integrate tags plugins

db/migrate/20111101222453_acts_as_taggable_on_migration.rb

@@ -0,0 +1,28 @@
+class ActsAsTaggableOnMigration < ActiveRecord::Migration
+  def self.up
+    create_table :tags do |t|
+      t.string :name
+    end
+
+    create_table :taggings do |t|
+      t.references :tag
+
+      # You should make sure that the column created is
+      # long enough to store the required class names.
+      t.references :taggable, :polymorphic => true
+      t.references :tagger, :polymorphic => true
+
+      t.string :context
+
+      t.datetime :created_at
+    end
+
+    add_index :taggings, :tag_id
+    add_index :taggings, [:taggable_id, :taggable_type, :context]
+  end
+
+  def self.down
+    drop_table :taggings
+    drop_table :tags
+  end
+end