custom resource scope, add scope assert_valid_keys

Author: radinreth

lib/liquid-rails/drops/collection_drop.rb

@@ -29,7 +29,7 @@ def self.scope(*scope_names)
       delegate :total_count, :total_pages, to: :objects
 
       def initialize(objects, options={})
-        options.assert_valid_keys(:with)
+        options.assert_valid_keys(:with, :scope)
 
         @objects         = objects
         @drop_class_name = options[:with]

lib/liquid-rails/drops/drop.rb

@@ -39,14 +39,13 @@ def self.drop_class_for(resource)
       end
 
       # Create a drop instance when it cannot be inferred.
-      def self.dropify(resource, options={})
-        binding.pry
+      def self.dropify(wealth, options={})
         drop_class = if options[:class_name]
           options[:class_name].constantize
         else
-          drop_class_for(resource)
+          drop_class_for(wealth)
         end
-        # eval "resource.#{options[:scope]}"
+        resource = options[:scope].nil? ? wealth : eval("wealth.#{options[:scope]}")
         drop_class.new(resource, options.except(:class_name))
       end