Re: [Django] #30524: on_delete doesn't work properly with MySql.

[Django]

#30524: on_delete doesn't work properly with MySql.
---+--
 Reporter:  dheeraj135 |Owner:  nobody
 Type:  Bug|   Status:  closed
Component:  Uncategorized  |  Version:  2.2
 Severity:  Normal |   Resolution:  invalid
 Keywords:  Foreign Key| Triage Stage:  Unreviewed
Has patch:  0  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+--
Changes (by Simon Charette):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 Django doesn't support database level foreign keys yet, this is tracked in
 #11964.

 The `models.CASCADE` value implements cascade deletion at the
 application/Python level in order to support signals.

-- 
Ticket URL: 
Django 
The Web framework for perfectionists with deadlines.

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Re: [Django] #30524: on_delete doesn't work properly with MySql.

[Django]

#30524: on_delete doesn't work properly with MySql.
---+--
 Reporter:  dheeraj135 |Owner:  nobody
 Type:  Bug|   Status:  new
Component:  Uncategorized  |  Version:  2.2
 Severity:  Normal |   Resolution:
 Keywords:  Foreign Key| Triage Stage:  Unreviewed
Has patch:  0  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+--
Changes (by dheeraj135):

 * keywords:  Foreign Key, indexes => Foreign Key


Old description:

> Model:
>
> {{{
> class Attempt(models.Model):
> student = models.ForeignKey(Student, models.CASCADE,
> related_name='quiz_attempts',null=False)
> quiz =
> models.ForeignKey(Quiz,on_delete=models.CASCADE,related_name='quiz_attempts')
> score = models.FloatField()
> over = models.BooleanField(default=False)
> date = models.DateTimeField(auto_now_add=True)
> currquestion =
> models.ForeignKey(Question,null=True,default=None,on_delete=models.SET_NULL)
>
> class Meta:
> indexes = [
> models.Index(fields=['student']),
> models.Index(fields=['quiz']),
> ]
>
> }}}
> Table created in MySql:
>
> {{{
> CREATE TABLE `classroom_attempt` (
>   `id` int(11) NOT NULL AUTO_INCREMENT,
>   `score` double NOT NULL,
>   `over` tinyint(1) NOT NULL,
>   `date` datetime(6) NOT NULL,
>   `currquestion_id` int(11) DEFAULT NULL,
>   `quiz_id` int(11) NOT NULL,
>   `student_id` int(11) NOT NULL,
>   PRIMARY KEY (`id`),
>   KEY `classroom_a_student_1a21bc_idx` (`student_id`),
>   KEY `classroom_a_quiz_id_eef64a_idx` (`quiz_id`),
>   KEY `classroom_attempt_currquestion_id_545301ef_fk_classroom`
> (`currquestion_id`),
>   CONSTRAINT `classroom_attempt_currquestion_id_545301ef_fk_classroom`
> FOREIGN KEY (`currquestion_id`) REFERENCES `classroom_question` (`id`),
>   CONSTRAINT `classroom_attempt_quiz_id_e227b203_fk_classroom_quiz_id`
> FOREIGN KEY (`quiz_id`) REFERENCES `classroom_quiz` (`id`),
>   CONSTRAINT `classroom_attempt_student_id_a4dc81cd_fk_classroom` FOREIGN
> KEY (`student_id`) REFERENCES `classroom_student` (`user_id`)
> ) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
> +---+-
> }}}
>
> As you can notice, indexes and models.CASCADE is not applied.

New description:

 Model:

 {{{
 class Attempt(models.Model):
 student = models.ForeignKey(Student, models.CASCADE,
 related_name='quiz_attempts',null=False)
 quiz =
 models.ForeignKey(Quiz,on_delete=models.CASCADE,related_name='quiz_attempts')
 score = models.FloatField()
 over = models.BooleanField(default=False)
 date = models.DateTimeField(auto_now_add=True)
 currquestion =
 models.ForeignKey(Question,null=True,default=None,on_delete=models.SET_NULL)

 class Meta:
 indexes = [
 models.Index(fields=['student']),
 models.Index(fields=['quiz']),
 ]

 }}}
 Table created in MySql:

 {{{
 CREATE TABLE `classroom_attempt` (
   `id` int(11) NOT NULL AUTO_INCREMENT,
   `score` double NOT NULL,
   `over` tinyint(1) NOT NULL,
   `date` datetime(6) NOT NULL,
   `currquestion_id` int(11) DEFAULT NULL,
   `quiz_id` int(11) NOT NULL,
   `student_id` int(11) NOT NULL,
   PRIMARY KEY (`id`),
   KEY `classroom_a_student_1a21bc_idx` (`student_id`),
   KEY `classroom_a_quiz_id_eef64a_idx` (`quiz_id`),
   KEY `classroom_attempt_currquestion_id_545301ef_fk_classroom`
 (`currquestion_id`),
   CONSTRAINT `classroom_attempt_currquestion_id_545301ef_fk_classroom`
 FOREIGN KEY (`currquestion_id`) REFERENCES `classroom_question` (`id`),
   CONSTRAINT `classroom_attempt_quiz_id_e227b203_fk_classroom_quiz_id`
 FOREIGN KEY (`quiz_id`) REFERENCES `classroom_quiz` (`id`),
   CONSTRAINT `classroom_attempt_student_id_a4dc81cd_fk_classroom` FOREIGN
 KEY (`student_id`) REFERENCES `classroom_student` (`user_id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
 +---+-
 }}}

 As you can notice models.CASCADE is not applied.

--

-- 
Ticket URL: 
Django 
The Web framework for perfectionists with deadlines.

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