account.rb

class Account < ActiveRecord::Base
  self.table_name = 'accounts'

  belongs_to :user,           class_name: 'User', foreign_key: 'user_id'
  belongs_to :type,           class_name: '::Dictionaries::AccountType'

  has_one    :client,         class_name: '::Accounts::Client'
  has_one    :central_agent,  class_name: '::Accounts::CentralAgent'
  has_one    :admin,          class_name: '::Accounts::Admin'
  has_one    :moderator,      class_name: '::Accounts::Moderator'
  has_one    :manager,        class_name: '::Accounts::Manager'
  has_one    :manager_guest,  class_name: '::Accounts::ManagerGuest'

  scope      :clients,         -> { where(type_id: ::Dictionaries::AccountType::CLIENT).where(active: 1) }
  scope      :central_agents,  -> { where(type_id: ::Dictionaries::AccountType::CENTRAL_AGENT).where(active: 1) }
  scope      :admins,          -> { where(type_id: ::Dictionaries::AccountType::ADMIN).where(active: 1) }
  scope      :moderators,      -> { where(type_id: ::Dictionaries::AccountType::MODERATOR).where(active: 1) }
  scope      :managers,        -> { where(type_id: ::Dictionaries::AccountType::MANAGER).where(active: 1) }
  scope      :managers_guests, -> { where(type_id: ::Dictionaries::AccountType::MANAGER_GUEST).where(active: 1) }

  def client?
    type_id == ::Dictionaries::AccountType::CLIENT
  end

  def central_agent?
    type_id == ::Dictionaries::AccountType::CENTRAL_AGENT
  end

  def admin?
    type_id == ::Dictionaries::AccountType::ADMIN
  end

  def moderator?
    type_id == ::Dictionaries::AccountType::MODERATOR
  end

  def manager?
    type_id == ::Dictionaries::AccountType::MANAGER
  end

  def manager_guest?
    type_id == ::Dictionaries::AccountType::MANAGER_GUEST
  end
end

central_agent.rb

module Accounts
  class CentralAgent < ActiveRecord::Base
    self.table_name  = 'accounts_central_agents'
    self.primary_key = 'account_id'

    belongs_to :account, class_name: '::Account', foreign_key: 'account_id'       # Родительская запись
    has_many   :bids,    class_name: '::Lease::Bid', foreign_key: 'account_id'    # Предложения на аренду лодки, сделанные с этого аккаунта
  end
end