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Fixed #21783: (again) Found second source of bug, also squashed it.
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@ -27,7 +27,15 @@ class AddField(Operation):
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from_model = from_state.render().get_model(app_label, self.model_name)
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to_model = to_state.render().get_model(app_label, self.model_name)
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if router.allow_migrate(schema_editor.connection.alias, to_model):
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schema_editor.add_field(from_model, to_model._meta.get_field_by_name(self.name)[0])
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field = to_model._meta.get_field_by_name(self.name)[0]
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if not self.preserve_default:
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field.default = self.field.default
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schema_editor.add_field(
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from_model,
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field,
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)
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if not self.preserve_default:
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field.default = NOT_PROVIDED
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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from_model = from_state.render().get_model(app_label, self.model_name)
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@ -184,6 +184,14 @@ class OperationTests(MigrationTestBase):
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if n == "height"
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][0]
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self.assertEqual(field.default, NOT_PROVIDED)
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# Test the database alteration
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project_state.render().get_model("test_adflpd", "pony").objects.create(
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weight = 4,
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)
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self.assertColumnNotExists("test_adflpd_pony", "height")
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with connection.schema_editor() as editor:
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operation.database_forwards("test_adflpd", editor, project_state, new_state)
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self.assertColumnExists("test_adflpd_pony", "height")
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def test_add_field_m2m(self):
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"""
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