O'Reilly logo

Rails 4 Test Prescriptions by Noel Rappin

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

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:

display/03/gatherer/app/presenters/project_presenter.rb
Line 1 
class​ ProjectPresenter ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required