Permalink
Browse files

[1.11.x] Made a few cosmetic updates to "Migrations that add unique f…

…ields".

Backport of 24d5378 from master
  • Loading branch information...
pauloxnet authored and timgraham committed Mar 27, 2017
1 parent 28cf32b commit e8f585440dce2730b08eda818eba166f9f9f4930
Showing with 5 additions and 5 deletions.
  1. +5 −5 docs/howto/writing-migrations.txt
@@ -94,8 +94,8 @@ the respective field according to your needs.
give them meaningful names in the examples below.
* Copy the ``AddField`` operation from the auto-generated migration (the first
- of the three new files) to the last migration and change ``AddField`` to
- ``AlterField``. For example:
+ of the three new files) to the last migration, change ``AddField`` to
+ ``AlterField``, and add imports of ``uuid`` and ``models``. For example:
.. snippet::
:filename: 0006_remove_uuid_null.py
@@ -107,7 +107,6 @@ the respective field according to your needs.
from django.db import migrations, models
import uuid
-
class Migration(migrations.Migration):
dependencies = [
@@ -149,7 +148,8 @@ the respective field according to your needs.
* In the first empty migration file, add a
:class:`~django.db.migrations.operations.RunPython` or
:class:`~django.db.migrations.operations.RunSQL` operation to generate a
- unique value (UUID in the example) for each existing row. For example:
+ unique value (UUID in the example) for each existing row. Also add an import
+ of ``uuid``. For example:
.. snippet::
:filename: 0005_populate_uuid_values.py
@@ -165,7 +165,7 @@ the respective field according to your needs.
MyModel = apps.get_model('myapp', 'MyModel')
for row in MyModel.objects.all():
row.uuid = uuid.uuid4()
- row.save()
+ row.save(update_fields=['uuid'])
class Migration(migrations.Migration):

0 comments on commit e8f5854

Please sign in to comment.