application_helper.rb in tramway-event-0.6

- old
+ new

@@ -1,6 +1,16 @@
+require "tramway/collection"
+
 module Tramway
   module Event
     module ApplicationHelper
+      def collection_list_by(name:)
+        require name # needed to load class name with collection
+        unless ::Tramway::Collection.descendants.map(&:to_s).include?(name.camelize)
+          raise "There no such collection named #{name.camelize}. Please create class with self method `list` and extended of `Tramway::Collection`" 
+        end
+
+        name.camelize.constantize.list
+      end
     end
   end
 end