830 articles — Page 9 of 70
How to fix Peewee errors — OperationalError database is locked, connection already open, field type mismatch, model meta database missing, N+1 queries, and peewee-migrate setup.
How to fix Tortoise ORM errors — Tortoise.init not called, no module imported model, fetch_related missing, aerich migration setup, FastAPI integration patterns, and ConfigurationError missing connection.
How to fix conda errors — solving environment takes hours, channel conflicts conda-forge vs defaults, CondaSSLError, conda activate not working in shell, pip and conda mixing breaking env, and mamba/libmamba solver.
How to fix psycopg errors — psycopg2 to psycopg 3 import migration, connection pool setup, row factory tuple vs dict, COPY protocol changes, async psycopg pool, server-side cursor confusion, and binary mode performance.
How to fix SQLModel errors — table not created without table=True, relationship not eager-loaded MissingGreenlet, AttributeError on lazy attribute, mixing Pydantic and Table classes, Optional vs default None, and async session setup.
How to fix Alembic errors — autogenerate not detecting model changes, Multiple head revisions, can't locate revision, downgrade fails, async engine support, and database URL configuration.
How to fix asyncpg errors — connection refused localhost 5432, pool exhausted timeout, prepared statement does not exist, type codec not registered, JSON automatic conversion, and transaction rollback on exception.
How to fix PDM errors — pdm install fails resolving dependencies, lock file outdated warning, __pypackages__ vs venv confusion, pdm run script not found, build backend missing, and dependency groups setup.
How to fix freezegun errors — freeze_time decorator not affecting datetime.now, timezone-aware datetime mismatch, time.time not frozen, async test time leak, third-party library still using real time, and tick parameter behavior.
How to fix Moto errors — mock not activating, real AWS credentials used in tests, ImportError mock_s3 removed in v5, fixtures with multiple services, NoCredentialsError despite mock, and standalone server mode.
How to fix Hatch errors — hatch env create fails, scripts not found, build backend hatchling missing, version not detected, plugin install errors, and publishing to PyPI.
How to fix Nox errors — no noxfile.py found, session not detected, virtualenv backend uv not installed, session.install fails outside virtualenv, parametrize matrix exploding, and reuse_venv confusion.