#33709: Primary key of m2m tables is not migrated to BigAutoField
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Reporter: Jeremy Lainé | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 3.2
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 Jeremy Lainé:
Old description:
> I am trying to upgrade an existing application's models to use only
> "bigint" primary keys on postgresql. To do this I changed
> DEFAULT_AUTO_FIELD to BigAutoField, generated the migrations then applied
> them.
>
> The tables for my explicitly defined models get upgraded correctly. The
> many-to-many intermediate tables on the other hand still have an
> "integer" primary key, with the 32bit limit I'm trying to avoid.
>
> The following model are sufficient to reproduce the issue:
>
> ```
> class Book(models.Model):
> name = models.CharField(max_length=255)
> tags = models.ManyToManyField("Tag")
>
> class Tag(models.Model):
> name = models.CharField(max_length=255)
> ```
>
> The resulting schema for the testapp_book_tags looks like:
>
> ```
> test=> \d testapp_book_tags;
> Table "public.testapp_book_tags"
> Column | Type | Collation | Nullable | Default
> ---------+---------+-----------+----------+-----------------------------------------------
> id | integer | | not null |
> nextval('testapp_book_tags_id_seq'::regclass)
> book_id | bigint | | not null |
> tag_id | bigint | | not null |
> ```
New description:
I am trying to upgrade an existing application's models to use only
"bigint" primary keys on postgresql. To do this I changed
DEFAULT_AUTO_FIELD to BigAutoField, generated the migrations then applied
them.
The tables for my explicitly defined models get upgraded correctly. The
many-to-many intermediate tables on the other hand still have an "integer"
primary key, with the 32bit limit I'm trying to avoid.
The following model are sufficient to reproduce the issue:
{{{
class Book(models.Model):
name = models.CharField(max_length=255)
tags = models.ManyToManyField("Tag")
class Tag(models.Model):
name = models.CharField(max_length=255)
}}}
The resulting schema for the testapp_book_tags looks like:
{{{
test=> \d testapp_book_tags;
Table "public.testapp_book_tags"
Column | Type | Collation | Nullable | Default
---------+---------+-----------+----------+-----------------------------------------------
id | integer | | not null |
nextval('testapp_book_tags_id_seq'::regclass)
book_id | bigint | | not null |
tag_id | bigint | | not null |
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/33709#comment:1>
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