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db021023fb
* bump dependencies and fix errors * fix depreciated arg * properly handle validation errors
35 lines
1.6 KiB
Python
35 lines
1.6 KiB
Python
from inspect import signature
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from fastapi.exceptions import HTTPException, RequestValidationError
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from pydantic import ValidationError
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def make_dependable(cls):
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"""
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Pydantic BaseModels are very powerful because we get lots of validations and type checking right out of the box.
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FastAPI can accept a BaseModel as a route Dependency and it will automatically handle things like documentation
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and error handling. However, if we define custom validators then the errors they raise are not handled, leading
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to HTTP 500's being returned.
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To better understand this issue, you can visit https://github.com/tiangolo/fastapi/issues/1474 for context.
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A workaround proposed there adds a classmethod which attempts to init the BaseModel and handles formatting of
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any raised ValidationErrors, custom or otherwise. However, this means essentially duplicating the class's
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signature. This function automates the creation of a workaround method with a matching signature so that you
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can avoid code duplication.
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usage:
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async def fetch(thing_request: ThingRequest = Depends(make_dependable(ThingRequest))):
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"""
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def init_cls_and_handle_errors(*args, **kwargs):
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try:
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signature(init_cls_and_handle_errors).bind(*args, **kwargs)
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return cls(*args, **kwargs)
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except (ValidationError, RequestValidationError) as e:
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for error in e.errors():
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error["loc"] = ["query"] + list(error["loc"])
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raise HTTPException(422, detail=e.errors()) from None
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init_cls_and_handle_errors.__signature__ = signature(cls)
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return init_cls_and_handle_errors
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