Pydantic Cheatsheet 09 — pydantic-settings
Cheatsheet: BaseSettings, env_file, env_prefix, nested, secrets_dir, CLI integration.
Pydantic
Pydantic v2 Textbook Ch. 9 — Settings (pydantic-settings)
Pydantic-settings: typed env config, .env, secrets directory, sources, CLI integration.
Pydantic Cheatsheet 10 — JSON Schema and OpenAPI
Cheatsheet: model_json_schema modes, json_schema_extra, custom JSON Schema, LLM tools.
Pydantic v2 Textbook Ch. 10 — Performance, FastAPI Integration, and Alternatives
Pydantic v2 perf tips, hot path optimization, FastAPI patterns, and when to consider msgspec / attrs.
Pydantic Cheatsheet 11 — Performance
Cheatsheet: speed pitfalls and fixes; when to reach for msgspec.
Pydantic Cheatsheet 12 — Error Handling
Cheatsheet: ValidationError.errors(), loc / type / msg, custom error envelopes, FastAPI 400/422.
Pydantic Cheatsheet 13 — ORM Mode (from_attributes)
Cheatsheet: from_attributes=True, computed fields from ORM, eager-loading relations, exclude sensitive.
Pydantic Cheatsheet 14 — FastAPI Patterns
Cheatsheet: Read/Create/Update model trio, PATCH partial updates, Pagination class, filter from class.
Pydantic Cheatsheet 15 — Recursive Models and Forward References
Cheatsheet: self-referencing, model_rebuild, mutually recursive, tree / graph patterns.
Pydantic Cheatsheet 16 — Computed Fields
Cheatsheet: @computed_field, alias, exclude, type annotation, caching.