A parent class for presenters to inherit from

presenter.rb

# Presenter is a parent class for all presenters to inherit from
#
# A Presenter is a view model and should be used to format and collect data
# that is to be presented in a view.
class Presenter
  include Rails.application.routes.url_helpers
  # Initialize your presenter with an object and optional view context
  # In your controller, you can pass in the `view_context` variable
  def initialize(object, view = nil)
    @object = object
    @view = view
  end

  # Convenience method that allows you to alias the object name
  # `presents :a_name` will alias @object to `a_name`
  def self.presents(name)
    define_method(name) do
      @object
    end
  end
  private_class_method :presents

  private

  # If a method we call is missing, pass the call onto
  # the object presented. If it's still not found, raise appropriate error.
  def method_missing(m, *args, &block)
    context = caller
    @object.send(m, *args, &block)
  rescue NoMethodError
    raise NoMethodError,
          "undefined method `#{m}' for #{self} and the presented #{@object}",
          context
  end

  # v is an alias for the view context
  def v
    @view
  end
end