#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: <https://code.djangoproject.com/ticket/30524#comment:1> Django <https://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To post to this group, send email to django-updates@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/068.6aae07dca151807adb1948de382b82a9%40djangoproject.com. For more options, visit https://groups.google.com/d/optout.