Rapid Web Applications with TurboGears: Using Python to Create Ajax-Powered Sites

Chapter A.10. Class Definitions

The most direct path you can use to migrate your model definition is to use ActiveMapper. This section outlines the basic steps required to migrate from SQLObject to SQLAlchemy with ActiveMapper. Before getting into the detailed steps of doing a conversion, you can get a feel for the differences by looking at some code in both SQLAlchemy and SQLObject. We’ll go through the TurboGears Identity model class by class, showing the SQLObject version and then the SQLAlchemy with ActiveMapper version.

The Visit class for handling anonymous and authenticated site visitors is as follows:

 class Visit(SQLObject): class sqlmeta: table="visit" visit_key= StringCol( length=40, alternateID=True, alternateMethodName="by_visit_key") ...