删除多余学生的测验数据

db/migrate/20151215105425_delete_exercise_user.rb

@@ -0,0 +1,9 @@
+class DeleteExerciseUser < ActiveRecord::Migration
+  def up
+    eus=ExerciseUser.where("score is null and status=?",0)
+    eus.delete_all
+  end
+
+  def down
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20151209085942) do
+ActiveRecord::Schema.define(:version => 20151215105425) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false
@@ -1161,7 +1161,6 @@ ActiveRecord::Schema.define(:version => 20151209085942) do
     t.datetime "updated_at",                         :null => false
     t.boolean  "locked",          :default => false
     t.integer  "sticky",          :default => 0
-    t.integer  "org_subfield_id"
   end
 
   create_table "org_member_roles", :force => true do |t|
@@ -1188,7 +1187,6 @@ ActiveRecord::Schema.define(:version => 20151209085942) do
     t.string   "name"
     t.datetime "created_at",      :null => false
     t.datetime "updated_at",      :null => false
-    t.string   "field_type"
   end
 
   create_table "organizations", :force => true do |t|