数据库为空的迁移问题

db/migrate/20160224074034_update_one_student_score.rb

@@ -1,5 +1,6 @@
 class UpdateOneStudentScore < ActiveRecord::Migration
   def up
+    begin
       student_work_score = StudentWorksScore.where("user_id = 11688 AND student_work_id = 34414").first
       student_work_score.score = 100
       student_work_score.save
@@ -31,6 +32,9 @@ class UpdateOneStudentScore < ActiveRecord::Migration
         end
         work.save
       end
+    rescue => e
+      logger.error "[Errno::ENOENT] ===> #{e}"
+    end
   end
 
   def down

db/migrate/20160329014316_update_one_student_teacher_score.rb

@@ -1,5 +1,6 @@
 class UpdateOneStudentTeacherScore < ActiveRecord::Migration
   def up
+    begin
       work = StudentWork.find 49774
       score = StudentWorksScore.new
       score.score = 100
@@ -10,6 +11,9 @@ class UpdateOneStudentTeacherScore < ActiveRecord::Migration
         work.teacher_score = score.score
       end
       work.save
+    rescue => e
+      logger.error "[Errno::ENOENT] ===> #{e}"
+    end
   end
 
   def down