Dev

CHANGELOG.rst

@@ -1,6 +1,12 @@
 Changelog
 =========
 
+2.11.0 (2024-05-11)
+------------------
+
+- named tuple support added. See https://github.com/dapper91/pydantic-xml/issues/172
+
+
 2.10.0 (2024-05-09)
 ------------------
 

README.rst

@@ -43,6 +43,7 @@ What is not supported?
 ______________________
 
 - `dataclasses <https://docs.pydantic.dev/usage/dataclasses/>`_
+- `callable discriminators <https://docs.pydantic.dev/latest/concepts/unions/#discriminated-unions-with-callable-discriminator>`_
 
 Getting started
 ---------------

pydantic_xml/serializers/factories/__init__.py

@@ -1,2 +1,2 @@
-from . import heterogeneous, homogeneous, is_instance, mapping, model, primitive, raw, tagged_union, tuple
-from . import typed_mapping, union, wrapper
+from . import call, heterogeneous, homogeneous, is_instance, mapping, model, named_tuple, primitive, raw, tagged_union
+from . import tuple, typed_mapping, union, wrapper

pydantic_xml/serializers/factories/call.py

@@ -0,0 +1,16 @@
+import inspect
+
+from pydantic_core import core_schema as pcs
+
+from pydantic_xml import errors
+from pydantic_xml.serializers.factories import named_tuple
+from pydantic_xml.serializers.serializer import Serializer
+
+
+def from_core_schema(schema: pcs.CallSchema, ctx: Serializer.Context) -> Serializer:
+    func = schema['function']
+
+    if inspect.isclass(func) and issubclass(func, tuple):
+        return named_tuple.from_core_schema(schema, ctx)
+    else:
+        raise errors.ModelError("type call is not supported")

pydantic_xml/serializers/factories/heterogeneous.py

@@ -85,6 +85,7 @@ def from_core_schema(schema: pcs.TupleSchema, ctx: Serializer.Context) -> Serial
                 SchemaTypeFamily.TYPED_MAPPING,
                 SchemaTypeFamily.UNION,
                 SchemaTypeFamily.IS_INSTANCE,
+                SchemaTypeFamily.CALL,
         ):
             raise errors.ModelFieldError(
                 ctx.model_name, ctx.field_name, "collection item must be of primitive, model, mapping or union type",

pydantic_xml/serializers/factories/homogeneous.py

@@ -103,6 +103,7 @@ def from_core_schema(schema: HomogeneousCollectionTypeSchema, ctx: Serializer.Co
         SchemaTypeFamily.TYPED_MAPPING,
         SchemaTypeFamily.UNION,
         SchemaTypeFamily.IS_INSTANCE,
+        SchemaTypeFamily.CALL,
         SchemaTypeFamily.TUPLE,
     ):
         raise errors.ModelFieldError(
@@ -113,6 +114,7 @@ def from_core_schema(schema: HomogeneousCollectionTypeSchema, ctx: Serializer.Co
             SchemaTypeFamily.MODEL,
             SchemaTypeFamily.UNION,
             SchemaTypeFamily.TUPLE,
+            SchemaTypeFamily.CALL,
     ) and ctx.entity_location is None:
         raise errors.ModelFieldError(ctx.model_name, ctx.field_name, "entity name is not provided")
 

