Ruby，合并两个不同的对象

Question

我需要在我的Ruby on Rails应用程序中合并到不同的对象。我有我的发票对象：

class Invoice < ActiveRecord::Base { 
          :id => :integer, 
         :user_id => :integer, 
        :description => :text, 
          ...... 
         :status => :string, 
         :price => :float 
} 

我的支付对象：

class Payment < ActiveRecord::Base { 
      :id => :integer, 
     :token => :string, 
    :invoice_id => :integer, 
    :created_at => :datetime, 
    :updated_at => :datetime, 
     :email => :string 
} 

1处它们之间有很多关系：

class Invoice < ActiveRecord::Base 
    has_many :payments 

class Payment < ActiveRecord::Base 
    belongs_to :invoice 

现在我想要做的是返回关联的付款对象的发票对象和：电子邮件和：created_at字段。现在我回到这两个对象与ZIP功能：

:invoices => (user.invoices.where(:hide => false).zip user.invoices.map{|x| x.payments.last}), 

但返回数组的数组：

[ 
    [{invoice},{payment}], 
    [{invoice},{payment}], 
    ... 
] 

我想回是一样的东西：

[ 
    {invoice, :email_payment, :created_at_payment}, 
    {invoice_1, :email_payment, :created_at_payment}, 
    ... 
] 

我怎样才能做到这一点？

Answer 1

我想补充email_payment和created_at_payment为方法，以发票的模式，但你可以用下面的实现它：

user.invoices.where(hide: false).map do |invoice| 
    invoice.attributes.merge({ 
    email_payment: invoice.payments.last.email, 
    created_at_payment: invoice.payments.last.created_at 
    }) 
end