Rails 4 Test Prescriptions

Presenters

Testing helpers is handy, but if you have a lot of logic in your helpers, I recommend moving the logic into presenter objects. This is especially true if you have a series of helpers that take the same argument.

There’s nothing complicated about using presenters in Rails; I often roll my own using Ruby’s SimpleDelegator class. If you want a little more structure, you can use the draper gem.^[11]

We can convert the project helper to a project presenter. This version of the code uses SimpleDelegator and includes a method for converting a list of projects into a list of presenters. In a break from our usual convention, I’ll show you the code first:

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