diff --git a/db/migrate/20190530055732_add_evaluate_count_to_shixuns.rb b/db/migrate/20190530055732_add_evaluate_count_to_shixuns.rb
index 9389afd0..7bd6dcd1 100644
--- a/db/migrate/20190530055732_add_evaluate_count_to_shixuns.rb
+++ b/db/migrate/20190530055732_add_evaluate_count_to_shixuns.rb
@@ -2,20 +2,20 @@ class AddEvaluateCountToShixuns < ActiveRecord::Migration
   def up
     add_column :shixuns, :evaluate_count, :integer, default: 0
 
-    limit = 100
-    total = Shixun.count
-
-    ((total / 100) + 1).times do |index|
-      shixun_ids = Shixun.order(:id).limit(limit).offset(index * limit).pluck(:id)
-      return if shixun_ids.blank?
-
-      count_map = Game.joins(:challenge).where(challenges: { shixun_id: shixun_ids }).group('shixun_id').sum(:evaluate_count)
-
-      id_str = count_map.keys.join(',')
-      str = count_map.map { |shixun_id, count| "WHEN #{shixun_id} THEN #{count}" }.join(' ')
-
-      execute "UPDATE shixuns SET evaluate_count = CASE id #{str} END WHERE id IN (#{id_str})"
-    end
+    # limit = 100
+    # total = Shixun.count
+    #
+    # ((total / 100) + 1).times do |index|
+    #   shixun_ids = Shixun.order(:id).limit(limit).offset(index * limit).pluck(:id)
+    #   return if shixun_ids.blank?
+    #
+    #   count_map = Game.joins(:challenge).where(challenges: { shixun_id: shixun_ids }).group('shixun_id').sum(:evaluate_count)
+    #
+    #   id_str = count_map.keys.join(',')
+    #   str = count_map.map { |shixun_id, count| "WHEN #{shixun_id} THEN #{count}" }.join(' ')
+    #
+    #   execute "UPDATE shixuns SET evaluate_count = CASE id #{str} END WHERE id IN (#{id_str})"
+    # end
   end
 
   def down