#25817: Unable to rename a field reference in foreign key 'to_field'
---------------------------------+--------------------------------------
Reporter: snopoke | Owner: nobody
Type: Uncategorized | Status: new
Component: Migrations | Version: 1.7
Severity: Normal | Resolution:
Keywords: to_field rename | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
---------------------------------+--------------------------------------
Changes (by snopoke):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Comment:
As a workaround I was able to use the following custom migration:
{{{#!python
operations = [
migrations.RunSQL(
'ALTER TABLE form_processor_bar RENAME COLUMN bar_id TO
external_id',
'ALTER TABLE form_processor_bar RENAME COLUMN external_id TO
bar_id',
state_operations=[
migrations.RenameField(
model_name='bar',
old_name='bar_id',
new_name='external_id',
),
migrations.AlterField(
model_name='bazz',
name='bar',
field=models.ForeignKey(to='form_processor.Bar',
to_field=b'external_id'),
preserve_default=True,
),
]
)
]
}}}
However this migration is un-sqaushable:
{{{
$ ./manage.py squashmigrations form_processor 0002
Will squash the following migrations:
- 0001_initial
- 0002_rename_bar_id_to_external_id
Do you wish to proceed? [yN] y
Optimizing...
Traceback (most recent call last):
File "./manage.py", line 73, in <module>
execute_from_command_line(sys.argv)
File "/home/skelly/.virtualenvs/hq/local/lib/python2.7/site-
packages/django/core/management/__init__.py", line 385, in
execute_from_command_line
utility.execute()
File "/home/skelly/.virtualenvs/hq/local/lib/python2.7/site-
packages/django/core/management/__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/skelly/.virtualenvs/hq/local/lib/python2.7/site-
packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "/home/skelly/.virtualenvs/hq/local/lib/python2.7/site-
packages/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/home/skelly/.virtualenvs/hq/local/lib/python2.7/site-
packages/django/core/management/commands/squashmigrations.py", line 130,
in handle
fh.write(writer.as_string())
File "/home/skelly/.virtualenvs/hq/local/lib/python2.7/site-
packages/django/db/migrations/writer.py", line 131, in as_string
operation_string, operation_imports =
OperationWriter(operation).serialize()
File "/home/skelly/.virtualenvs/hq/local/lib/python2.7/site-
packages/django/db/migrations/writer.py", line 88, in serialize
arg_string, arg_imports = MigrationWriter.serialize(arg_value)
File "/home/skelly/.virtualenvs/hq/local/lib/python2.7/site-
packages/django/db/migrations/writer.py", line 263, in serialize
item_string, item_imports = cls.serialize(item)
File "/home/skelly/.virtualenvs/hq/local/lib/python2.7/site-
packages/django/db/migrations/writer.py", line 350, in serialize
return cls.serialize_deconstructed(*value.deconstruct())
File "/home/skelly/.virtualenvs/hq/local/lib/python2.7/site-
packages/django/db/migrations/writer.py", line 226, in
serialize_deconstructed
module, name = path.rsplit(".", 1)
ValueError: need more than 1 value to unpack
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/25817#comment:1>
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