更新测试集失败

app/controllers/challenges_controller.rb

@@ -173,6 +173,7 @@ class ChallengesController < ApplicationController
 
   # tab 0:过关任务的更新; 1:评测设置的更新; 2:表示参考答案的更新;
   def update
+    begin
       ActiveRecord::Base.transaction do
         tab = params[:tab].to_i
         @challenge.update_attributes(challenge_params)
@@ -231,6 +232,11 @@ class ChallengesController < ApplicationController
         end
 
       end
+    rescue => e
+      logger_error("##update_challenges: ##{e.message}")
+      tip_exception("更新失败！")
+    end
+
   end
 
   # 参考答案的'增,删,改'

db/migrate/20191211073142_modify_type_for_test_sets.rb

@@ -0,0 +1,7 @@
+class ModifyTypeForTestSets < ActiveRecord::Migration[5.2]
+  def change
+    change_column :test_sets, :input, :longtext
+    change_column :test_sets, :output, :longtext
+
+  end
+end