关卡评测设置的学院文件路径太长后报错

db/migrate/20190815085136_modify_path_for_challenges.rb

@@ -0,0 +1,5 @@
+class ModifyPathForChallenges < ActiveRecord::Migration[5.2]
+  def change
+    change_column :challenges, :path, :text
+  end
+end