👷 Add CI for both Pydantic v1 and v2 (#9688)

* 👷 Test and install Pydantic v1 and v2 in CI

* 💚 Tweak CI config for Pydantic v1 and v2

* 💚 Fix Pydantic v2 specification in CI

* 🐛 Fix type annotations for compatibility with Python 3.7

* 💚 Install Pydantic v2 for lints

* 🐛 Fix type annotations for Pydantic v2

* 💚 Re-use test cache for lint

.github/workflows/test.yml

@@ -25,10 +25,12 @@ jobs:
         id: cache
         with:
           path: ${{ env.pythonLocation }}
-          key: ${{ runner.os }}-python-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'requirements-tests.txt') }}-test-v03
+          key: ${{ runner.os }}-python-${{ env.pythonLocation }}-pydantic-v2-${{ hashFiles('pyproject.toml', 'requirements-tests.txt') }}-test-v03
       - name: Install Dependencies
         if: steps.cache.outputs.cache-hit != 'true'
         run: pip install -r requirements-tests.txt
+      - name: Install Pydantic v2
+        run: pip install --pre "pydantic>=2.0.0b2,<3.0.0"
       - name: Lint
         run: bash scripts/lint.sh
 
@@ -37,6 +39,7 @@ jobs:
     strategy:
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        pydantic-version: ["pydantic-v1", "pydantic-v2"]
       fail-fast: false
     steps:
       - uses: actions/checkout@v3
@@ -51,10 +54,16 @@ jobs:
         id: cache
         with:
           path: ${{ env.pythonLocation }}
-          key: ${{ runner.os }}-python-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'requirements-tests.txt') }}-test-v03
+          key: ${{ runner.os }}-python-${{ env.pythonLocation }}-${{ matrix.pydantic-version }}-${{ hashFiles('pyproject.toml', 'requirements-tests.txt') }}-test-v03
       - name: Install Dependencies
         if: steps.cache.outputs.cache-hit != 'true'
         run: pip install -r requirements-tests.txt
+      - name: Install Pydantic v1
+        if: matrix.pydantic-version == 'pydantic-v1'
+        run: pip install "pydantic>=1.10.0,<2.0.0"
+      - name: Install Pydantic v2
+        if: matrix.pydantic-version == 'pydantic-v2'
+        run: pip install --pre "pydantic>=2.0.0b2,<3.0.0"
       - run: mkdir coverage
       - name: Test
         run: bash scripts/test.sh

fastapi/_compat.py

@@ -114,7 +114,7 @@ if PYDANTIC_V2:
             values: Dict[str, Any] = {},  # noqa: B006
             *,
             loc: Union[Tuple[Union[int, str], ...], str] = "",
-        ) -> tuple[Any, Union[List[ValidationError], None]]:
+        ) -> Tuple[Any, Union[List[ValidationError], None]]:
             try:
                 return (
                     self._type_adapter.validate_python(value, from_attributes=True),
@@ -415,13 +415,13 @@ def get_definitions(
         return get_model_definitions(flat_models=models, model_name_map=model_name_map)
 
 
-def _annotation_is_sequence(annotation: type[Any] | None) -> bool:
+def _annotation_is_sequence(annotation: Union[Type[Any], None]) -> bool:
     if lenient_issubclass(annotation, (str, bytes)):
         return False
     return lenient_issubclass(annotation, sequence_types)
 
 
-def field_annotation_is_sequence(annotation: type[Any] | None) -> bool:
+def field_annotation_is_sequence(annotation: Union[Type[Any], None]) -> bool:
     return _annotation_is_sequence(annotation) or _annotation_is_sequence(
         get_origin(annotation)
     )
@@ -431,7 +431,7 @@ def value_is_sequence(value: Any) -> bool:
     return isinstance(value, sequence_types) and not isinstance(value, (str, bytes))  # type: ignore[arg-type]
 
 
-def _annotation_is_complex(annotation: Type[Any] | None) -> bool:
+def _annotation_is_complex(annotation: Union[Type[Any], None]) -> bool:
     return (
         lenient_issubclass(annotation, (BaseModel, Mapping, UploadFile))
         or _annotation_is_sequence(annotation)
@@ -439,7 +439,7 @@ def _annotation_is_complex(annotation: Type[Any] | None) -> bool:
     )
 
 
-def field_annotation_is_complex(annotation: type[Any] | None) -> bool:
+def field_annotation_is_complex(annotation: Union[Type[Any], None]) -> bool:
     origin = get_origin(annotation)
     if origin is Union or origin is UnionType:
         return any(field_annotation_is_complex(arg) for arg in get_args(annotation))
@@ -461,7 +461,7 @@ def field_annotation_is_scalar(annotation: Any) -> bool:
     return annotation is Ellipsis or not field_annotation_is_complex(annotation)
 
 
-def field_annotation_is_scalar_sequence(annotation: type[Any] | None) -> bool:
+def field_annotation_is_scalar_sequence(annotation: Union[Type[Any], None]) -> bool:
     origin = get_origin(annotation)
     if origin is Union or origin is UnionType:
         at_least_one_scalar_sequence = False
@@ -525,7 +525,7 @@ def is_uploadfile_or_nonable_uploadfile_annotation(annotation: Any) -> bool:
     return False
 
 
-def is_bytes_sequence_annotation(annotation: type[Any] | None) -> bool:
+def is_bytes_sequence_annotation(annotation: Union[Type[Any], None]) -> bool:
     origin = get_origin(annotation)
     if origin is Union or origin is UnionType:
         at_least_one_bytes_sequence = False
@@ -540,7 +540,7 @@ def is_bytes_sequence_annotation(annotation: type[Any] | None) -> bool:
     )
 
 
-def is_uploadfile_sequence_annotation(annotation: type[Any] | None) -> bool:
+def is_uploadfile_sequence_annotation(annotation: Union[Type[Any], None]) -> bool:
     origin = get_origin(annotation)
     if origin is Union or origin is UnionType:
         at_least_one_bytes_sequence = False

tests/test_response_model_data_filter.py

@@ -1,3 +1,5 @@
+from typing import List
+
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 from pydantic import BaseModel
@@ -42,7 +44,7 @@ async def read_pet(pet_id: int):
     return pet
 
 
-@app.get("/pets/", response_model=list[PetOut])
+@app.get("/pets/", response_model=List[PetOut])
 async def read_pets():
     user = UserDB(
         email="johndoe@example.com",

tests/test_response_model_data_filter_no_inheritance.py

@@ -1,3 +1,5 @@
+from typing import List
+
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 from pydantic import BaseModel
@@ -44,7 +46,7 @@ async def read_pet(pet_id: int):
     return pet
 
 
-@app.get("/pets/", response_model=list[PetOut])
+@app.get("/pets/", response_model=List[PetOut])
 async def read_pets():
     user = UserDB(
         email="johndoe@example.com",