Recently, I was discussing adding a feature to an application which is about event creation and booking. The project manager has a strong database background and works on the schema himself. The schema is also his go-to tool to express changes in the features. But thinking about the real Domain in terms of objects revealed much, much more.

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Some time ago, I read about database design and mapping object hierarchies to database tables. Ruby on Rails’ default approach is to use a technique called Single-Table Inheritance. This design pattern has some drawbacks.

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