acts-as-joinable.rb in acts-as-joinable-0.1.4

- old
+ new

@@ -1,5 +1,6 @@
+# https://rails.lighthouseapp.com/projects/8994/tickets/5182-activerecordcalculations-returns-incorrect-data-when-grouping-by-multiple-fields
 module ActsAsJoinable
   
   def self.models
     unless @models
       if defined?(Rails)
@@ -40,9 +41,18 @@
           end
           
           include ActsAsJoinable::Core
         end
       end
+    end
+    
+    # Group.count_joins(:as => :parent, :conditions)
+    def count_joins(options = {})
+      relationship  = options.delete(:as) || :parent
+      conditions    = options[:conditions] || {}
+      conditions["#{relationship.to_s}_type".to_sym] = ([self.name] + (self.send(:subclasses) - self.included_modules).map(&:name)).flatten.uniq
+      group         = options[:group] || "#{relationship}_id"
+      ActsAsJoinable::Relationship.count(:conditions => conditions, :group => group)
     end
     
     def acts_as_joinable
       acts_as_joinable_on
     end
\ No newline at end of file