diff --git a/app/controllers/users/question_banks_controller.rb b/app/controllers/users/question_banks_controller.rb
index e966b67e9..1f51b701c 100644
--- a/app/controllers/users/question_banks_controller.rb
+++ b/app/controllers/users/question_banks_controller.rb
@@ -18,8 +18,8 @@ class Users::QuestionBanksController < Users::BaseController
   def load_question_banks_solve_count
     question_bank_ids = @question_banks.map(&:id)
     @solve_count_map =
-      case params[:category]
-      when 'common', 'group' then
+      case params[:object_type]
+      when 'normal', 'group' then
         StudentWork.where(is_delete: false, work_status: [1, 2, 3]).joins(:homework_common)
           .where(homework_commons: { homework_bank_id: question_bank_ids })
           .group('homework_commons.homework_bank_id').count
@@ -42,14 +42,14 @@ class Users::QuestionBanksController < Users::BaseController
   end
 
   def query_params
-    params.permit(:type, :category, :course_list_id, :sort_by, :sort_direction)
+    params.permit(:type, :object_type, :course_list_id, :sort_by, :sort_direction)
   end
 
   def check_query_params!
     params[:type] = 'personal' if params[:type].blank? || !%w(personal publicly).include?(params[:type])
 
-    if params[:category].blank? || !%w(common group exercise poll gtask gtopic).include?(params[:category])
-      params[:category] = 'common'
+    if params[:object_type].blank? || !%w(normal group exercise poll gtask gtopic).include?(params[:object_type])
+      params[:object_type] = 'normal'
     end
 
     if params[:sort_by].blank? || !%w(updated_at name contributor).include?(params[:sort_by])
diff --git a/app/services/users/question_bank_service.rb b/app/services/users/question_bank_service.rb
index b17073a4f..7e640c6a5 100644
--- a/app/services/users/question_bank_service.rb
+++ b/app/services/users/question_bank_service.rb
@@ -22,8 +22,8 @@ class Users::QuestionBankService
     course_lists = CourseList.joins(relation_name).where.not(relation_name => { id: nil })
 
     category_condition =
-      case params[:category]
-      when 'common' then { homework_type: 1 }
+      case params[:object_type]
+      when 'normal' then { homework_type: 1 }
       when 'group' then { homework_type: 3 }
       when 'exercise' then { container_type: 'Exercise' }
       when 'poll' then { container_type: 'Poll' }
@@ -47,8 +47,8 @@ class Users::QuestionBankService
 
   def class_name
     @_class_name ||= begin
-      case params[:category]
-      when 'common', 'group'  then 'HomeworkBank'
+      case params[:object_type]
+      when 'normal', 'group'  then 'HomeworkBank'
       when 'exercise', 'poll' then 'ExerciseBank'
       when 'gtask'            then 'GtaskBank'
       when 'gtopic'           then 'GtopicBank'
@@ -58,8 +58,8 @@ class Users::QuestionBankService
   end
 
   def category_filter(relations)
-    case params[:category]
-    when 'common' then
+    case params[:object_type]
+    when 'normal' then
       relations.where(homework_type: 1)
     when 'group' then
       relations.where(homework_type: 3)
diff --git a/db/migrate/20190829084147_migrate_course_group_position.rb b/db/migrate/20190829084147_migrate_course_group_position.rb
new file mode 100644
index 000000000..3a71baae4
--- /dev/null
+++ b/db/migrate/20190829084147_migrate_course_group_position.rb
@@ -0,0 +1,11 @@
+class MigrateCourseGroupPosition < ActiveRecord::Migration[5.2]
+  def change
+    Course.all.each do |course|
+      if course.course_groups.exists?(position: 0)
+        course.course_groups.each_with_index do |group, index|
+          group.update_attributes(position: index+1)
+        end
+      end
+    end
+  end
+end