diff --git a/app/controllers/attendances_controller.rb b/app/controllers/attendances_controller.rb
index c8287f413..985052f18 100644
--- a/app/controllers/attendances_controller.rb
+++ b/app/controllers/attendances_controller.rb
@@ -2,6 +2,7 @@ class AttendancesController < ApplicationController
 
   before_action :require_login
   before_action :find_course, only: [:index, :statistics]
+  before_action :find_attendance, except: [:index, :statistics]
   before_action :user_course_identity
 
   def index
@@ -66,9 +67,23 @@ class AttendancesController < ApplicationController
     @avg_leave_rate = data[:avg_leave_rate]
   end
 
+  def edit
+    @groups = @course.course_groups.where(id: @attendance.course_attendance_groups.pluck(:course_group_id))
+  end
+
+  def update
+    tip_exception(403, "") unless @user_course_identity < Course::PROFESSOR || @attendance.user_id == current_user.id
+    @attendance.update!(update_params)
+    render_ok
+  end
+
   private
   def find_attendance
     @attendance = CourseAttendance.find params[:id]
     @course = @attendance.course
   end
+
+  def update_params
+    params.permit(:name, :mode, :attendance_date, :start_time, :end_time)
+  end
 end
\ No newline at end of file
diff --git a/app/views/attendances/edit.json.jbuilder b/app/views/attendances/edit.json.jbuilder
new file mode 100644
index 000000000..77d2b09f3
--- /dev/null
+++ b/app/views/attendances/edit.json.jbuilder
@@ -0,0 +1,4 @@
+json.(@attendance, :name, :mode, :attendance_date, :start_time, :end_time)
+json.groups @groups do |group|
+  json.(group, :id, :name)
+end
\ No newline at end of file