You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20140920180945_create_doorkeeper_tables.rb
    path of file: ./repos/linuxfr.org/db/migrate
    
    the code of the file until where you have to start completion: class CreateDoorkeeperTables < ActiveRecord::Migration
  def change
    drop_table :access_grants
    drop_table :client_applications

    create_table :oauth_applications do |t|
      t.string  :name,         null: false
      t.string  :uid,          null: false
      t.string  :secret,       
    
  def change
    drop_table :access_grants
    drop_table :client_applications

    create_table :oauth_applications do |t|
      t.string  :name,         null: false
      t.string  :uid,          null: false
      t.string  :secret,       null: false
      t.text    :redirect_uri, null: false
      t.integer :owner_id,     null: true
      t.string  :owner_type,   null: true
      t.timestamps
    end

    add_index :oauth_applications, :uid, unique: true
    add_index :oauth_applications, [:owner_id, :owner_type]

    create_table :oauth_access_grants do |t|
      t.integer  :resource_owner_id, null: false
      t.integer  :application_id,    null: false
      t.string   :token,             null: false
      t.integer  :expires_in,        null: false
      t.text     :redirect_uri,      null: false
      t.datetime :created_at,        null: false
      t.datetime :revoked_at
      t.string   :scopes
    end

    add_index :oauth_access_grants, :token, unique: true

    create_table :oauth_access_tokens do |t|
      t.integer  :resource_owner_id
      t.integer  :application_id
      t.string   :token,             null: false
      t.string   :refresh_token
      t.integer  :expires_in
      t.datetime :revoked_at
      t.datetime :created_at,        null: false
      t.string   :scopes
    end

    add_index :oauth_access_tokens, :token, unique: true
    add_index :oauth_access_tokens, :resource_owner_id
    add_index :oauth_access_tokens, :refresh_token, unique: true
  end