删除无效动态

db/migrate/20150602055730_remove_bid_activity.rb

@@ -0,0 +1,7 @@
+class RemoveBidActivity < ActiveRecord::Migration
+  def change
+    Activity.where(:act_type => "Bid").each do |act|
+      act.destroy
+    end
+  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 => 20150602021020) do
+ActiveRecord::Schema.define(:version => 20150602055730) do
 
   create_table "activities", :force => true do |t|
     t.integer "act_id",   :null => false