diff --git a/app/controllers/course_second_categories_controller.rb b/app/controllers/course_second_categories_controller.rb
index af368a8dc..e5c3366cd 100644
--- a/app/controllers/course_second_categories_controller.rb
+++ b/app/controllers/course_second_categories_controller.rb
@@ -8,7 +8,7 @@ class CourseSecondCategoriesController < ApplicationController
     tip_exception("毕设子目录不能重命名") if @category.category_type == "graduation"
     tip_exception("名称不能为空") if params[:name].blank?
     tip_exception("已存在同名子目录") if @course_module.course_second_categories.exists?(name: params[:name].strip)
-    @category.update_attributes(name: params[:name].strip)
+    @category.update_attributes!(name: params[:name].strip)
     normal_status(0, "更新成功")
   end
 
diff --git a/app/controllers/stages_controller.rb b/app/controllers/stages_controller.rb
index c62832365..d456c17e7 100644
--- a/app/controllers/stages_controller.rb
+++ b/app/controllers/stages_controller.rb
@@ -39,10 +39,13 @@ class StagesController < ApplicationController
   def update
     ActiveRecord::Base.transaction do
       begin
-        @stage.update_attributes(stage_params)
-        @stage.stage_shixuns.destroy_all
+        @stage.update_attributes!(stage_params)
         unless params[:shixun_id].blank?
-          params[:shixun_id].each do |shixun_id|
+          new_shixun_ids = params[:shixun_id] - @stage.stage_shixuns.pluck(:shixun_id)
+          delete_shixun_ids = @stage.stage_shixuns.pluck(:shixun_id) - params[:shixun_id]
+          @stage.stage_shixuns.where(shixun_id: delete_shixun_ids).destroy_all
+
+          new_shixun_ids.each do |shixun_id|
             shixun = Shixun.where(id: shixun_id).first
             @stage.stage_shixuns.create!(subject_id: @subject.id, shixun_id: shixun.id, position: @stage.stage_shixuns.count + 1) if shixun.present?
           end
@@ -50,7 +53,7 @@ class StagesController < ApplicationController
         @subject.update_attributes(updated_at: Time.now)
       rescue Exception => e
         uid_logger_error(e.message)
-        tip_exception("章节更新失败")
+        tip_exception(e.message)
         raise ActiveRecord::Rollback
       end
     end
diff --git a/app/controllers/subjects_controller.rb b/app/controllers/subjects_controller.rb
index cc0e06a38..5cbb2a462 100644
--- a/app/controllers/subjects_controller.rb
+++ b/app/controllers/subjects_controller.rb
@@ -207,7 +207,7 @@ class SubjectsController < ApplicationController
         end
       rescue Exception => e
         uid_logger(e.message)
-        tip_exception("发送失败")
+        tip_exception(e.message)
         raise ActiveRecord::Rollback
       end
     end
diff --git a/app/models/stage.rb b/app/models/stage.rb
index d255cddeb..db7b5c0b3 100644
--- a/app/models/stage.rb
+++ b/app/models/stage.rb
@@ -6,6 +6,6 @@ class Stage < ApplicationRecord
   has_many :stage_shixuns, -> { order("stage_shixuns.position ASC") }, dependent: :destroy
   has_many :shixuns, :through => :stage_shixuns
 
-  validates :name, length: { maximum: 30 }
+  validates :name, length: { maximum: 60 }
   validates :description, length: { maximum: 300 }
 end