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# 001_create_posts.rbclass CreatePosts < ActiveRecord::Migration  def self.up    create_table :posts, :force => true do |t|      t.column :title, :string, :null => false, :limit => 100      t.column :content, :text, :null => false      t.column :date_created, :datetime, :null => false, :default => Time.now      t.column :date_updated, :datetime, :null => false, :default => Time.now    end  end  def self.down    drop_table :posts  endend# 001_create_tags.rbclass CreateTags < ActiveRecord::Migration  def self.up    create_table :posts_tags, :force => true, :id => false do |t|      t.column :post_id, :integer      t.column :tag_id, :integer    end    create_table :tags, :force => true do |t|      t.column :name, :string, :null => false, :limit => 100    end  end  def self.down    drop_table :posts_tags    drop_table :tags  endend