Ferro: The Pydantic x Rust ORM
Ferro is an async ORM for Python: you declare Pydantic models, and a Rust engine builds the SQL, runs it and turns rows into model instances. Its runtime dependencies are Pydantic and pydantic-settings.
Here is a model, a query and the result:
import asyncio
from ferro import Field, Model, connect, engines
class User(Model):
id: int | None = Field(default=None, primary_key=True)
username: str
is_active: bool = True
async def main():
await connect("sqlite::memory:", auto_migrate=True)
async with engines.session():
await User.create(username="alice")
await User.create(username="bob", is_active=False)
active_users = await User.where(lambda user: user.is_active == True).all()
print(f"Found {len(active_users)} active users.")
asyncio.run(main())
Running it prints:
Found 1 active users.
Every ORM call runs inside async with engines.session():, which routes it to the connection you opened. auto_migrate=True creates the table on connect; it suits development and tests.
What Ferro does
- The Rust engine generates the SQL and parses rows outside the GIL, then fills each model's fields directly, without calling
__init__. - Everything is async, on
pyo3-async-runtimesand SQLx. - Models are Pydantic v2 models, so validation and IDE support work as they do for any Pydantic class.
- Within a session, one database row is one Python object (the identity map).
- It supports SQLite and PostgreSQL. Both are compiled into the engine, so no driver packages are needed.
Installation
Ferro ships pre-compiled wheels for macOS, Linux and Windows:
pip install ferro-orm
# With the migrations CLI (ferro migrate)
pip install "ferro-orm[cli]"
# With the Alembic bridge
pip install "ferro-orm[alembic]"
Schema changes
Auto-migrate keeps a development database current. For production, ferro migrate new writes reviewed migration files and ferro migrate up applies them; see Schema management. To use more than one database, register named connections with connect(..., name="..."); see Connections.
1 maintainer
Metadata
1 maintainer
Release files for ferro-orm 0.27.0
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | Actions |
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| ferro_orm-0.27.0.tar.gz | 2.9 MB | With provenance | Details for ferro_orm-0.27.0.tar.gz |
Built distributions (wheels)
| File | Actions Reset | |||
|---|---|---|---|---|
| ferro_orm-0.27.0-cp39-abi3-win_amd64.whl | CPython 3.9 | abi3 | Windows x86-64 | Details for ferro_orm-0.27.0-cp39-abi3-win_amd64.whl |
| ferro_orm-0.27.0-cp39-abi3-manylinux2014_x86_64.manylinux_2_17_x86_64.whl | CPython 3.9 | abi3 | Linux glibc 2.17+ x86-64 | Details for ferro_orm-0.27.0-cp39-abi3-manylinux2014_x86_64.manylinux_2_17_x86_64.whl |
| ferro_orm-0.27.0-cp39-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.whl | CPython 3.9 | abi3 | Linux glibc 2.17+ ARM64 | Details for ferro_orm-0.27.0-cp39-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.whl |
| ferro_orm-0.27.0-cp39-abi3-macosx_11_0_arm64.whl | CPython 3.9 | abi3 | macOS 11.0+ ARM64 | Details for ferro_orm-0.27.0-cp39-abi3-macosx_11_0_arm64.whl |
Total release size: 37.3 MB
Release files / ferro_orm-0.27.0.tar.gz
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