OmniAuth migration devise_create_users.rb

devise_create_users.rb

class DeviseCreateUsers < ActiveRecord::Migration
  def change
    create_table(:users) do |t|
      ## Your your user fields
      t.string :email,              default: ""

      ## OmniAuth-able
      t.string :provider
      t.string :uid

      ## Rememberable
      t.datetime :remember_created_at

      ## Trackable
      t.integer  :sign_in_count, default: 0, null: false
      t.datetime :current_sign_in_at
      t.datetime :last_sign_in_at
      t.string   :current_sign_in_ip
      t.string   :last_sign_in_ip

      t.timestamps
    end

    add_index :users, :email
  end
end