add backlogs custom filters

config/locales/en.yml

@@ -6,3 +6,6 @@ en:
   field_story_points: "Story points"
   field_remaining_hours: "Remaining hours"
   button_edit_wiki: "Edit wiki page"
+  field_backlogs_issue_type: "Backlog type"
+  backlogs_story: Story
+  backlogs_task: Task

lib/query_patch.rb

@@ -3,14 +3,62 @@ require_dependency 'query'
 module QueryPatch
     def self.included(base) # :nodoc:
         base.extend(ClassMethods)
+        base.send(:include, InstanceMethods)
 
         # Same as typing in the class 
         base.class_eval do
             unloadable # Send unloadable so it will not be unloaded in development
             base.add_available_column(QueryColumn.new(:story_points, :sortable => "#{Issue.table_name}.story_points"))
             base.add_available_column(QueryColumn.new(:remaining_hours, :sortable => "#{Issue.table_name}.remaining_hours"))
+
+            alias_method_chain :available_filters, :backlogs_issue_type
+            alias_method_chain :sql_for_field, :backlogs_issue_type
+        end
+
+    end
+
+    module InstanceMethods
+        def available_filters_with_backlogs_issue_type
+            @available_filters = available_filters_without_backlogs_issue_type
+
+            if Story.trackers.length == 0 and not Task.tracker.nil?
+                backlogs_filters = { }
+            else
+                backlogs_filters = { "backlogs_issue_type" => { :type => :list, :values => [[l(:backlogs_story), "story"], [l(:backlogs_task), "task"]], :order => 20 } }
+            end
+
+            return @available_filters.merge(backlogs_filters)
+        end
+
+        def sql_for_field_with_backlogs_issue_type(field, operator, v, db_table, db_field, is_custom_filter=false)
+            if field == "backlogs_issue_type"
+                db_table = Issue.table_name
+
+                sql = []
+
+                values_for(field).each { |val|
+                    case val
+                        when "story"
+                            sql << "(#{db_table}.tracker_id in (" + Story.trackers.collect{|val| "#{val}"}.join(",") + ") and #{db_table}.parent_id is NULL)"
+                        when "task"
+                            sql << "(#{db_table}.tracker_id = #{Task.tracker} and not #{db_table}.parent_id is NULL)"
+                    end
+                }
+
+                case operator
+                    when "="
+                        sql = sql.join(" or ")
+                    when "!"
+                        sql = "not (" + sql.join(" or ") + ")"
                 end
 
+                return sql
+        
+            else
+                return sql_for_field_without_backlogs_issue_type(field, operator, v, db_table, db_field, is_custom_filter)
+            end
+      
+        end
     end
     
     module ClassMethods