Dev

CHANGELOG.rst

@@ -1,6 +1,12 @@
 Changelog
 =========
 
+2.8.1 (2024-01-21)
+------------------
+
+- union collection deserialization bug fixed. See https://github.com/dapper91/pydantic-xml/pull/165.
+
+
 2.8.0 (2024-01-13)
 ------------------
 

pydantic_xml/element/element.py

@@ -116,6 +116,12 @@ def apply_snapshot(self, snapshot: 'XmlElement[Any]') -> None:
         Applies a snapshot to the current element.
         """
 
+    @abc.abstractmethod
+    def step_forward(self) -> None:
+        """
+        Increment the current element index.
+        """
+
     @abc.abstractmethod
     def to_native(self) -> Any:
         """
@@ -305,6 +311,7 @@ def create_snapshot(self) -> 'XmlElement[NativeElement]':
             attributes=dict(self._state.attrib) if self._state.attrib is not None else None,
             elements=[element.create_snapshot() for element in self._state.elements],
             nsmap=dict(self._nsmap) if self._nsmap is not None else None,
+            sourceline=self._sourceline,
         )
         element._state.next_element_idx = self._state.next_element_idx
 
@@ -319,6 +326,9 @@ def apply_snapshot(self, snapshot: 'XmlElement[NativeElement]') -> None:
         self._state.elements = snapshot._state.elements
         self._state.next_element_idx = snapshot._state.next_element_idx
 
+    def step_forward(self) -> None:
+        self._state.next_element_idx += 1
+
     def is_empty(self) -> bool:
         if not self._state.text and not self._state.tail and not self._state.attrib and len(self._state.elements) == 0:
             return True

pydantic_xml/serializers/factories/union.py

@@ -117,6 +117,7 @@ def deserialize(
                 last_error = e
 
         if last_error is not None:
+            element.step_forward()
             raise last_error
 
         return result

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pydantic-xml"
-version = "2.8.0"
+version = "2.8.1"
 description = "pydantic xml extension"
 authors = ["Dmitry Pershin <dapper1291@gmail.com>"]
 license = "Unlicense"

tests/test_errors.py

@@ -170,3 +170,50 @@ class TestModel(BaseXmlModel, tag='model'):
             },
         },
     ]
+
+
+def test_models_union_errors():
+    class TestSubModel1(BaseXmlModel, tag='submodel1'):
+        data: int
+
+    class TestSubModel2(BaseXmlModel, tag='submodel2'):
+        data: float
+
+    class TestModel(BaseXmlModel, tag='model'):
+        submodel: List[Union[TestSubModel1, TestSubModel2]]
+
+    xml = '''
+        <model>
+            <submodel2>a</submodel2>
+            <submodel1>b</submodel1>
+        </model>
+    '''
+
+    with pytest.raises(pd.ValidationError) as exc:
+        TestModel.from_xml(xml)
+
+    err = exc.value
+    assert err.title == 'TestModel'
+    assert err.error_count() == 2
+    assert err.errors() == [
+        {
+            'input': 'a',
+            'loc': ('submodel', 0, 'data'),
+            'msg': f'[line {fmt_sourceline(3)}]: Input should be a valid number, unable to parse string as a number',
+            'type': 'float_parsing',
+            'ctx': {
+                'orig': 'Input should be a valid number, unable to parse string as a number',
+                'sourceline': fmt_sourceline(3),
+            },
+        },
+        {
+            'input': 'b',
+            'loc': ('submodel', 1, 'data'),
+            'msg': f'[line {fmt_sourceline(4)}]: Input should be a valid integer, unable to parse string as an integer',
+            'type': 'int_parsing',
+            'ctx': {
+                'orig': 'Input should be a valid integer, unable to parse string as an integer',
+                'sourceline': fmt_sourceline(4),
+            },
+        },
+    ]