#24934: Can't drop or change unique_together index in MySql ----------------------------+-------------------------------------- Reporter: user0007 | Owner: nobody Type: Bug | Status: new Component: Migrations | Version: 1.8 Severity: Normal | Resolution: Keywords: | Triage Stage: Unreviewed Has patch: 0 | Needs documentation: 0 Needs tests: 0 | Patch needs improvement: 0 Easy pickings: 0 | UI/UX: 0 ----------------------------+-------------------------------------- Description changed by user0007:
Old description: > Hello, > > I'm using Django 1.8.2 and Mysql 5.6. I created model with two fields in > unique_together: > > {{{ > user = models.ForeignKey(User) > product = models.ForeignKey(Product) > > class Meta: > unique_together = ('user', 'product') > }}} > > the table was created successfully with following indexes: > > {{{ > PRIMARY | 1 | id > myapp_mymodel_user_id_16c33dde7f7257bb_uniq | 1 | user_id > myapp_mymodel_user_id_16c33dde7f7257bb_uniq | 2 | product_id > myapp_mymodel_1ba366c5 | 1 | user_id > myapp_mymodel_9bea82de | 1 | product_id > }}} > > Later I removed unique_together from my model: > > {{{ > class Meta: > pass > }}} > > so Django generated a migration: > > {{{ > operations = [ > migrations.AlterUniqueTogether( > name='mymodel', > unique_together=set([]), > ), > ] > }}} > > but when i try to apply this migrattion I have got an error: > > {{{ > django.db.utils.OperationalError: (1061, "Duplicate key name > 'myapp_mymodel_1ba366c5'") > }}} > > Django is trying to create this index, instead of removed them. > > The same situation is when I try to add third field to my unique_together > list: > > {{{ > class Meta: > unique_together = ('user', 'product', 'category') > }}} > > {{{ > django.db.utils.OperationalError: (1061, "Duplicate key name > 'myapp_mymodel_1ba366c5'") > }}} New description: Hello, I'm using Django 1.8.2 and Mysql 5.6. I created model with two fields in unique_together: {{{ user = models.ForeignKey(User) product = models.ForeignKey(Product) class Meta: unique_together = ('user', 'product') }}} the table was created successfully with following indexes: {{{ PRIMARY | 1 | id myapp_mymodel_user_id_16c33dde7f7257bb_uniq | 1 | user_id myapp_mymodel_user_id_16c33dde7f7257bb_uniq | 2 | product_id myapp_mymodel_1ba366c5 | 1 | user_id myapp_mymodel_9bea82de | 1 | product_id }}} Later I removed unique_together from my model: {{{ class Meta: pass }}} so Django generated a migration: {{{ operations = [ migrations.AlterUniqueTogether( name='mymodel', unique_together=set([]), ), ] }}} but when i try to apply this migrattion I have got an error: {{{ django.db.utils.OperationalError: (1061, "Duplicate key name 'myapp_mymodel_1ba366c5'") }}} Django is trying to create this index, instead of removed them. The same situation is when I try to add third field to my unique_together list: {{{ class Meta: unique_together = ('user', 'product', 'category') }}} {{{ django.db.utils.OperationalError: (1061, "Duplicate key name 'myapp_mymodel_1ba366c5'") }}} PS. The table was created using Django 1.7.X but changes was made using Django 1.8.2 -- -- Ticket URL: <https://code.djangoproject.com/ticket/24934#comment:3> 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/066.f7b046bf0d6e37d2ba7efa0a252a19e3%40djangoproject.com. For more options, visit https://groups.google.com/d/optout.