#27267: Migrations: Need API to drop a foreign key constraint
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Reporter: Melvyn Sopacua | Owner: nobody
Type: Uncategorized | Status: new
Component: Migrations | Version: 1.10
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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Changes (by Simon Charette):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Comment:
Dropping a foreign key from from a field should be done automatically if
you convert the field to it's underlying datatype.
For example, if you have a foreign key pointing to a `CharField` named
`foo` replacing the `ForeignKey` by a `CharField` should be detected as an
`AlterField` operation when running `makemigrations`. The `AlterField`
operation should take care of dropping the constraint on `migrate`.
For example given these initial models.
{{{#!python
class Foo(models.Model):
id = models.CharField(max_length=20, primary_key=True)
class Bar(models.Model):
foo = models.ForeignKey(Foo)
}}}
Changing your definitions to
{{{#!python
class Foo(models.Model):
pass # Will use an implicit AutoField
class Bar(models.Model):
foo = models.CharField(max_length=20)
}}}
Running `makemigrations` should generate a field with an operation similar
to
{{{#!python
AlterField('Bar', 'foo', models.CharField(max_length=20))
}}}
And running the migration containing this operation should drop the
foreign key constraint.
--
Ticket URL: <https://code.djangoproject.com/ticket/27267#comment:1>
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