed with resolution "Fixed"

@doctrinebot doctrinebot added this to the 2.6.0 milestone
@doctrinebot doctrinebot closed this
@doctrinebot doctrinebot added the Bug label
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Something went wrong with that request. Please try again.