消息查询语句优化，添加索引

app/controllers/users_controller.rb

@@ -119,49 +119,46 @@ class UsersController < ApplicationController
     # @new_message_count = forge_querys.count + forum_querys.count + course_querys.count + user_querys.count
     case params[:type]
       when nil
+        # 系统消息为管理员发送，我的消息中包含有系统消息
         @message_alls = []
-        messages = MessageAll.where("(user_id =? and message_type !=?) or message_type =?" ,@user, "SystemMessage", "SystemMessage").order("created_at desc")
+        messages = MessageAll.where("(user_id =? and message_type !=?) or message_type =?" ,@user.id, "SystemMessage", "SystemMessage").includes(:message).order("created_at desc")
         messages.each do |message_all|
           @message_alls << message_all.message
         end
       when 'unviewed'
         @message_alls = []
-        messages = MessageAll.where("user_id =?", @user).order("created_at desc")
+        messages = MessageAll.where("user_id =?", @user.id).includes(:message).order("created_at desc")
         messages.each do |message_all|
           # 在点击或者刷新消息列表后未读的消息存放在数组
           if message_all.message_type != "SystemMessage"&& !message_all.message.nil? && message_all.message.viewed == 0
             @message_alls << message_all.message
           end
         end
-
       #课程相关消息
       when 'homework'
-        @message_alls = CourseMessage.where("course_message_type in ('HomeworkCommon','StudentWorksScore','JournalsForMessage','StudentWork','Exercise') and user_id =?",  @user).order("created_at desc")
+        @message_alls = CourseMessage.where("course_message_type in ('HomeworkCommon','StudentWorksScore','JournalsForMessage','StudentWork','Exercise') and user_id =?",  @user.id).order("created_at desc")
       when 'course_message'
-        @message_alls = CourseMessage.where("course_message_type =? and user_id =?", "Message", @user).order("created_at desc")
+        @message_alls = CourseMessage.where("course_message_type =? and user_id =?", "Message", @user.id).order("created_at desc")
       when 'course_news'
         # 课程通知包含发布的通知和回复的通知
-        @message_alls = CourseMessage.where("course_message_type in (?, ? ,?)", "News", "Comment", "Course").where("user_id =?", @user).order("created_at desc")
+        @message_alls = CourseMessage.where("course_message_type in ('News', 'Comment') and user_id =?", @user.id).order("created_at desc")
       when 'poll'
-        @message_alls = CourseMessage.where("course_message_type =? and user_id =?", "Poll", @user).order("created_at desc")
-
+        @message_alls = CourseMessage.where("course_message_type =? and user_id =?", "Poll", @user.id).order("created_at desc")
       #项目相关消息
       when 'issue'
-        @message_alls = ForgeMessage.where("forge_message_type =? or forge_message_type =?" , "Issue", "Journal").where("user_id=?", @user).order("created_at desc")
+        @message_alls = ForgeMessage.where("forge_message_type in ('Issue', 'Journal') and user_id =?" , @user.id).order("created_at desc")
       when 'forge_message'
-        @message_alls = ForgeMessage.where("forge_message_type =? and user_id =?", "Message", @user).order("created_at desc")
+        @message_alls = ForgeMessage.where("forge_message_type =? and user_id =?", "Message", @user.id).order("created_at desc")
       when 'forge_news'
-        @message_alls = ForgeMessage.where("forge_message_type in (?,?) and user_id =?", "News", "Comment", @user).order("created_at desc")
+        @message_alls = ForgeMessage.where("forge_message_type in (?,?) and user_id =?", "News", "Comment", @user.id).order("created_at desc")
       when 'apply'
-        @message_alls = ForgeMessage.where("forge_message_type in ('ProjectInvite', 'AppliedProject', 'JoinProject', 'RemoveFromProject') and user_id =?", @user).order("created_at desc")
-
+        @message_alls = ForgeMessage.where("forge_message_type in ('ProjectInvite', 'AppliedProject', 'JoinProject', 'RemoveFromProject') and user_id =?", @user.id).order("created_at desc")
       #贴吧消息
       when 'forum'
-        @message_alls = MemoMessage.where("memo_type =? and user_id =?", "Memo", @user).order("created_at desc")
-
+        @message_alls = MemoMessage.where("memo_type =? and user_id =?", "Memo", @user.id).order("created_at desc")
       #用户留言
       when 'user_feedback'
-        @message_alls = UserFeedbackMessage.where("journals_for_message_type =? and user_id =?", "JournalsForMessage", @user).order("created_at desc")
+        @message_alls = UserFeedbackMessage.where("journals_for_message_type =? and user_id =?", "JournalsForMessage", @user.id).order("created_at desc")
       else
         render_404
         return

db/migrate/20160321071740_add_index_to_message_alls.rb

@@ -0,0 +1,5 @@
+class AddIndexToMessageAlls < ActiveRecord::Migration
+  def change
+    add_index :message_alls, [:user_id, :message_id, :message_type, :created_at]
+  end
+end

