diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index a230688dc..482dc4d45 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -438,13 +438,27 @@ class UsersController < ApplicationController
       # Description 所有动态
       where_condition = nil;
       # where_condition = "act_type <> 'JournalsForMessage'"
+      user_ids = []
       if @user == User.current
         watcher = User.watched_by(@user)
         watcher.push(User.current)
-        activity = Activity.where(where_condition).where('user_id in (?)', watcher).order('id desc')
+        user_ids = watcher.map{|x| x.id}
       else
-        activity = Activity.where(where_condition).where('user_id = ?', @user.id).order('id desc')
+        user_ids << @user.id
       end
+      activity = Activity.where(where_condition).where(user_id: user_ids).order('id desc')
+
+      #Issue
+      # act_ids = Activity.where(act_type: 'Issue', user_id: user_ids).select('act_id').map{|x| x.act_id}
+      # project_ids = Issue.where(id: act_ids).select('distinct project_id').map{|x| x.project_id}
+      # valid_p_ids = []
+      # Project.where(id: project_ids).each do |x|
+      #  x.visible?(User.current)
+      #  valid_p_ids << x.id
+      # end 
+
+      # activity = Activity.where(act_id: Issue.where(id: act_ids, project_id: valid_p_ids).map{|x| x.id}).order('id desc')
+
       # activity = activity.reject { |e|
       #       e.act.nil? ||
       #       (!User.current.admin? && !e.act.nil?
@@ -457,11 +471,6 @@ class UsersController < ApplicationController
       @activity_count = activity.count
       @activity_pages = Paginator.new @activity_count, pre_count, params['page']
       @activity = activity.slice(@activity_pages.offset,@activity_pages.per_page)
-      # @activity = @activity.reject { |e|
-      #   ((e.act_type=="Issue") && ( !e.act.visible?(User.current))) ||
-      #       ((e.act_type == "Journal") && (!e.act.project.visible?(User.current))) ||
-      #       ((e.act_type == "Bid") && ((!User.current.member_of_course?(e.act.courses.first) || !User.current.admin?)))
-      # }
       @state = 0
     end
     
diff --git a/app/models/mailer.rb b/app/models/mailer.rb
index df23813cd..39c38b269 100644
--- a/app/models/mailer.rb
+++ b/app/models/mailer.rb
@@ -775,9 +775,9 @@ class Mailer < ActionMailer::Base
         end
       end
     elsif reps.is_a? String
-      u = User.find_by_mail(r)
+      u = User.find_by_mail(reps)
       if u && u.mail_notification == 'all'
-        r_reps << r
+        r_reps << reps
       end
     end
     r_reps
diff --git a/app/models/user.rb b/app/models/user.rb
index 35c29cbcc..59c0ab608 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -766,7 +766,7 @@ class User < Principal
   # * nil with options[:global] set : check if user has at least one role allowed for this action,
   #   or falls back to Non Member / Anonymous permissions depending if the user is logged
   def allowed_to?(action, context, options={}, &block)
-    if context && context.is_a?(Project)
+    if Project === context
       return false unless context.allows_to?(action)
       # Admin users are authorized for anything else
       return true if admin?
@@ -779,7 +779,7 @@ class User < Principal
         (block_given? ? yield(role, self) : true)
       }
       #添加课程相关的权限判断
-    elsif context && context.is_a?(Course)
+    elsif Course === context
         return false unless context.allows_to?(action)
         # Admin users are authorized for anything else
         return true if admin?