add pixiv id search

db/migrate/20130331182719_add_pixiv_id_to_posts.rb

@@ -0,0 +1,12 @@
+class AddPixivIdToPosts < ActiveRecord::Migration
+  def up
+    execute "set statement_timeout = 0"
+    add_column :posts, :pixiv_id, :integer
+    execute "create index index_posts_on_pixiv_id on posts (pixiv_id) where pixiv_id is not null"
+  end
+  
+  def down
+    execute "set statement_timeout = 0"
+    remove_column :posts, :pixiv_id
+  end
+end