db/migrate/20160321073042_add_index_to_course_messages.rb

@@ -0,0 +1,5 @@
+class AddIndexToCourseMessages < ActiveRecord::Migration
+  def change
+    add_index :course_messages, [:user_id, :course_id, :created_at]
+  end
+end

db/migrate/20160321073107_add_index_to_memo_messages.rb

@@ -0,0 +1,5 @@
+class AddIndexToMemoMessages < ActiveRecord::Migration
+  def change
+    add_index :memo_messages, [:user_id, :forum_id, :created_at]
+  end
+end

db/migrate/20160321073227_add_index_to_user_feedback_messages.rb

@@ -0,0 +1,5 @@
+class AddIndexToUserFeedbackMessages < ActiveRecord::Migration
+  def change
+    add_index :user_feedback_messages, [:user_id, :created_at]
+  end
+end

db/migrate/20160321075815_add_index_to_forge_messages.rb

@@ -0,0 +1,5 @@
+class AddIndexToForgeMessages < ActiveRecord::Migration
+  def change
+    add_index :forge_messages, [:user_id, :project_id,  :created_at]
+  end
+end

db/migrate/20160321080116_add_forgetype_to_forge_messages.rb

@@ -0,0 +1,5 @@
+class AddForgetypeToForgeMessages < ActiveRecord::Migration
+  def change
+    add_index :forge_messages, [:forge_message_id, :forge_message_type]
+  end
+end

db/migrate/20160321080336_add_usertype_to_user_feedback_messages.rb

@@ -0,0 +1,5 @@
+class AddUsertypeToUserFeedbackMessages < ActiveRecord::Migration
+  def change
+    add_index :user_feedback_messages, [:journals_for_message_id]
+  end
+end

db/migrate/20160321080412_add_memotype_to_memo_messages.rb

@@ -0,0 +1,5 @@
+class AddMemotypeToMemoMessages < ActiveRecord::Migration
+  def change
+    add_index :memo_messages, [:memo_id, :memo_type]
+  end
+end

db/migrate/20160321080825_add_feed_to_user_feedback_messages.rb

@@ -0,0 +1,5 @@
+class AddFeedToUserFeedbackMessages < ActiveRecord::Migration
+  def change
+    add_index :course_messages, [:course_message_type]
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20160317090350) do
+ActiveRecord::Schema.define(:version => 20160321080825) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false
@@ -465,6 +465,10 @@ ActiveRecord::Schema.define(:version => 20160317090350) do
     t.integer  "status"
   end
 
+  add_index "course_messages", ["course_message_id"], :name => "index_course_messages_on_course_message_id"
+  add_index "course_messages", ["course_message_type"], :name => "index_course_messages_on_course_message_type"
+  add_index "course_messages", ["user_id", "course_id", "created_at"], :name => "index_course_messages_on_user_id_and_course_id_and_created_at"
+
   create_table "course_statuses", :force => true do |t|
     t.integer  "changesets_count"
     t.integer  "watchers_count"
@@ -741,6 +745,9 @@ ActiveRecord::Schema.define(:version => 20160317090350) do
     t.integer  "status"
   end
 
+  add_index "forge_messages", ["forge_message_id", "forge_message_type"], :name => "index_forge_messages_on_forge_message_id_and_forge_message_type"
+  add_index "forge_messages", ["user_id", "project_id", "created_at"], :name => "index_forge_messages_on_user_id_and_project_id_and_created_at"
+
   create_table "forums", :force => true do |t|
     t.string   "name",                        :null => false
     t.text     "description"
@@ -1055,6 +1062,9 @@ ActiveRecord::Schema.define(:version => 20160317090350) do
     t.datetime "updated_at", :null => false
   end
 
+  add_index "memo_messages", ["memo_id", "memo_type"], :name => "index_memo_messages_on_memo_id_and_memo_type"
+  add_index "memo_messages", ["user_id", "forum_id", "created_at"], :name => "index_memo_messages_on_user_id_and_forum_id_and_created_at"
+
   create_table "memos", :force => true do |t|
     t.integer  "forum_id",                         :null => false
     t.integer  "parent_id"
@@ -1078,6 +1088,8 @@ ActiveRecord::Schema.define(:version => 20160317090350) do
     t.datetime "updated_at",   :null => false
   end
 
+  add_index "message_alls", ["message_id", "message_type", "created_at"], :name => "index_message_alls_on_message_id_and_message_type_and_created_at"
+
   create_table "messages", :force => true do |t|
     t.integer  "board_id",                         :null => false
     t.integer  "parent_id"
@@ -1830,6 +1842,9 @@ ActiveRecord::Schema.define(:version => 20160317090350) do
     t.datetime "updated_at",                :null => false
   end
 
+  add_index "user_feedback_messages", ["journals_for_message_id"], :name => "index_user_feedback_messages_on_journals_for_message_id"
+  add_index "user_feedback_messages", ["user_id", "created_at"], :name => "index_user_feedback_messages_on_user_id_and_created_at"
+
   create_table "user_grades", :force => true do |t|
     t.integer  "user_id",                     :null => false
     t.integer  "project_id",                  :null => false