pydantic_xml/serializers/factories/named_tuple.py

@@ -0,0 +1,74 @@
+import typing
+from typing import Any, Dict, List, Optional, Tuple
+
+from pydantic_core import core_schema as pcs
+
+from pydantic_xml import errors
+from pydantic_xml.element import XmlElementReader, XmlElementWriter
+from pydantic_xml.serializers.factories import heterogeneous
+from pydantic_xml.serializers.serializer import TYPE_FAMILY, SchemaTypeFamily, Serializer
+from pydantic_xml.typedefs import EntityLocation, Location
+
+
+class ElementSerializer(Serializer):
+    @classmethod
+    def from_core_schema(cls, schema: pcs.ArgumentsSchema, ctx: Serializer.Context) -> 'ElementSerializer':
+        model_name = ctx.model_name
+        computed = ctx.field_computed
+        inner_serializers: List[Serializer] = []
+        for argument_schema in schema['arguments_schema']:
+            param_schema = argument_schema['schema']
+            inner_serializers.append(Serializer.parse_core_schema(param_schema, ctx))
+
+        return cls(model_name, computed, tuple(inner_serializers))
+
+    def __init__(self, model_name: str, computed: bool, inner_serializers: Tuple[Serializer, ...]):
+        self._inner_serializer = heterogeneous.ElementSerializer(model_name, computed, inner_serializers)
+
+    def serialize(
+            self, element: XmlElementWriter, value: List[Any], encoded: List[Any], *, skip_empty: bool = False,
+    ) -> Optional[XmlElementWriter]:
+        return self._inner_serializer.serialize(element, value, encoded, skip_empty=skip_empty)
+
+    def deserialize(
+            self,
+            element: Optional[XmlElementReader],
+            *,
+            context: Optional[Dict[str, Any]],
+            sourcemap: Dict[Location, int],
+            loc: Location,
+    ) -> Optional[List[Any]]:
+        return self._inner_serializer.deserialize(element, context=context, sourcemap=sourcemap, loc=loc)
+
+
+def from_core_schema(schema: pcs.CallSchema, ctx: Serializer.Context) -> Serializer:
+    arguments_schema = typing.cast(pcs.ArgumentsSchema, schema['arguments_schema'])
+    for argument_schema in arguments_schema['arguments_schema']:
+        param_schema = argument_schema['schema']
+        param_schema, ctx = Serializer.preprocess_schema(param_schema, ctx)
+
+        param_type_family = TYPE_FAMILY.get(param_schema['type'])
+        if param_type_family not in (
+                SchemaTypeFamily.PRIMITIVE,
+                SchemaTypeFamily.MODEL,
+                SchemaTypeFamily.MAPPING,
+                SchemaTypeFamily.TYPED_MAPPING,
+                SchemaTypeFamily.UNION,
+                SchemaTypeFamily.IS_INSTANCE,
+                SchemaTypeFamily.CALL,
+        ):
+            raise errors.ModelFieldError(
+                ctx.model_name, ctx.field_name, "tuple item must be of primitive, model, mapping or union type",
+            )
+
+        if param_type_family not in (SchemaTypeFamily.MODEL, SchemaTypeFamily.UNION) and ctx.entity_location is None:
+            raise errors.ModelFieldError(ctx.model_name, ctx.field_name, "entity name is not provided")
+
+    if ctx.entity_location is EntityLocation.ELEMENT:
+        return ElementSerializer.from_core_schema(arguments_schema, ctx)
+    elif ctx.entity_location is None:
+        return ElementSerializer.from_core_schema(arguments_schema, ctx)
+    elif ctx.entity_location is EntityLocation.ATTRIBUTE:
+        raise errors.ModelFieldError(ctx.model_name, ctx.field_name, "attributes of tuple types are not supported")
+    else:
+        raise AssertionError("unreachable")

pydantic_xml/serializers/serializer.py

@@ -39,6 +39,7 @@ class SchemaTypeFamily(IntEnum):
     DEFINITION_REF = 10
     JSON_OR_PYTHON = 11
     IS_INSTANCE = 12
+    CALL = 13
 
 
 TYPE_FAMILY = {
@@ -87,6 +88,8 @@ class SchemaTypeFamily(IntEnum):
     'definition-ref':   SchemaTypeFamily.DEFINITION_REF,
 
     'json-or-python':   SchemaTypeFamily.JSON_OR_PYTHON,
+
+    'call':             SchemaTypeFamily.CALL,
 }
 
 
@@ -265,6 +268,10 @@ def select_serializer(cls, schema: pcs.CoreSchema, ctx: Context) -> 'Serializer'
             schema = typing.cast(pcs.IsInstanceSchema, schema)
             return factories.is_instance.from_core_schema(schema, ctx)
 
+        elif type_family is SchemaTypeFamily.CALL:
+            schema = typing.cast(pcs.CallSchema, schema)
+            return factories.call.from_core_schema(schema, ctx)
+
         else:
             raise AssertionError("unreachable")
 

