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# Features

* Add Python 3.9 support
* Allow to use kwargs in select: Entity.select(**kwargs) and obj.collection.select(**kwargs), a feature that was announced but actually missed from 0.7.7
* Add support for volatile collection attributes that don't throw "Phantom object appeared/disappeared" exceptions

# Bugfixes

* Fix negative timedelta conversions
* Pony should reconnect to PostgreSQL when receiving 57P01 error (AdminShutdown)
* Allow mixing compatible types (like int and float) in coalesce() arguments
* Support of subqueries in coalesce() arguments
* Fix using aggregated subqueries in ORDER BY section
* Fix queries with expressions like `(x, y) in ((a, b), (c, d))`
* #451: KeyError for seeds with unique attributes in SessionCache.update_simple_index()
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README.md

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Pony Object-Relational Mapper

Pony is an advanced object-relational mapper. The most interesting feature of Pony is its ability to write queries to the database using Python generator expressions and lambdas. Pony analyzes the abstract syntax tree of the expression and translates it into a SQL query.

Here is an example query in Pony:

select(p for p in Product if p.name.startswith('A') and p.cost <= 1000)

Pony translates queries to SQL using a specific database dialect. Currently Pony works with SQLite, MySQL, PostgreSQL and Oracle databases.

By providing a Pythonic API, Pony facilitates fast app development. Pony is an easy-to-learn and easy-to-use library. It makes your work more productive and helps to save resources. Pony achieves this ease of use through the following:

  • Compact entity definitions
  • The concise query language
  • Ability to work with Pony interactively in a Python interpreter
  • Comprehensive error messages, showing the exact part where an error occurred in the query
  • Displaying of the generated SQL in a readable format with indentation

All this helps the developer to focus on implementing the business logic of an application, instead of struggling with a mapper trying to understand how to get the data from the database.

See the example here

Support Pony ORM Development

Pony ORM is Apache 2.0 licensed open source project. If you would like to support Pony ORM development, please consider:

Become a backer or sponsor

Online tool for database design

Pony ORM also has the Entity-Relationship Diagram Editor which is a great tool for prototyping. You can create your database diagram online at https://editor.ponyorm.com, generate the database schema based on the diagram and start working with the database using declarative queries in seconds.

Documentation

Documenation is available at https://docs.ponyorm.org The documentation source is avaliable at https://github.com/ponyorm/pony-doc. Please create new documentation related issues here or make a pull request with your improvements.

License

Pony ORM is released under the Apache 2.0 license.

PonyORM community

Please post your questions on Stack Overflow. Meet the PonyORM team, chat with the community members, and get your questions answered on our community Telegram group. Join our newsletter at ponyorm.org. Reach us on Twitter.

Copyright (c) 2013-2019 Pony ORM. All rights reserved. info (at) ponyorm.org

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