class Company < ActiveRecord::Base attr_protected :rating set_sequence_name :companies_nonstd_seq validates_presence_of :name end class Firm < Company has_many :clients, :order => "id", :dependent => true, :counter_sql => "SELECT COUNT(*) FROM companies WHERE firm_id = 1 AND (type = 'Client' OR type = 'SpecialClient' OR type = 'VerySpecialClient' )" has_many :clients_sorted_desc, :class_name => "Client", :order => "id DESC" has_many :clients_of_firm, :foreign_key => "client_of", :class_name => "Client", :order => "id" has_many :dependent_clients_of_firm, :foreign_key => "client_of", :class_name => "Client", :order => "id", :dependent => true has_many :exclusively_dependent_clients_of_firm, :foreign_key => "client_of", :class_name => "Client", :order => "id", :exclusively_dependent => true has_many :clients_like_ms, :conditions => "name = 'Microsoft'", :class_name => "Client", :order => "id" has_many :clients_using_sql, :class_name => "Client", :finder_sql => 'SELECT * FROM companies WHERE client_of = #{id}' has_many :clients_using_counter_sql, :class_name => "Client", :finder_sql => 'SELECT * FROM companies WHERE client_of = #{id}', :counter_sql => 'SELECT COUNT(*) FROM companies WHERE client_of = #{id}' has_many :clients_using_zero_counter_sql, :class_name => "Client", :finder_sql => 'SELECT * FROM companies WHERE client_of = #{id}', :counter_sql => 'SELECT 0 FROM companies WHERE client_of = #{id}' has_many :no_clients_using_counter_sql, :class_name => "Client", :finder_sql => 'SELECT * FROM companies WHERE client_of = 1000', :counter_sql => 'SELECT COUNT(*) FROM companies WHERE client_of = 1000' has_one :account, :foreign_key => "firm_id", :dependent => true end class DependentFirm < Company has_one :account, :foreign_key => "firm_id", :dependent => :nullify has_many :companies, :foreign_key => 'client_of', :order => "id", :dependent => :nullify end class Client < Company belongs_to :firm, :foreign_key => "client_of" belongs_to :firm_with_basic_id, :class_name => "Firm", :foreign_key => "firm_id" belongs_to :firm_with_other_name, :class_name => "Firm", :foreign_key => "client_of" belongs_to :firm_with_condition, :class_name => "Firm", :foreign_key => "client_of", :conditions => "1 = 1" # Record destruction so we can test whether firm.clients.clear has # is calling client.destroy, deleting from the database, or setting # foreign keys to NULL. def self.destroyed_client_ids @destroyed_client_ids ||= Hash.new { |h,k| h[k] = [] } end before_destroy do |client| if client.firm Client.destroyed_client_ids[client.firm.id] << client.id end true end end class SpecialClient < Client end class VerySpecialClient < SpecialClient end class Account < ActiveRecord::Base belongs_to :firm protected def validate errors.add_on_empty "credit_limit" end end