fix: psycopg2 register_default_jsonb TypeError with InstrumentedConnection + stack tests#52
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fix: psycopg2 register_default_jsonb TypeError with InstrumentedConnection + stack tests#52
register_default_jsonb TypeError with InstrumentedConnection + stack tests#52Conversation
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3 issues found across 42 files
Prompt for AI agents (all issues)
Check if these issues are valid — if so, understand the root cause of each and fix them.
<file name="drift/stack-tests/django-redis/src/views.py">
<violation number="1" location="drift/stack-tests/django-redis/src/views.py:35">
P2: Use an explicit None check for timeout so that valid falsy values like 0 are honored.</violation>
</file>
<file name="drift/stack-tests/fastapi-postgres/src/app.py">
<violation number="1" location="drift/stack-tests/fastapi-postgres/src/app.py:270">
P2: `cur1`/`cur2` are closed before fetching results. Fetch within the cursor context to avoid using closed cursors.</violation>
</file>
<file name="drift/stack-tests/django-postgres/src/views.py">
<violation number="1" location="drift/stack-tests/django-postgres/src/views.py:204">
P2: `connection.connection` can be `None` on first access, causing this endpoint to fail with `AttributeError`. Ensure the connection is established before dereferencing the raw connection.</violation>
</file>
Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.
sohil-kshirsagar
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Jan 28, 2026
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| # This simulates what Django's PostgreSQL backend does: | ||
| # After getting a connection, it registers JSON/JSONB types | ||
| # This will fail if conn is InstrumentedConnection because | ||
| # register_type is a C extension that does strict type checking | ||
| psycopg2.extras.register_default_jsonb(conn, globally=False) |
Contributor
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i guess we weren't able to verify this with a normal django app?
sohankshirsagar
approved these changes
Jan 28, 2026
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Summary
Fixes a bug where Django admin panel fails with
TypeError: argument 2 must be a connection, cursor or Nonewhen using the SDK in RECORD mode. The issue was thatpsycopg2.extras.register_default_jsonb()is a C extension that performs strict type checking, and it rejected ourInstrumentedConnectionwrapper.Also introduces stack tests - a new category of tests that validate multiple instrumentations working together in realistic application architectures.
Changes
Bug Fix:
InstrumentedConnectionbefore passing toregister_default_jsonb,register_default_json, andregister_uuidfunctions in RECORD mode/db/register-jsonbin psycopg2 e2e testsStack Tests (
drift/stack-tests/):django-postgres- Django + psycopg2 (validates the fix)fastapi-postgres- FastAPI + psycopg asyncdjango-redis- Django + Redis cache/sessionsdrift/stack-tests/(separate from single-instrumentation e2e tests)Test Runner Improvements:
--instrumentation-onlyflag to run only single-instrumentation e2e tests--stack-onlyflag to run only stack tests-c/--concurrency Nflag (default: sequential)-h/--helpfor usage documentationCI Updates:
Documentation:
drift/stack-tests/README.mdexplaining stack testsThe stack tests uncovered a few bugs that will be addressed in follow-up PRs.