mirror of https://github.com/tiangolo/fastapi.git
61 lines
1.8 KiB
Python
61 lines
1.8 KiB
Python
from fastapi import FastAPI, Form, Request
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from fastapi.responses import HTMLResponse
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from fastapi.templating import Jinja2Templates
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from jinja2 import DictLoader, Environment
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from pydantic import BaseModel, ValidationInfo, model_validator
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class MyModel(BaseModel):
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checkbox: bool = True
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@model_validator(mode="before")
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def handle_defaults(cls, value: dict, info: ValidationInfo) -> dict:
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# if this model is being used outside of fastapi, return normally
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if info.context is None or "fastapi_field" not in info.context:
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return value
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# check if we are being validated from form input,
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# and if so, treat the unset checkbox as False
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field_info = info.context["fastapi_field"].field_info
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is_form = type(field_info).__name__ == "Form"
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if is_form and "checkbox" not in value:
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value["checkbox"] = False
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return value
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form_template = """
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<form action="/form" method="POST">
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{% for field_name, field in model.model_fields.items() %}
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<p>
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<label for="{{ field_name }}">{{ field_name }}</label>
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{% if field.annotation.__name__ == "bool" %}
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<input type="checkbox" name="{{field_name}}"
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{% if field.default %}
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checked="checked"
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{% endif %}
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>
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{% else %}
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<input name="{{ field_name }}">
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{% endif %}
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</p>
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{% endfor %}
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<button type="submit">Submit</button>
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</form>
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"""
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loader = DictLoader({"form.html": form_template})
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templates = Jinja2Templates(env=Environment(loader=loader))
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app = FastAPI()
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@app.get("/form", response_class=HTMLResponse)
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async def show_form(request: Request):
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return templates.TemplateResponse(
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request=request, name="form.html", context={"model": MyModel}
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)
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@app.post("/form")
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async def submit_form(data: MyModel = Form()) -> MyModel:
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return data
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