Prevent internal server error when receiving a JSON request body with non-object top-level structure

[drderuiter]

When the BodyGetter class has to deal with a JSON that does not have an object as the top-level structure, it crashes. To replicate this behavior, simply send a POST request with request body ["foo"] in the demo, or run the test scenario added in this PR without the changes to the BodyGetter.

Seeing as the request body is always parsed to a Pydantic model, and never to a nested structure like List[<MyPydanticModel>], this change does not alter any behavior except for returning a 400 whenever a 500 would have been returned otherwise.

WDYT?

Awesome package, by the way!

[codecov-io]

Codecov Report

Merging #9 (13041af) into main (c6b979d) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   92.64%   92.67%   +0.03%     
==========================================
  Files          11       11              
  Lines         666      669       +3     
==========================================
+ Hits          617      620       +3     
  Misses         49       49              

Impacted Files	Coverage Δ
aiohttp_pydantic/__init__.py	100.00% <100.00%> (ø)
aiohttp_pydantic/injectors.py	94.80% <100.00%> (+0.21%)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update c6b979d...13041af. Read the comment docs.

[Maillol]

Thank you for your contribution.

I would like that aiohttp-pydantic can accept a JSON that has a list as the top-level structure.

We can define a list as model using pydantic:

class Pets(BaseModel):
    __root__: List[str]

https://pydantic-docs.helpmanual.io/usage/models/

[Maillol]

Thank you!