6 months ago
Today, after deploying new version of an FastAPI application, I can see that Swagger (`/docs`) is not working, returning 500 error. I tried reverting the app to a previous version, but that didn't help at all, which makes me believe it's something on Railway rather then with my code.
App in question can be found at https://b.subjective.agency (this would redirect to /docs, which is a custom-set behavior, but then the Swagger would fail.).
In addition, here's the trace of that 500:
Traceback (most recent call last):
File "/usr/local/lib/python3.12/site-packages/opentelemetry/trace/__init__.py", line 589, in use_span
yield span
File "/usr/local/lib/python3.12/site-packages/opentelemetry/instrumentation/asgi/__init__.py", line 743, in __call__
await self.app(scope, otel_receive, otel_send)
File "/usr/local/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 79, in __call__
raise exc
File "/usr/local/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 68, in __call__
await self.app(scope, receive, sender)
File "/usr/local/lib/python3.12/site-packages/fastapi/middleware/asyncexitstack.py", line 20, in __call__
raise e
File "/usr/local/lib/python3.12/site-packages/fastapi/middleware/asyncexitstack.py", line 17, in __call__
await self.app(scope, receive, send)
File "/usr/local/lib/python3.12/site-packages/starlette/routing.py", line 718, in __call__
await route.handle(scope, receive, send)
File "/usr/local/lib/python3.12/site-packages/starlette/routing.py", line 276, in handle
await self.app(scope, receive, send)
File "/usr/local/lib/python3.12/site-packages/starlette/routing.py", line 66, in app
response = await func(request)
^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/fastapi/applications.py", line 247, in openapi
return JSONResponse(self.openapi())
^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/fastapi/applications.py", line 219, in openapi
self.openapi_schema = get_openapi(
^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/fastapi/openapi/utils.py", line 483, in get_openapi
result = get_openapi_path(
^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/fastapi/openapi/utils.py", line 251, in get_openapi_path
operation_parameters = get_openapi_operation_parameters(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/fastapi/openapi/utils.py", line 106, in get_openapi_operation_parameters
param_schema = get_schema_from_model_field(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/fastapi/_compat.py", line 202, in get_schema_from_model_field
] = field.field_info.title or field.alias.title().replace("_", " ")
^^^^^^^^^^^^^^^^^
AttributeError: 'Depends' object has no attribute 'title'Depends is a special object in FastAPI used for injecting dependencies. I updated FastAPI to most recent version, but that changed nothing.
2 Replies
6 months ago
As this may or may not be related:
Currently, I can't build an app at all: it tries to take a snapshot of the code and fails with Unexpected EOF. Not sure what's going on here.
6 months ago
We have shipped a fix for this issue, and you should no longer experience this error. Please let us know whether you're continuing to see issues.
Status changed to Awaiting User Response railway[bot] • 6 months ago