pydynox 0.9.0

A fast DynamoDB ORM for Python with a Rust core

pydynox 🐍⚙️

A fast DynamoDB ORM for Python with a Rust core.

⚠️ Early Development: This project is not ready for production yet. The API may change before v1.0.

We welcome feedback and contributions! Check the open issues to see what's planned or to share your ideas.

Why "pydynox"?

Py(thon) + Dyn(amoDB) + Ox(ide/Rust)

GenAI Contributions 🤖

This project welcomes GenAI-assisted contributions! Parts of the code and docstrings were written with AI help.

If you're using AI tools to contribute, check the .ai/ folder. It has all the guidelines:

• .ai/README.md - Quick start for AI agents
• .ai/project-context.md - What is pydynox, tech stack
• .ai/coding-guidelines.md - Code style, Python vs Rust decisions
• .ai/testing-guidelines.md - How to write tests
• .ai/common-mistakes.md - Things that break the build

Rules for AI-assisted contributions:

• Follow the project's coding style and patterns
• Make sure the code makes sense and is tested
• Don't submit random or low-quality generated code
• Review and understand what the AI generated before submitting

Features

• Simple class-based API like PynamoDB
• Fast serialization with Rust
• Batch operations with auto-splitting
• Transactions
• Global Secondary Indexes
• Async support
• Pydantic integration

Installation

pip install pydynox

For Pydantic support:

pip install pydynox[pydantic]

Quick Start

Define a Model

from pydynox import Model, ModelConfig, String, Number, Boolean, List

class User(Model):
    model_config = ModelConfig(table="users")
    
    pk = String(hash_key=True)
    sk = String(range_key=True)
    name = String()
    email = String()
    age = Number(default=0)
    active = Boolean(default=True)
    tags = List(String)

CRUD Operations

# Create
user = User(pk="USER#123", sk="PROFILE", name="John", email="[e-mail]")
user.save()

# Read
user = User.get(pk="USER#123", sk="PROFILE")

# Update
user.name = "John Doe"
user.save()

# Delete
user.delete()

Query

from pydynox import Condition

# Simple query
users = User.query(pk="USER#123")

# With filters
users = User.query(pk="USER#123") \
    .where(Condition.begins_with("sk", "ORDER#")) \
    .where(Condition.gt("age", 18)) \
    .exec()

# Iterate (auto pagination)
for user in users:
    print(user.name)

Conditions

from pydynox import Condition

# Save with condition
user.save(condition=Condition.not_exists("pk"))

# Delete with condition
user.delete(condition=Condition.eq("version", 5))

# Combine conditions
user.save(
    condition=Condition.not_exists("pk") | Condition.eq("version", 1)
)

Available conditions:

• Condition.eq(field, value) - equals
• Condition.ne(field, value) - not equals
• Condition.gt(field, value) - greater than
• Condition.gte(field, value) - greater than or equal
• Condition.lt(field, value) - less than
• Condition.lte(field, value) - less than or equal
• Condition.exists(field) - attribute exists
• Condition.not_exists(field) - attribute does not exist
• Condition.begins_with(field, prefix) - string starts with
• Condition.contains(field, value) - string or list contains
• Condition.between(field, low, high) - value in range

Atomic Updates

from pydynox import Action

# Simple set
user.update(name="New Name", email="[e-mail]")

# Increment a number
user.update(Action.increment("age", 1))

# Append to list
user.update(Action.append("tags", ["verified"]))

# Remove field
user.update(Action.remove("temp_field"))

# Combine with condition
user.update(
    Action.increment("age", 1),
    condition=Condition.eq("status", "active")
)

Batch Operations

# Batch write
with User.batch_write() as batch:
    batch.save(user1)
    batch.save(user2)
    batch.delete(user3)

# Batch get
users = User.batch_get([
    ("USER#1", "PROFILE"),
    ("USER#2", "PROFILE"),
])

Global Secondary Index

from pydynox import GlobalIndex, ModelConfig

class User(Model):
    model_config = ModelConfig(table="users")
    
    pk = String(hash_key=True)
    sk = String(range_key=True)
    email = String()
    
    email_index = GlobalIndex(hash_key="email")

# Query on index
users = User.email_index.query(email="[e-mail]")

Transactions

with User.transaction() as tx:
    tx.save(user1)
    tx.delete(user2)
    tx.update(user3, Action.increment("age", 1))

Async Support

# All methods work with await
user = await User.get(pk="USER#123", sk="PROFILE")
await user.save()

async for user in User.query(pk="USER#123"):
    print(user.name)

Pydantic Integration

from pydynox import dynamodb_model
from pydantic import BaseModel, EmailStr

@dynamodb_model(table="users", hash_key="pk", range_key="sk")
class User(BaseModel):
    pk: str
    sk: str
    name: str
    email: EmailStr
    age: int = 0

# All pydynox methods available
user = User(pk="USER#123", sk="PROFILE", name="John", email="[e-mail]")
user.save()

Table Management

# Create table
User.create_table()

# Create with custom capacity
User.create_table(read_capacity=10, write_capacity=5)

# Create with on-demand billing
User.create_table(billing_mode="PAY_PER_REQUEST")

# Check if table exists
if not User.table_exists():
    User.create_table()

# Delete table
User.delete_table()

Documentation

Full documentation: https://leandrodamascena.github.io/pydynox

License

MIT License

Inspirations

This project was inspired by:

• PynamoDB - The ORM-style API and model design
• Pydantic - Data validation patterns and integration approach
• dynarust - Rust DynamoDB client patterns
• dyntastic - Pydantic + DynamoDB integration ideas

Building from Source

Requirements

• Python 3.11+
• Rust 1.70+
• maturin

Setup

# Clone the repo
git clone https://github.com/leandrodamascena/pydynox.git
cd pydynox

# Install maturin
pip install maturin

# Build and install locally
maturin develop

# Or with uv
uv run maturin develop

Running Tests

# Install dev dependencies
pip install -e ".[dev]"

# Run tests
pytest