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docs_src/request_form_models/tutorial003.py

@@ -1,12 +1,14 @@
-from pydantic import BaseModel
 from fastapi import FastAPI, Form, Request
 from fastapi.responses import HTMLResponse
 from fastapi.templating import Jinja2Templates
 from jinja2 import DictLoader, Environment
+from pydantic import BaseModel
+
 
 class MyModel(BaseModel):
     checkbox: bool = True
 
+
 form_template = """
 <form action="/form" method="POST">
 {% for field_name, field in model.model_fields.items() %}
@@ -31,12 +33,14 @@ templates = Jinja2Templates(env=Environment(loader=loader))
 
 app = FastAPI()
 
+
 @app.get("/form", response_class=HTMLResponse)
 async def show_form(request: Request):
     return templates.TemplateResponse(
         request=request, name="form.html", context={"model": MyModel}
     )
 
-@app.post('/form')
+
+@app.post("/form")
 async def submit_form(data: MyModel = Form()) -> MyModel:
     return data

docs_src/request_form_models/tutorial003_an_py39.py

@@ -1,14 +1,16 @@
 from typing import Annotated
 
-from pydantic import BaseModel
 from fastapi import FastAPI, Form, Request
 from fastapi.responses import HTMLResponse
 from fastapi.templating import Jinja2Templates
 from jinja2 import DictLoader, Environment
+from pydantic import BaseModel
+
 
 class MyModel(BaseModel):
     checkbox: bool = True
 
+
 form_template = """
 <form action="/form" method="POST">
 {% for field_name, field in model.model_fields.items() %}
@@ -33,12 +35,14 @@ templates = Jinja2Templates(env=Environment(loader=loader))
 
 app = FastAPI()
 
+
 @app.get("/form", response_class=HTMLResponse)
 async def show_form(request: Request):
     return templates.TemplateResponse(
         request=request, name="form.html", context={"model": MyModel}
     )
 
-@app.post('/form')
+
+@app.post("/form")
 async def submit_form(data: Annotated[MyModel, Form()]) -> MyModel:
     return data

docs_src/request_form_models/tutorial004.py

@@ -1,8 +1,9 @@
-from pydantic import BaseModel, ValidationInfo, model_validator
 from fastapi import FastAPI, Form, Request
 from fastapi.responses import HTMLResponse
 from fastapi.templating import Jinja2Templates
 from jinja2 import DictLoader, Environment
+from pydantic import BaseModel, ValidationInfo, model_validator
+
 
 class MyModel(BaseModel):
     checkbox: bool = True
@@ -10,15 +11,15 @@ class MyModel(BaseModel):
     @model_validator(mode="before")
     def handle_defaults(cls, value: dict, info: ValidationInfo) -> dict:
         # if this model is being used outside of fastapi, return normally
-        if info.context is None or 'fastapi_field' not in info.context:
+        if info.context is None or "fastapi_field" not in info.context:
             return value
 
         # check if we are being validated from form input,
         # and if so, treat the unset checkbox as False
-        field_info = info.context['fastapi_field'].field_info
+        field_info = info.context["fastapi_field"].field_info
         is_form = type(field_info).__name__ == "Form"
-        if is_form and 'checkbox' not in value:
+        if is_form and "checkbox" not in value:
-            value['checkbox'] = False
+            value["checkbox"] = False
         return value
 
 
@@ -46,12 +47,14 @@ templates = Jinja2Templates(env=Environment(loader=loader))
 
 app = FastAPI()
 
+
 @app.get("/form", response_class=HTMLResponse)
 async def show_form(request: Request):
     return templates.TemplateResponse(
         request=request, name="form.html", context={"model": MyModel}
     )
 
-@app.post('/form')
+
+@app.post("/form")
 async def submit_form(data: MyModel = Form()) -> MyModel:
     return data

docs_src/request_form_models/tutorial004_an_py39.py

@@ -1,10 +1,11 @@
 from typing import Annotated
 
-from pydantic import BaseModel, ValidationInfo, model_validator
 from fastapi import FastAPI, Form, Request
 from fastapi.responses import HTMLResponse
 from fastapi.templating import Jinja2Templates
 from jinja2 import DictLoader, Environment
+from pydantic import BaseModel, ValidationInfo, model_validator
+
 
 class MyModel(BaseModel):
     checkbox: bool = True
@@ -12,15 +13,15 @@ class MyModel(BaseModel):
     @model_validator(mode="before")
     def handle_defaults(cls, value: dict, info: ValidationInfo) -> dict:
         # if this model is being used outside of fastapi, return normally
-        if info.context is None or 'fastapi_field' not in info.context:
+        if info.context is None or "fastapi_field" not in info.context:
             return value
 
