## Using a Module
* To better organize your code written in the Model, place them into a module: `/models/concerns/..`
```ruby
module Blahh
extend ActiveSupport::Concern
module ClassMethods
# code in here
end
end
```
* The line containing `extend ActiveSupport::Concern` looks for a `ClassMethods` inner module.
* This line extends the methods defined within it, to class level scope! So as to remove the
need to type `self.` for every method.
* Finally, at the top of your model class definition: `include Concerns::NameOfConcernsFile`