修改进入某个班级报错的BUG

app/api/mobile/entities/course.rb

@@ -57,14 +57,21 @@ module Mobile
       expose :can_setting, if: lambda { |instance, options| options[:user] } do |instance, options|
         current_user = options[:user]
         can_setting = false
-        member = instance.members.where("user_id=#{current_user.id} and course_id=#{instance.id}")[0]
+
+        if instance[:course]
+          course = instance[:course]
+        else
+          course = instance
+        end
+
+        member = course.members.where("user_id=#{current_user.id} and course_id=#{course.id}")[0]
         roleName = member.roles[0].name if member
 
         if roleName && (roleName == "TeachingAsistant" || roleName == "Teacher" )
           can_setting = true
         end
 
-        if instance.tea_id == current_user.id
+        if course.tea_id == current_user.id
           can_setting = true
         end
         can_setting