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Fixed #22476: Couldn't alter attributes on M2Ms with through= set

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This commit is contained in:
Andrew Godwin 2014-05-08 10:33:59 -07:00
parent 5ea34f3f86
commit b25aee3b7b
4 changed files with 49 additions and 3 deletions
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5
django/db/backends/sqlite3/schema.py
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@ -148,8 +148,11 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
new_type = new_db_params['type']
if old_type is None and new_type is None and (old_field.rel.through and new_field.rel.through and old_field.rel.through._meta.auto_created and new_field.rel.through._meta.auto_created):
return self._alter_many_to_many(model, old_field, new_field, strict)
elif old_type is None and new_type is None and (old_field.rel.through and new_field.rel.through and not old_field.rel.through._meta.auto_created and not new_field.rel.through._meta.auto_created):
# Both sides have through models; this is a no-op.
return
elif old_type is None or new_type is None:
raise ValueError("Cannot alter field %s into %s - they are not compatible types (probably means only one is an M2M with implicit through model)" % (
raise ValueError("Cannot alter field %s into %s - they are not compatible types (you cannot alter to or from M2M fields, or add or remove through= on M2M fields)" % (
old_field,
new_field,
))