解决项目动态很慢，数据量很大的问题

lib/plugins/acts_as_activity_provider/lib/acts_as_activity_provider.rb

@@ -49,11 +49,8 @@ module Redmine
         end
 
         module ClassMethods
-          # Time 2015-01-27 13:37:41
-          # Author lizanle
-          # Description 应该保持原来的写法更加容易懂
           # Returns events of type event_type visible by user that occured between from and to
-          def find_events(event_type, user, from, to, options)
+          def find_events(event_type, user, days, created_time, options)
             provider_options = activity_provider_options[event_type]
             raise "#{self.name} can not provide #{event_type} events." if provider_options.nil?
 
@@ -94,23 +91,19 @@ module Redmine
               ActiveSupport::Deprecation.warn "acts_as_activity_provider with implicit :permission option is deprecated. Add a visible scope to the #{self.name} model or use explicit :permission option."
               scope = scope.scoped(:conditions => Project.allowed_to_condition(user, "view_#{self.name.underscore.pluralize}".to_sym, options))
             end
-            # Time 2015-01-27 13:34:40
+            # Time 2015-01-27 15:18:33
             # Author lizanle
-            # Description 这段代码就用scope.all进行了查询，拖慢了速度，并且增加了时间跨度，时间跨度应该由管理员来调整，所以应该去掉
-=begin
-            unless scope.all(provider_options[:find_options].dup).first.nil?
+            # Description 删除 unless scope.all，因为这个执行查询，并且没有加入时间限制，与下边 scope.all(provider_options[:find_options].dup)的重复查询
+            if options[:course]
               if provider_options[:timestamp].include? "updated_on"
                 to = scope.scoped(:order => "#{provider_options[:timestamp]} desc").all(provider_options[:find_options].dup).first.updated_on
               else
                 to = scope.scoped(:order => "#{provider_options[:timestamp]} desc").all(provider_options[:find_options].dup).first.created_on
               end
-              if options[:course]
                 from = (to - days.days) > created_time ? (to - days.days) : created_time.to_date
-              else
-                from =  to - days.day - 1.years
-              end
+            else
+                from =  to - Setting.activity_days_default.to_i
             end
-=end
 
             if from && to
               scope = scope.scoped(:conditions => ["#{provider_options[:timestamp]} BETWEEN ? AND ?", from, to])