BaseTen

BaseTen Publisher's Description:
BaseTen is a new, open source Cocoa database framework for working with PostgreSQL databases, designed with familiar, Core Data -like semantics and APIs. With this 1.0 Release Candidate 1 version, a final 1.0 release is very near and it is safe to start development with the current BaseTen API. The BaseTen feature highlights include:

* BaseTen Assistant imports Core Data / Xcode data models
* Discovers the database schema automatically at runtime, including 1-1, 1-many and many-many relationships
* Database changes are propagated to clients automatically, without polling
* In-memory database objects are uniqued, and objects fetched via relationships are faults by default
* Support for RDBMS features like database-driven data validation, multi-column primary keys and updateable views
* Autocommit and manual save/rollback modes, both with NSUndoManager integration
* A BaseTen-aware NSArrayController subclass automates locking and change propagation
* Fetches are specified with NSPredicates (the relevant portions of which are evaluated on the database)