* fix validation

web/app/controllers/api_teachers_controller.rb

@@ -42,13 +42,9 @@ class ApiTeachersController < ApiController
 
 private
   def auth_teacher
-    if current_user.admin
-      @teacher = Teacher.find(params[:id])
-    else
-      @teacher = Teacher.where("user_id=? AND id=?", current_user.id, params[:id]).first
-    end
-    
-    unless @teacher
+    @teacher = Teacher.find(params[:id])
+
+    if !current_user.admin && !@teacher.user == current_user
       Rails.logger.info("Could not find teacher #{params[:id]} for #{current_user}")
       raise JamPermissionError, ValidationMessages::PERMISSION_VALIDATION_ERROR
     end