#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
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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:
>
> {{{
> class Meta:
> unique_together = ('user', 'product')
> }}}
>
> the table was created successfully. Later I removed unique_together from
> my model:
>
> {{{
> class Meta:
> pass
> }}}
>
> so Django created 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'")
}}}
--
--
Ticket URL: <https://code.djangoproject.com/ticket/24934#comment:2>
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