add_stories_count_to_journals.rb

class AddStoriesCountToJournals < ActiveRecord::Migration
  def self.up
    add_column :journals, :stories_count, :integer
  end

  def self.down
    remove_column :journals, :stories_count
  end
end

add_stories_index_on_user_account_and_journal.rb

class AddStoriesIndexOnUserAccountAndJournal < ActiveRecord::Migration
  def self.up
    add_index :stories, [:user_id, :account_id, :journal_id]
  end

  def self.down
    remove_index :stories, [:user_id, :account_id, :journal_id]
  end
end

create_stories_table.rb

class CreateStoryTable < ActiveRecord::Migration
  def self.up
    create_table :stories do |t|
      t.string  :title
      t.integer :journal_id
      t.integer :user_id
      t.integer :account_id
      t.timestamps
    end
  end

  def self.down
    drop_table :stories
  end
end