🪛 A simple pydantic to Form FastAPI model converter.

Related tags

Command-line Toolspyfa-converter
Overview

pyfa-converter

Makes it pretty easy to create a model based on Field [pydantic] and use the model for www-form-data.

How to install?

pip install pyfa_converter

How to simplify your life?

image

What do I need to do with the model?

  • We put the decorator @PydanticConverter.body for the model and enjoy.
  • data: YourPydanticModel = FormBody(YourPydanticModel)

If you want to accept a file on an endpoint, then the content-type for that endpoint changes from application/json to www-form-data.

FastAPI does not know how to override the pydantic schema so that parameters are passed as form. Even if you do

foo: CustomPydanticModel = Depends() all model attributes will be passed as query, but we want them to become body, that's what this library exists for.

Usually you use something along the lines of:

image

But, if we accept a lot of fields, then the function becomes very large (the number of attributes for the endpoint increases and it does not look very good).

Thanks to this library, it is possible to force the conversion of Field fields into fields of FastAPI Form with full preservation of all attributes (alias, gt, te, description, title, example and more...)

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Comments
  • Error: TypeError: unsupported operand type(s) for |: 'ModelMetaclass' and 'type'

    Error: TypeError: unsupported operand type(s) for |: 'ModelMetaclass' and 'type'

    Using the

    from pyfa_converter import FormDepends

    and get the error

    TypeError: unsupported operand type(s) for |: 'ModelMetaclass' and 'type'

    python: 3.9

    opened by Terryhung 4
  • Add License

    Add License

    Hi! The code in this repo seems super useful for us working with pydantic + fastapi, but we can't use it without a LICENSE. Could you add LICENSE file to the repo? MIT is a permissive one if you don't have an opinion otherwise

    opened by dzcode 3
  • Big update 1.0.0.0!

    Big update 1.0.0.0!

    • The decorator above the model is no longer required and will be removed in the next version!
    • New syntax:
    data: MyCustomModel = PyFaDepends(MyCustomModel, _type=Header)
data: MyCustomModel = PyFaDepends(MyCustomModel, _type=Form)

data: MyCustomModel = FormDepends(MyCustomModel)
data: MyCustomModel = QueryDepends(MyCustomModel)
    • Added support for parameters specific only to FastAPI types in Pydantic Field. Example - Field(None, convert_underscores=True)
    opened by dotX12 0
  • error when adding Field constraint

    error when adding Field constraint

    On:

    python: 3.10 and 3.11 pyfa-converter: 1.0.3.0 (and master, which shows as 1.0.1.0) pydantic: 1.10.2

    If you add a Field constraint, pydantic raises a ValueError:

    For example, for the class in this repo, if you change it to (adding a gt constraint of 10:

    class PostContractSmallDoubleBodySchema(BaseModel):
    id: Optional[int] = Field(None, description="gwa", gt=10)
    title: Optional[str] = Field(None)
    data: Optional[List[int]]

    pydantic raises the following exception

    ImportError while loading conftest '/home/ben/repos/pyfa-converter/tests/conftest.py'.
tests/conftest.py:6: in <module>
    from examples.main import app
examples/main.py:47: in <module>
    @app.post("/test")
.venv/lib/python3.11/site-packages/fastapi/routing.py:630: in decorator
    self.add_api_route(
.venv/lib/python3.11/site-packages/fastapi/routing.py:569: in add_api_route
    route = route_class(
.venv/lib/python3.11/site-packages/fastapi/routing.py:438: in __init__
    self.dependant = get_dependant(path=self.path_format, call=self.endpoint)
.venv/lib/python3.11/site-packages/fastapi/dependencies/utils.py:292: in get_dependant
    sub_dependant = get_param_sub_dependant(
.venv/lib/python3.11/site-packages/fastapi/dependencies/utils.py:122: in get_param_sub_dependant
    return get_sub_dependant(
.venv/lib/python3.11/site-packages/fastapi/dependencies/utils.py:158: in get_sub_dependant
    sub_dependant = get_dependant(
.venv/lib/python3.11/site-packages/fastapi/dependencies/utils.py:299: in get_dependant
    param_field = get_param_field(
.venv/lib/python3.11/site-packages/fastapi/dependencies/utils.py:388: in get_param_field
    annotation = get_annotation_from_field_info(annotation, field_info, param_name)
pydantic/schema.py:1011: in pydantic.schema.get_annotation_from_field_info
    ???
E   ValueError: On field "id" the following field constraints are set but not enforced: gt.
E   For more details see https://pydantic-docs.helpmanual.io/usage/schema/#unenforced-field-constraints

    I spent some time investigating and I'm still not sure why this is happening

    bug fixed 
    opened by falkben 9
Releases(1.0.4.0a)
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