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docs/en/docs/tutorial/request-form-models.md

@@ -97,7 +97,7 @@ and the JSON response is also correct:
 ```
 
 When the checkbox is *unchecked*, though, something strange happens.
-The submitted form data is *empty*, 
+The submitted form data is *empty*,
 and the returned JSON data still shows `checkbox` still being `true`!
 
 This is because checkboxes in HTML forms don't work exactly like the boolean inputs we expect,
@@ -108,7 +108,7 @@ When dealing with form models with defaults,
 we need to take special care to handle cases where the field being *unset* has a specific meaning.
 
 In some cases, we can resolve the problem by changing or removing the default,
-but we don't always have that option - 
+but we don't always have that option -
 particularly when the model is used in other places than the form
 (model reuse is one of the benefits of building FastAPI on top of pydantic, after all!).
 
@@ -116,8 +116,8 @@ To do this, you can use a [`model_validator`](https://docs.pydantic.dev/latest/c
 in the `before` mode - before the defaults from the model are applied,
 to differentiate between an explicit `False` value and an unset value.
 
-We also don't want to just treat any time the value is unset as ``False`` - 
+We also don't want to just treat any time the value is unset as ``False`` -
-that would defeat the purpose of the default! 
+that would defeat the purpose of the default!
 We want to specifically correct the behavior when it is used in the context of a *form.*
 
 So we can additionally use the `'fastapi_field'` passed to the

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() %}
@@ -16,7 +18,7 @@ form_template = """
   <label for="{{ field_name }}">{{ field_name }}</label>
   {% if field.annotation.__name__ == "bool" %}
   <input type="checkbox" name="{{field_name}}"
-    {% if field.default %} 
+    {% if field.default %}
     checked="checked"
     {% endif %}
   >
@@ -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
 
 
@@ -29,7 +30,7 @@ form_template = """
   <label for="{{ field_name }}">{{ field_name }}</label>
   {% if field.annotation.__name__ == "bool" %}
   <input type="checkbox" name="{{field_name}}"
-    {% if field.default %} 
+    {% if field.default %}
     checked="checked"
     {% endif %}
   >
@@ -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
 
 
@@ -31,7 +32,7 @@ form_template = """
   <label for="{{ field_name }}">{{ field_name }}</label>
   {% if field.annotation.__name__ == "bool" %}
   <input type="checkbox" name="{{field_name}}"
-    {% if field.default %} 
+    {% if field.default %}
     checked="checked"
     {% endif %}
   >
@@ -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
 
 
@@ -23,7 +24,7 @@ form_template = """
   <label for="{{ field_name }}">{{ field_name }}</label>
   {% if field.annotation.__name__ == "bool" %}
   <input type="checkbox" name="{{field_name}}"
-    {% if field.default %} 
+    {% if field.default %}
     checked="checked"
     {% endif %}
   >
@@ -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
 
 
@@ -25,7 +26,7 @@ form_template = """
   <label for="{{ field_name }}">{{ field_name }}</label>
   {% if field.annotation.__name__ == "bool" %}
   <input type="checkbox" name="{{field_name}}"
-    {% if field.default %} 
+    {% if field.default %}
     checked="checked"
     {% endif %}
   >
@@ -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: