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Made nested deconstruction support both forms of deconstruct()
Nested deconstruction should (silently) handle Field.deconstruct() as well as other arbitrary deconstructable objects. This allows having a field in the deconstruction of another field.
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@ -67,20 +67,21 @@ class MigrationAutodetector(object):
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if not model._meta.proxy and model._meta.managed and al not in self.to_state.real_apps:
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new_model_keys.append((al, mn))
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def _deep_deconstruct(obj, field=True):
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def _deep_deconstruct(obj):
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"""
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Recursive deconstruction for a field and its arguments.
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"""
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if not hasattr(obj, 'deconstruct'):
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return obj
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deconstructed = obj.deconstruct()
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if field:
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if isinstance(obj, models.Field):
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# we have a field which also returns a name
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deconstructed = deconstructed[1:]
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name, args, kwargs = deconstructed
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return (
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name,
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[_deep_deconstruct(value, field=False) for value in args],
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dict([(key, _deep_deconstruct(value, field=False))
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[_deep_deconstruct(value) for value in args],
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dict([(key, _deep_deconstruct(value))
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for key, value in kwargs.items()])
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)
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@ -28,6 +28,8 @@ class AutodetectorTests(TestCase):
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author_name_default = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200, default='Ada Lovelace'))])
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author_name_deconstructable_1 = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200, default=DeconstructableObject()))])
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author_name_deconstructable_2 = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200, default=DeconstructableObject()))])
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author_name_deconstructable_3 = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200, default=models.IntegerField()))])
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author_name_deconstructable_4 = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200, default=models.IntegerField()))])
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author_with_book = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200)), ("book", models.ForeignKey("otherapp.Book"))])
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author_renamed_with_book = ModelState("testapp", "Writer", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200)), ("book", models.ForeignKey("otherapp.Book"))])
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author_with_publisher_string = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200)), ("publisher_name", models.CharField(max_length=200))])
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@ -576,6 +578,16 @@ class AutodetectorTests(TestCase):
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changes = autodetector._detect_changes()
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self.assertEqual(changes, {})
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def test_deconstruct_field_kwarg(self):
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"""
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Field instances are handled correctly by nested deconstruction.
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"""
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before = self.make_project_state([self.author_name_deconstructable_3])
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after = self.make_project_state([self.author_name_deconstructable_4])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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self.assertEqual(changes, {})
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def test_replace_string_with_foreignkey(self):
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"""
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Adding an FK in the same "spot" as a deleted CharField should work. (#22300).
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