bugfix

- preventing fastapg issue [#4191](tiangolo/fastapi#4191)
- readme update

.github/workflows/python-package.yml

@@ -0,0 +1,40 @@
+# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
+
+name: Python package
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install flake8 pytest
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: Lint with flake8
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --ignore=E221,E124,E125,E501,E129 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --ignore=E221,E124,E125,E501,E129 --max-line-length=127 --statistics
+    - name: Test with pytest
+      run: |
+        pytest

.github/workflows/python-publish.yml

@@ -0,0 +1,39 @@
+# This workflow will upload a Python Package using Twine when a release is created
+# For more information see: https://help.github.com/en/actions/language-and-framework-guides/using-python-with-github-actions#publishing-to-package-registries
+
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Upload Python Package
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+
+jobs:
+  deploy:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v3
+      with:
+        python-version: '3.x'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install build
+    - name: Build package
+      run: python -m build
+    - name: Publish package
+      uses: pypa/gh-action-pypi-publish@27b31702a0e7fc50959f5ad993c78deac1bdfc29
+      with:
+        user: __token__
+        password: ${{ secrets.PYPI_API_TOKEN }}

README.md

@@ -38,21 +38,10 @@ if __name__ == "__main__":
 ![Hello World Example](.github/rsc/example.gif) 
 
 # Limitations
-This package depends on fastapi and xsdata. However, fastapi depends on
-pydantic, which ships a [bug](https://github.com/pydantic/pydantic/issues/4353) that causes several side effects.
-Among other, this bug is fixed within the major branch. Nevertheless, the bug still occurs in the current version
-(1.9.2). Anyhow, this package supports both versions.
+  - This package depends on fastapi and xsdata. However, fastapi depends on
+    pydantic, which ships a [bug](https://github.com/pydantic/pydantic/issues/4353) that causes several side effects.
+    Among other, this bug is fixed within the major branch. Nevertheless, the bug still occurs in the current version
+    (1.9.2). Anyhow, this package supports both versions.
 
   - :warning: Do not use keyword `required` for a field's metatdata. This will crash the openapi schema generator. Remove 
-    typehint `Optional` instead.
-
-  - :warning: You cannot use the same type for the response_model and the body. This will crash the openapi schema
-    generator. For example, this will not work:
-
-      ```python
-      @app.post("/echo", response_model=Echo)
-      def echo(x: Echo = XmlBody()) -> Echo:
-      ```
-
-    Recently, this bug was fixed within pydantic's main branch. However, it still exists in 1.9.2.
-
+    typehint `Optional` instead.

fastapi_xml/__init__.py

@@ -16,4 +16,19 @@
     "XmlBody"
 ]
 
-__version__ = "1.0.0a1"
+__version__ = "1.0.0a2"
+
+
+
+nonjson.OPENAPI_SCHEMA_MODIFIER.append(xmlbody.add_openapi_xml_schema)
+
+try:
+    # https://github.com/pydantic/pydantic/issues/4353
+    from .pydantic_dataclass_patch import pydantic_process_class_patched
+except ImportError:
+    # the patch does not work with the pydantic.dataclasses update (commit 576e4a3a8d9c98cbf5a1fe5149450febef887cc9)
+    # no worries, that update works as it should and is compatible with fastapi-xml
+    pass
+else:
+    import pydantic.dataclasses
+    pydantic.dataclasses._process_class = pydantic_process_class_patched

fastapi_xml/pydantic_dataclass_patch.py

@@ -6,11 +6,12 @@
 from pydantic.main import create_model
 from pydantic.typing import resolve_annotations
 from pydantic.utils import ClassAttribute
-from pydantic.dataclasses import _generate_pydantic_post_init, is_builtin_dataclass, _validate_dataclass, _get_validators
+from pydantic.dataclasses import _generate_pydantic_post_init, is_builtin_dataclass, _validate_dataclass, _get_validators, setattr_validate_assignment
 
 if TYPE_CHECKING:
     from pydantic.dataclasses import Dataclass
 
+_CACHE: Dict[Type, Type['Dataclass']] = {}
 
 def pydantic_process_class_patched(
     _cls: Type[Any],
@@ -22,6 +23,10 @@ def pydantic_process_class_patched(
     frozen: bool,
     config: Optional[Type[Any]],
 ) -> Type['Dataclass']:
+    or_cls = _cls
+    if or_cls in _CACHE:
+        return _CACHE[or_cls]
+
     import dataclasses
 
     post_init_original = getattr(_cls, '__post_init__', None)
@@ -111,5 +116,5 @@ def pydantic_process_class_patched(
         cls.__setattr__ = setattr_validate_assignment  # type: ignore[assignment]
 
     cls.__pydantic_model__.__try_update_forward_refs__(**{cls.__name__: cls})
-
+    _CACHE[or_cls] = cls
     return cls

fastapi_xml/xmlbody.py

@@ -233,18 +233,4 @@ def add_openapi_xml_schema(
             prefix    = field.metadata.get("target_namespace"),
             attribute = is_attribute,
             wrapped   = None
-        )
-
-
-OPENAPI_SCHEMA_MODIFIER.append(add_openapi_xml_schema)
-
-try:
-    # https://github.com/pydantic/pydantic/issues/4353
-    from .pydantic_dataclass_patch import pydantic_process_class_patched
-except ImportError:
-    # the patch does not work with the pydantic.dataclasses update (commit 576e4a3a8d9c98cbf5a1fe5149450febef887cc9)
-    # no worries, that update works as it should and is compatible with fastapi-xml
-    pass
-else:
-    import pydantic.dataclasses
-    pydantic.dataclasses._process_class = pydantic_process_class_patched
+        )