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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/topics/migrations.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/topics/migrations.txt b/docs/topics/migrations.txt index c78e395305..5afdaf2d72 100644 --- a/docs/topics/migrations.txt +++ b/docs/topics/migrations.txt @@ -389,6 +389,11 @@ need to do is use the historical model and iterate over the rows:: Once that's done, we can just run ``python manage.py migrate`` as normal and the data migration will run in place alongside other migrations. +You can pass a second callable to +:class:`~django.db.migrations.operations.RunPython` to run whatever logic you +want executed when migrating backwards. If this callable is omitted, migrating +backwards will raise an exception. + If you're interested in the more advanced migration operations, or want to be able to write your own, see the :doc:`migration operations reference </ref/migration-operations>`. |