Vellum

Overview

A type-safe async MongoDB ODM for Python built as a precision alternative to Beanie. Designed around Pydantic v2 and Python async/await for FastAPI-native usage with full type inference throughout the query layer.

Key Features

• Q-Object Queries — Django-inspired query composition with full type safety
• Optimistic Concurrency Control — Version-based conflict detection for concurrent writes
• Lifecycle Hooks — Before/after hooks for insert, update, and delete operations
• Soft Deletes — First-class support for logical deletion without data loss
• Pydantic v2 Native — Built on Pydantic v2 models with full type inference
• AsyncIO First — Designed for async/await from the ground up; FastAPI-native

Tech Stack

• Language: Python
• Database: MongoDB
• Validation: Pydantic v2
• Runtime: AsyncIO