Invitation classes presenters

gistfile1.rb

# Models

module Invitations
  class Base
    belongs_to :sender
    belongs_to :recipient
  end

  class JoinGroup < Base
   ...
  end

  class BecomeManager < JoinGroup
   ...
  end
end

# Each has different email subject and body.
# The problem: do not want to add "email_subject" and "email_template" fields to the models.
# Solution: May be something like

module Decorators
  module Email
    # Can actually place any decorators for that are used specifically for emails here

    module Invitations
      class Base
        def subject
          "Join our cool website" # Options: return I18n key "join_website", or the value h.t("....join_website")
        end

        def template
          "invitation_base"
        end
      end

      class JoinGroup < Base
        def subject
          "You have been invited to join #{group.name}"
        end
 
        def template
          "invitation_join_group"
        end
      end

      class BecomeManager < Base
        def subject
          # Example of some logic that might be used
          if recipient.member_of?(group)
            "You have been invited to manage #{subordinate.name}"
          else
            "You have been invited to join #{group.name} and manage #{subordinate.name}"
          end
        end

        def template
          "invitation_become_manager"
        end
      end
    end
  end

  # We can actually place our presenters in a module like this one:
  # removing word "Presenter" from the class name of course...
  module Views
  end
end

# And use them

invitation = "Decorators::Email::#{invitation.class.name}".constantize.new
mail(to: invitation.recipient_email, subject: invitation.subject, template_name: invitation.template)