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[REBOL] Business Object Versioning

From: robert:muench:robertmuench at: 5-Apr-2002 10:42

Hi, my current applications uses object! to define a set of business objects the application than manipulates. While further developing the application the definition of those objects might change. New releases need to update the older business objects on-the-fly to keep it as simple as possible for the user. To be able to do this I have a migration function that transforms an old object step by step to the newest version. The pattern is like this: migrate: func [...] [ if old_object/business_object_version = 1.0.0 [ ; update to 1.1.0 ] if old_object/business_object_version = 1.1.0 [ ; update to 1.2.3 ] ... ] What needs to be done to update an object? Well, there are only four things: 1. Add a new variable and value to an object 2. Rename a variable in an object 3. Delete a variable from an object 4. Set a different value for an existing variable in an object I really would like to have object manipulation functions for 1, 2 and 3. Where 1 can be solved by short function;-). Does anybody has a good idea how to do 2. and 3.? Robert