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If you ever work with rails application that is a little bit more complex then a simple CRUD you would know that some of the ActiveRecord magic doesn’t work for complex SQL queries. I am primary talking about named scopes stack feature.
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About half of a year ago I was writing about object interface and Liskov Substitution Princeple. In short: Any class instance that extends the base class should pass all unit tests behaviour tests written for base class instance. It was a surprise for me that this concept has already been implemented in RSpec.

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