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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/topics/migrations.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/docs/topics/migrations.txt b/docs/topics/migrations.txt index 4eb9b4377d..048daaab37 100644 --- a/docs/topics/migrations.txt +++ b/docs/topics/migrations.txt @@ -244,6 +244,15 @@ it's entirely possible to write them manually if you need to. Some of the more complex operations are not autodetectable and are only available via a hand-written migration, so don't be scared about editing them if you have to. +Custom fields +~~~~~~~~~~~~~ + +You can't modify the number of positional arguments in an already migrated +custom field without raising a TypeError. The old migration will call the +modified ``__init__`` method with the old signature. So if you need a new +argument, please create a keyword argument and use e.g. +``assert kwargs.get('argument_name') is not None`` in the constructor. + Adding migrations to apps ------------------------- |