Pydantic v2 cheatsheets. Pair with the textbook .
Pydantic Cheatsheet 11 — Performance
Cheatsheet: speed pitfalls and fixes; when to reach for msgspec.
Pydantic v2 Cheatsheets
Quick-reference cheatsheets for Pydantic v2 — fields, validators, serialization, types, settings.
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.
Pydantic Cheatsheet 17 — pydantic.dataclasses
Cheatsheet: pydantic.dataclass vs BaseModel, attrs comparison, stdlib dataclass conversion.
Pydantic Cheatsheet 18 — Common Domain Types (IDs, Money, Phone, Email)
Cheatsheet: branded ID types, Decimal for money, phone validation, EmailStr, AwareDatetime.
Pydantic Cheatsheet 19 — Testing Pydantic Models
Cheatsheet: parametrized tests, ValidationError assertions, factories, round-trip tests.
Pydantic Cheatsheet 20 — Migration v1 → v2
Cheatsheet: method renames, Config → model_config, validator decorators, codemod (bump-pydantic).