部分评分数据重复

db/migrate/20150630031857_delete_same_score.rb

@@ -0,0 +1,13 @@
+class DeleteSameScore < ActiveRecord::Migration
+  def up
+    student_work_scores = StudentWorksScore.find_by_sql("SELECT * FROM student_works_scores AS  a
+      WHERE (a.student_work_id,a.user_id) IN  (SELECT student_work_id,user_id FROM student_works_scores GROUP BY student_work_id,user_id HAVING COUNT(*) > 1)
+      AND id NOT IN (SELECT MIN(id) FROM student_works_scores GROUP BY student_work_id,user_id HAVING COUNT(*)>1)")
+    student_work_scores.each do |score|
+      score.destroy
+    end
+  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 => 20150619060110) do
+ActiveRecord::Schema.define(:version => 20150630031857) do
 
   create_table "activities", :force => true do |t|
     t.integer "act_id",   :null => false
@@ -721,16 +721,6 @@ ActiveRecord::Schema.define(:version => 20150619060110) do
 
   add_index "journal_details", ["journal_id"], :name => "journal_details_journal_id"
 
-  create_table "journal_details_copy", :force => true do |t|
-    t.integer "journal_id",               :default => 0,  :null => false
-    t.string  "property",   :limit => 30, :default => "", :null => false
-    t.string  "prop_key",   :limit => 30, :default => "", :null => false
-    t.text    "old_value"
-    t.text    "value"
-  end
-
-  add_index "journal_details_copy", ["journal_id"], :name => "journal_details_journal_id"
-
   create_table "journal_replies", :id => false, :force => true do |t|
     t.integer "journal_id"
     t.integer "user_id"