如何在Ruby / Rails中抽象与父类相似的验证/关系？

问题描述

| 我有这些非常相似的课程：

class DeliveryDocument < CommercialDocument
  # Relations
  belongs_to :biller,:class_name => \'Company\'
  belongs_to :customer,:class_name => \'Company\'
  belongs_to :customer_center,:class_name => \'Center\'
  has_many :delivery_document_lines,:dependent => :destroy
  alias_attribute :lines,:delivery_document_lines
  # Some configuration
  accepts_nested_attributes_for :delivery_document_lines
  acts_as_freezable :only_dependencies => true,:has_many => [:delivery_document_lines],:belongs_to => [:biller,:customer,:customer_center]
  acts_as_clonable :has_many => [:delivery_document_lines]
  validates_each :lines do |record,attr,value|
    # ...
  end
end

和：

class InvoiceDocument < CommercialDocument
  self.
  # Relations
  belongs_to :biller,:class_name => \'Center\'
  has_many :invoice_document_lines,:invoice_document_lines
  # Some configuration
  accepts_nested_attributes_for :invoice_document_lines
  acts_as_freezable :only_dependencies => true,:has_many => [:invoice_document_lines],:customer_center]
  acts_as_clonable :has_many => [:invoice_document_lines]
  # Validations
  validates_each :lines do |record,value|
    # ...
  end
end

我也有一些我没有粘贴的方法可以提取到父级。我只需要知道父类中的类名即可。当我这样做时：

class CommercialDocument < Document  # document inherits from AR::Base
  # ...
  has_many :\"#{self.to_s.underscore}_lines\",:dependent => :destroy
  # ...
  accepts_nested_attributes_for :\"#{self.to_s.underscore}_lines\"
  # ...
end

它不起作用，因为

self.to_s

是

CommercialDocument

。 您将如何在父类中重构此行为？ 我可以将内容放入模块中并导入，但是整个文档层次几乎变得毫无用处。 我已经有了文档的层次结构，所以如果可以的话，我想在有办法的情况下使用它。     

解决方法

        您可以尝试使用Class.inherited