如何命名多对多关联？ [ActiveRecord]

Question

我有一个名为Purchase的模型和一个名为TicketType的模型。购买可以有许多票据类型，而票据类型可以有许多购买。

所以我

class Purchase < ActiveRecord::Base 
    has_many :purchases_ticket_types, :class_name => 'PurchaseTicketType' 
    has_many :ticket_types, :through => :purchases_ticket_types 
end 

class TicketType < ActiveRecord::Base 
    has_many :purchases_ticket_types, :class_name => 'PurchaseTicketType' 
    has_many :purchases, :through => :purchases_ticket_types 
end 

class PurchaseTicketType < ActiveRecord::Base 
    set_table_name "purchases_ticket_types" 
    belongs_to :purchase 
    belongs_to :ticket_type 
end 

我知道一个表名purchases_ticket_types打算尽快麻烦的ActiveRecord的未能从骆驼套管类名标识正确的表名。我结束了不得不调用set_table_name。

但最糟糕的是不得不这样做：

purchase = Purchase.find(1) 
purchase.purchases_ticket_types.each do |purchase_ticket_type| 
    puts 'join contains quantity: ' + purchase_ticket_type.quantity 
    puts 'ticket type name is: ' + purchase_ticket_type.ticket_type.name 
end 

显得多么冗长和重复的读取。一切正常，但看起来很难看。有没有更好的方式来命名多对多的关联以避免这种事情：purchase.purchases_ticket_types.first.ticket_type.name？

谢谢！

Answer 1

如何使用TicketSale作为联接型号名称（或简称Sale，如果你的应用程序不从门票销售二话不说）：

class Purchase < ActiveRecord::Base 
    has_many :ticket_sales 
    has_many :ticket_types, :through => :ticket_sales 
end 

class TicketType < ActiveRecord::Base 
    has_many :ticket_sales 
    has_many :purchases, :through => :ticket_sales 
end 

class TicketSale < ActiveRecord::Base 
    belongs_to :purchase 
    belongs_to :ticket_type 
end