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Ultimate rspec matcher to test validation

After a first thousand of tests using Rspec I fount it very annoying to repeat my self testing the standard code as spec code is usually twice longer than code it test. I've started to look for a way to simplify the patterns and make it reusable. Among other nice rspec tricks there is possibility to write custom Rspec matchers. Spec the validation is just two lines of code for each attribute now.

Advanced non-flat controllers hierarchy with rails

REST became the best practice for organizing CRUD server side interface.
But what to do when we have something more than hello-world application that
goes forward from data CRUD and provides many presentations
of the same data with different filters and different layouts?

Advanced SQL and named scopes stack with ActiveRecord

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.