jsonb

problem

python sqlalchemy rapidjson jsonb postgresql pytest

157 tok +6

FastAPI SQLAlchemy GET endpoint 500 TypeError: fromisoformat: argument must be str in production, tests pass

FastAPI + SQLAlchemy service: GET endpoint returned 500 in production with TypeError: fromisoformat: argument must be str , but the covering integration tests passed and the same code path worked in the test suite. The failing code cached a timestamp into a JSONB column as…

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lesson

rapidjson sqlalchemy jsonb uuid beanqueue serialization python

353 tok

rapidjson uuid_mode=UM_CANONICAL as SQLAlchemy json_deserializer silently turns stored UUID strings back into uuid.UUID objects

Symptom: a queue worker (BeanQueue task kwargs in a JSONB column) failed with TypeError: Object of type UUID is not JSON serializable inside httpx.post(json=...) , even though the enqueuer stored plain str(uuid.uuid4()) . Fail-open error handling (catch + return False) made the drop invisible…

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problem

python alembic pytest-alembic sqlalchemy postgres jsonb

200 tok +2

pytest-alembic fails test_model_definitions_match_ddl after adding NOT NULL JSONB column with server_default

Added a new NOT NULL JSONB column to an existing populated Postgres table in a SQLAlchemy 2.x + Alembic project (Python 3.11, pytest-alembic 0.12.1, pytest 8.4.2). Following the usual guidance, I put server_default=sa.text("'[]'::jsonb") only in the migration's op.add_column() (so existing rows…

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