邮件按天发送，内容按课程划分

app/models/mailer.rb

@@ -120,12 +120,12 @@ class Mailer < ActionMailer::Base
       count = courses.count
       count = count - 1
       for i in 0..count do
-        bids =  courses[i].homework_commons.where("homework_commons.created_at between '#{date_from}' and '#{date_to}'").order("homework_commons.created_at desc")
-        attachments = courses[i].attachments.where("attachments.created_on between '#{date_from}' and '#{date_to}'").order('attachments.created_on DESC')
+        bids =  courses[i].homework_commons.where("homework_commons.created_at between '#{date_from}' and '#{date_to}'").order(" '#{courses[i].id}', homework_commons.created_at desc")
+        attachments = courses[i].attachments.where("attachments.created_on between '#{date_from}' and '#{date_to}'").order(" '#{courses[i].id}',attachments.created_on DESC' ")
         @bids += bids if bids.count > 0
         @attachments += attachments if attachments.count > 0
       end
-      @bids  = @bids.sort_by { |obj| obj.created_at }
+      # @bids  = @bids.sort_by { |obj| obj.created_at }
     end
 
     # 项目附件
@@ -144,7 +144,7 @@ class Mailer < ActionMailer::Base
     course_mesages = Message.find_by_sql("select DISTINCT me.* from messages me, boards b, members m where
      b.id = me.board_id and b.course_id = m.course_id
      and b.course_id is not Null and m.user_id = '#{user.id}'
-     and (me.created_on between '#{date_from}' and '#{date_to}') order by created_on desc")
+     and (me.created_on between '#{date_from}' and '#{date_to}') order by m.course_id, created_on desc")
 
     # 查询user在项目中发布的讨论帖子
     project_messages = Message.find_by_sql("select DISTINCT me.* from messages me, boards b, members m where
@@ -168,11 +168,11 @@ class Mailer < ActionMailer::Base
     #  查询user在课程中发布的通知和回复通知
     @course_news = (course_ids && !course_ids.empty?) ? News.find_by_sql("select DISTINCT n.*  from news n
                                                 where n.course_id in (#{course_ids})
-                                                    and (created_on between '#{date_from}' and '#{date_to}') order by created_on desc") : []
+                                                    and (created_on between '#{date_from}' and '#{date_to}') order by n.course_id, created_on desc") : []
 
     @course_news_comments =  Comment.find_by_sql("select cm.* from comments cm, members m, courses c, news n
      where m.user_id = '#{user.id}' and c.id = m.course_id and n.course_id = c.id and cm.commented_id = n.id
-     and cm.commented_type ='News' and (cm.created_on between '#{date_from}' and '#{date_to}') order by created_on desc")
+     and cm.commented_type ='News' and (cm.created_on between '#{date_from}' and '#{date_to}') order by  m.course_id, created_on desc")
 
     # 查询user在项目中添加新闻和回复新闻
     @project_news = (project_ids && !project_ids.empty?) ? News.find_by_sql("select DISTINCT n.* from news n where  n.project_id in (#{project_ids})
@@ -180,19 +180,19 @@ class Mailer < ActionMailer::Base
 
     @project_news_comments =  Comment.find_by_sql("select c.* from comments c, members m, projects p, news n
      where m.user_id = '#{user.id}' and p.id = m.project_id and n.project_id = p.id and c.commented_id = n.id
-     and c.commented_type ='News' and (c.created_on between '#{date_from}' and '#{date_to}') order by created_on desc")
+     and c.commented_type ='News' and (c.created_on between '#{date_from}' and '#{date_to}') order by m.project_id, created_on desc")
 
     # 查询user在课程及个人中留言
     @course_journal_messages = JournalsForMessage.find_by_sql("select DISTINCT jfm.* from journals_for_messages jfm, members m, courses c
      where m.user_id = '#{user.id}' and c.id = m.course_id and jfm.jour_id = c.id
-     and jfm.jour_type='Course' and (jfm.created_on between '#{date_from}' and '#{date_to}') order by created_on desc")
+     and jfm.jour_type='Course' and (jfm.created_on between '#{date_from}' and '#{date_to}') order m.course_id, by created_on desc")
 
     @user_journal_messages = user.journals_for_messages.where("jour_type='Principal' and (created_on between '#{date_from}' and '#{date_to}')").order('created_on DESC')
 
     # 查询user在项目中留言（用户反馈）
     @project_journal_messages = JournalsForMessage.find_by_sql("select DISTINCT jfm.* from journals_for_messages jfm, members m, projects p
      where m.user_id = '#{user.id}' and p.id = m.project_id and jfm.jour_id = p.id
-     and jfm.jour_type='Project' and (jfm.created_on between '#{date_from}' and '#{date_to}') order by created_on desc")
+     and jfm.jour_type='Project' and (jfm.created_on between '#{date_from}' and '#{date_to}') order by  m.project_id, created_on desc")
 
     # 查询user新建贴吧或发布帖子
     @forums = Forum.find_by_sql("select  DISTINCT * from forums where creator_id = #{user.id} and (created_at between '#{date_from}' and '#{date_to}') order by created_at desc")