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pydantic-xml"
-version = "2.10.0"
+version = "2.11.0"
 description = "pydantic xml extension"
 authors = ["Dmitry Pershin <[email protected]>"]
 license = "Unlicense"

tests/test_named_tuple.py

@@ -0,0 +1,168 @@
+from typing import List, NamedTuple, Optional, Union
+
+from helpers import assert_xml_equal
+
+from pydantic_xml import BaseXmlModel, RootXmlModel, attr, element
+
+
+def test_named_tuple_of_primitives_extraction():
+    class TestTuple(NamedTuple):
+        field1: int
+        field2: float
+        field3: str
+        field4: Optional[str]
+
+    class TestModel(BaseXmlModel, tag='model1'):
+        elements: TestTuple = element(tag='element')
+
+    xml = '''
+    <model1>
+        <element>1</element>
+        <element>2.2</element>
+        <element>string3</element>
+    </model1>
+    '''
+
+    actual_obj = TestModel.from_xml(xml)
+    expected_obj = TestModel(elements=(1, 2.2, "string3", None))
+
+    assert actual_obj == expected_obj
+
+    actual_xml = actual_obj.to_xml(skip_empty=True)
+    assert_xml_equal(actual_xml, xml)
+
+
+def test_named_tuple_of_mixed_types_extraction():
+    class TestSubModel1(BaseXmlModel):
+        attr1: int = attr()
+        element1: float = element()
+
+    class TestTuple(NamedTuple):
+        field1: TestSubModel1
+        field2: int
+
+    class TestModel(BaseXmlModel, tag='model1'):
+        submodels: TestTuple = element(tag='submodel')
+
+    xml = '''
+    <model1>
+        <submodel attr1="1">
+            <element1>2.2</element1>
+        </submodel>
+        <submodel>1</submodel>
+    </model1>
+    '''
+
+    actual_obj = TestModel.from_xml(xml)
+    expected_obj = TestModel(
+        submodels=[
+            TestSubModel1(attr1=1, element1=2.2),
+            1,
+        ],
+    )
+
+    assert actual_obj == expected_obj
+
+    actual_xml = actual_obj.to_xml()
+    assert_xml_equal(actual_xml, xml)
+
+
+def test_list_of_named_tuples_extraction():
+    class TestTuple(NamedTuple):
+        field1: int
+        field2: Optional[float] = None
+
+    class RootModel(BaseXmlModel, tag='model'):
+        elements: List[TestTuple] = element(tag='element')
+
+    xml = '''
+    <model>
+        <element>1</element>
+        <element>1.1</element>
+        <element>2</element>
+        <element></element>
+        <element>3</element>
+        <element>3.3</element>
+    </model>
+    '''
+
+    actual_obj = RootModel.from_xml(xml)
+    expected_obj = RootModel(
+        elements=[
+            (1, 1.1),
+            (2, None),
+            (3, 3.3),
+        ],
+    )
+
+    assert actual_obj == expected_obj
+
+    actual_xml = actual_obj.to_xml()
+    assert_xml_equal(actual_xml, xml)
+
+
+def test_list_of_named_tuples_of_models_extraction():
+    class SubModel1(RootXmlModel[str], tag='text'):
+        pass
+
+    class SubModel2(RootXmlModel[int], tag='number'):
+        pass
+
+    class TestTuple(NamedTuple):
+        field1: SubModel1
+        field2: Optional[SubModel2] = None
+
+    class RootModel(BaseXmlModel, tag='model'):
+        elements: List[TestTuple]
+
+    xml = '''
+    <model>
+        <text>text1</text>
+        <number>1</number>
+        <text>text2</text>
+        <text>text3</text>
+        <number>3</number>
+    </model>
+    '''
+
+    actual_obj = RootModel.from_xml(xml)
+    expected_obj = RootModel(
+        elements=[
+            (SubModel1('text1'), SubModel2(1)),
+            (SubModel1('text2'), None),
+            (SubModel1('text3'), SubModel2(3)),
+        ],
+    )
+
+    assert actual_obj == expected_obj
+
+    actual_xml = actual_obj.to_xml()
+    assert_xml_equal(actual_xml, xml)
+
+
+def test_primitive_union_named_tuple():
+    class TestTuple(NamedTuple):
+        field1: Union[int, float]
+        field2: str
+        field3: Union[int, float]
+
+    class TestModel(BaseXmlModel, tag='model'):
+        sublements: TestTuple = element(tag='model1')
+
+    xml = '''
+    <model>
+        <model1>1.1</model1>
+        <model1>text</model1>
+        <model1>1</model1>
+    </model>
+    '''
+
+    actual_obj = TestModel.from_xml(xml)
+    expected_obj = TestModel(
+        sublements=(float('1.1'), 'text', 1),
+    )
+
+    assert actual_obj == expected_obj
+
+    actual_xml = actual_obj.to_xml()
+    assert_xml_equal(actual_xml, xml)