Rails - Best-Practice: How to create dependent has_one relations
与上述问题类似。我有一个记录,我希望有一个(多态关系),但一个"默认"依赖对象不足够吗?我能找到的最接近的是Is it possible to pass params from to a before_create in a model?,但由于它的票数很低而且很笨重,所以我不确定它是"对"溶液
class A < ActiveRecord::Base
has_one :b, :as=>:foo, :dependent=>:destroy
accepts_nested_attributes_for :b
end
class B < ActiveRecord::Base
belongs_to :foo, polymorphic: true
end
答案 0 :(得分:0)
通常,这将从accepts_nested_attribute_for创建,如您所示,假设从表单传递。您可以尝试自定义的验证
validate :check_has_b
def check_has_b
unless b and b.valid?
errors.add(:base, "You must have a valid B ")
end
end