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[4.1.x] Fixed #31788 -- Fixed migration optimization after altering field to ManyToManyField.

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This makes AddField() used for altering to ManyToManyField, dependent
on the prior RemoveField.
Backport of 798b6c23ee from main
This commit is contained in:
David Wobrock
2022-06-02 12:10:27 +02:00
committed by Mariusz Felisiak
parent 0fb0355271
commit 9fce76a237
2 changed files with 49 additions and 6 deletions
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5
django/db/migrations/autodetector.py
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@@ -1022,8 +1022,9 @@ class MigrationAutodetector:
def _generate_added_field(self, app_label, model_name, field_name):
field = self.to_state.models[app_label, model_name].get_field(field_name)
# Fields that are foreignkeys/m2ms depend on stuff
dependencies = []
# Adding a field always depends at least on its removal.
dependencies = [(app_label, model_name, field_name, False)]
# Fields that are foreignkeys/m2ms depend on stuff.
if field.remote_field and field.remote_field.model:
dependencies.extend(
self._get_dependencies_for_foreign_key(