```ruby
# == Schema Information
#
# Table name: users
#
#  id                     :integer          not null, primary key
#  email                  :string(64)       not null
#  encrypted_password     :string(64)       not null
#  created_at             :datetime         not null
#  updated_at             :datetime         not null
#  sign_in_count          :integer          default(0), not null
#  current_sign_in_at     :datetime
#  last_sign_in_at        :datetime
#  current_sign_in_ip     :inet
#  last_sign_in_ip        :inet
#  failed_attempts        :integer          default(0), not null
#  unlock_token           :string
#  locked_at              :datetime
#  remember_created_at    :datetime
#  reset_password_token   :string
#  reset_password_sent_at :datetime
#

class User < ActiveRecord::Base
  include Gravtastic

  devise :database_authenticatable,
         :lockable,
         :recoverable,
         :rememberable,
         :timeoutable,
         :trackable,
         :validatable,
         :zxcvbnable

  gravtastic default: 'mm', size: 40

  has_and_belongs_to_many :sites, -> { order :name }

  has_paper_trail

  strip_attributes only: :email, collapse_spaces: true

  validates :email, length: { maximum: 64 }, email_format: true
end
```

Order User Sites by host
user
```ruby
# == Schema Information
#
# Table name: users
#
#  id                     :integer          not null, primary key
#  email                  :string(64)       not null
#  encrypted_password     :string(64)       not null
#  created_at             :datetime         not null
#  updated_at             :datetime         not null
#  sign_in_count          :integer          default(0), not null
#  current_sign_in_at     :datetime
#  last_sign_in_at        :datetime
#  current_sign_in_ip     :inet
#  last_sign_in_ip        :inet
#  failed_attempts        :integer          default(0), not null
#  unlock_token           :string
#  locked_at              :datetime
#  remember_created_at    :datetime
#  reset_password_token   :string
#  reset_password_sent_at :datetime
#

class User < ActiveRecord::Base
  include Gravtastic

  devise :database_authenticatable,
         :lockable,
         :recoverable,
         :rememberable,
         :timeoutable,
         :trackable,
         :validatable,
         :zxcvbnable

  gravtastic default: 'mm', size: 40

  has_and_belongs_to_many :sites, -> { order :host }

  has_paper_trail

  strip_attributes only: :email, collapse_spaces: true

  validates :email, length: { maximum: 64 }, email_format: true
end
```
assistant