foodsoft/db/migrate/011_create_comments.rb

class CreateComments < ActiveRecord::Migration[4.2]
  def self.up
    create_table :comments, :force => true do |t|
      t.column :title, :string, :limit => 50, :default => ""
      t.column :comment, :string, :default => ""
      t.column :created_at, :datetime, :null => false
      t.column :commentable_id, :integer, :default => 0, :null => false
      t.column :commentable_type, :string, :limit => 15,
                                           :default => "", :null => false
      t.column :user_id, :integer, :default => 0, :null => false
    end

    add_index :comments, ["user_id"], :name => "fk_comments_user"
  end

  def self.down
    drop_table :comments
  end
end