         # check if we are being validated from form input,
         # and if so, treat the unset checkbox as False
-        field_info = info.context['fastapi_field'].field_info
+        field_info = info.context["fastapi_field"].field_info
         is_form = type(field_info).__name__ == "Form"
-        if is_form and 'checkbox' not in value:
+        if is_form and "checkbox" not in value:
-            value['checkbox'] = False
+            value["checkbox"] = False
         return value
 
 
@@ -48,12 +49,14 @@ templates = Jinja2Templates(env=Environment(loader=loader))
 
 app = FastAPI()
 
+
 @app.get("/form", response_class=HTMLResponse)
 async def show_form(request: Request):
     return templates.TemplateResponse(
         request=request, name="form.html", context={"model": MyModel}
     )
 
-@app.post('/form')
+
+@app.post("/form")
 async def submit_form(data: Annotated[MyModel, Form()]) -> MyModel:
     return data

docs_src/request_form_models/tutorial004_pv1.py

@@ -1,8 +1,9 @@
-from pydantic import BaseModel, model_validator
 from fastapi import FastAPI, Form, Request
 from fastapi.responses import HTMLResponse
 from fastapi.templating import Jinja2Templates
 from jinja2 import DictLoader, Environment
+from pydantic import BaseModel, model_validator
+
 
 class MyModel(BaseModel):
     checkbox: bool = True
@@ -11,8 +12,8 @@ class MyModel(BaseModel):
     def handle_defaults(cls, value: dict) -> dict:
         # We can't tell if we're being validated by fastAPI,
         # so we have to just YOLO this.
-        if 'checkbox' not in value:
+        if "checkbox" not in value:
-            value['checkbox'] = False
+            value["checkbox"] = False
         return value
 
 
@@ -40,12 +41,14 @@ templates = Jinja2Templates(env=Environment(loader=loader))
 
 app = FastAPI()
 
+
 @app.get("/form", response_class=HTMLResponse)
 async def show_form(request: Request):
     return templates.TemplateResponse(
         request=request, name="form.html", context={"model": MyModel}
     )
 
-@app.post('/form')
+
+@app.post("/form")
 async def submit_form(data: MyModel = Form()) -> MyModel:
     return data

docs_src/request_form_models/tutorial004_pv1_an_py39.py

@@ -1,10 +1,11 @@
 from typing import Annotated
 
-from pydantic import BaseModel, model_validator
 from fastapi import FastAPI, Form, Request
 from fastapi.responses import HTMLResponse
 from fastapi.templating import Jinja2Templates
 from jinja2 import DictLoader, Environment
+from pydantic import BaseModel, model_validator
+
 
 class MyModel(BaseModel):
     checkbox: bool = True
@@ -13,8 +14,8 @@ class MyModel(BaseModel):
     def handle_defaults(cls, value: dict) -> dict:
         # We can't tell if we're being validated by fastAPI,
         # so we have to just YOLO this.
-        if 'checkbox' not in value:
+        if "checkbox" not in value:
-            value['checkbox'] = False
+            value["checkbox"] = False
         return value
 
 
@@ -42,12 +43,14 @@ templates = Jinja2Templates(env=Environment(loader=loader))
 
 app = FastAPI()
 
+
 @app.get("/form", response_class=HTMLResponse)
 async def show_form(request: Request):
     return templates.TemplateResponse(
         request=request, name="form.html", context={"model": MyModel}
     )
 
-@app.post('/form')
+
+@app.post("/form")
 async def submit_form(data: Annotated[MyModel, Form()]) -> MyModel:
     return data

fastapi/_compat.py

@@ -126,7 +126,9 @@ if PYDANTIC_V2:
         ) -> Tuple[Any, Union[List[Dict[str, Any]], None]]:
             try:
                 return (
-                    self._type_adapter.validate_python(value, from_attributes=True, context={"fastapi_field": self}),
+                    self._type_adapter.validate_python(
+                        value, from_attributes=True, context={"fastapi_field": self}
+                    ),
                     None,
                 )
             except ValidationError as exc: