ruby-on-rails - 将验证上下文传递给关联模型

Question

我使用上下文在模型生命周期的不同点调用特定验证:

model Address
    validates :city, presence: true
    validates :street, presence: true, on: :send_letter
end

incomplete_address = Address.new(city: 'Berlin')
incomplete_address.valid? # => true
incomplete_address.valid?(:send_letter) # => false

这适用于上面的简单情况。但是，据我所知，任何关联对象的上下文都被忽略了:

model Address
    belongs_to :country
    validates :street, presence: true, on: :send_letter
    validates_associated :country
end

model Country
    has_many :addresses
    validates :iso_alpha_3, presence: true, size: 3, on: :send_letter
end

incomplete_address = Address.new(street: 'Oranienstr', country: Country.new(name: 'Germany', iso_alpha_3: 'Invalid iso code')

incomplete_address.valid? # => true
incomplete_address.valid?(:send_letter) # => true
incomplete_address.country.valid?(:send_letter) => false

问题:这是预期的行为，还是我遇到的错误？还是我犯了概念性错误？在这种情况下验证关联模型的最优雅方法是什么？

Answer 1

我知道这个问题已有 3 年历史，但现在有一条稍微容易一些的路径，而且即将出现一个更容易的选择。

目前有an outstanding PR通过 validates_associated 调用上的配置选项添加此功能。同时，您可以将该版本的 AssociatedValidator 添加为单独的验证器(例如 AssociatedPreservingContextValidator)并在 `Address 中调用 validate_with AssociatedPreservingContextValidator, :country .