Provide prefix filter method for queries

app/models/additionals_query.rb

@@ -4,6 +4,10 @@ module AdditionalsQuery
   end
 
   module InstanceMethods
+    def column_with_prefix?(prefix)
+      columns.detect { |c| c.name.to_s.start_with?("#{prefix}.") }.present?
+    end
+
     def available_column_names(options = {})
       names = available_columns.dup
       names.flatten!