Expose AnySerializer via core schema (#1394)

python/pydantic_core/core_schema.py

@@ -219,6 +219,7 @@ def field_name(self) -> str | None:
     'multi-host-url',
     'json',
     'uuid',
+    'any',
 ]
 
 

tests/serializers/test_any.py

@@ -652,3 +652,32 @@ def test_ser_json_inf_nan_with_list_of_any() -> None:
     assert isnan(s.to_python([nan])[0])
     assert s.to_python([nan], mode='json')[0] is None
     assert s.to_json([nan]) == b'[null]'
+
+
+def test_simple_any_ser_schema_repr():
+    assert (
+        plain_repr(SchemaSerializer(core_schema.simple_ser_schema('any')))
+        == 'SchemaSerializer(serializer=Any(AnySerializer),definitions=[])'
+    )
+
+
+def test_simple_any_ser_schema():
+    import operator
+
+    class MyEnum(Enum):
+        A = (1,)
+        B = (2,)
+
+    v = SchemaSerializer(
+        core_schema.no_info_after_validator_function(
+            operator.attrgetter('value'),
+            core_schema.enum_schema(MyEnum, list(MyEnum.__members__.values())),
+            serialization=core_schema.simple_ser_schema('any'),
+        ),
+    )
+
+    assert v.to_python({MyEnum.A: 'x'}) == {MyEnum.A: 'x'}
+    assert v.to_python({MyEnum.A: 'x'}, mode='json') == {'1': 'x'}
+    assert v.to_json({MyEnum.A: 'x'}) == b'{"1":"x"}'
+    assert v.to_python(1) == 1
+    assert v.to_json(1) == b'1'