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Returning sqlalchemy Data Model

See original GitHub issue

Hello,

First, thanks for all your docker project generators as well as the fantastic documentation. They have been super useful in getting my project off the ground.

I’ve been following the sqlalchemy example at: https://fastapi.tiangolo.com/tutorial/sql-databases/.

I’m trying to return a sqlalchemy data model, but I am getting the following error:

Fatal Python error: Cannot recover from stack overflow.

Thread 0x00007f115f510700 (most recent call first):
  File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 78 in _worker
  File "/usr/local/lib/python3.7/threading.py", line 865 in run
  File "/usr/local/lib/python3.7/threading.py", line 917 in _bootstrap_inner
  File "/usr/local/lib/python3.7/threading.py", line 885 in _bootstrap

Current thread 0x00007f116c905700 (most recent call first):
  File "/usr/local/lib/python3.7/site-packages/sqlalchemy/util/langhelpers.py", line 834 in __getattr__
  File "/usr/local/lib/python3.7/site-packages/sqlalchemy/util/langhelpers.py", line 836 in __getattr__
  File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/attributes.py", line 190 in __getattr__
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 51 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 30 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 59 in jsonable_encoder
  File "/usr/local/lib/python3.7/site-packages/fastapi/encoders.py", line 31 in <dictcomp>
  ...
INFO: Stopping reloader process [2468]

If I modify the fastapi specific code: https://fastapi.tiangolo.com/tutorial/sql-databases/#create-your-fastapi-code

and parse the sqlalchemy response into a dictionary, it works fine:

@app.get("/users/{username}")
def read_user(username: str):
    user = get_user(username, db_session)
    user = {"name": user.id,  "email": user.email}
    return user

Thanks again. Been loving FastAPI so far.

Issue Analytics

  • State:closed
  • Created 5 years ago
  • Reactions:2
  • Comments:8 (4 by maintainers)

github_iconTop GitHub Comments

2reactions
nickc1commented, Feb 12, 2019

@LexSerest Thanks for the suggestion. It cleaned up my code quite a bit.

@tiangolo Just upgraded to v0.3.0 and it works flawlessly. Thanks for all your work! 👏 👍 😄

1reaction
nickc1commented, Feb 21, 2019

Yes!

Read more comments on GitHub >

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