在 Rails 中，如何验证属于另一个 model 的 model 上的属性？

Question

I have a book_review model which belongs_to a book model.我有一本 book_review model，它属于一本书 model。

I need to validate that the book that the book_review belongs to has a model called author that is not empty, ie book_review belongs_to book, book.author is not empty我需要验证 book_review 所属的书有一个名为 author 的 model 不为空，即 book_review belongs_to book, book.author 不为空

How can I accomplish this?我怎样才能做到这一点？

Answer 1

You have several choices.你有几个选择。 Here are just a few:这里仅仅是少数：

delegate :author, to: :book
validates_presence_of :author

validate :book_has_author

private

def book_has_author
  book.author.present?
end

belongs_to :author, through: :book
validates_presence_of :author

在 Rails 中，如何验证属于另一个 model 的 model 上的属性？

问题描述

1 个解决方案

解决方案1
0 2020-06-23 22:33:02

在 Rails 中，如何验证属于另一个 model 的 model 上的属性？

问题描述

1 个解决方案

解决方案1 0 2020-06-23 22:33:02

解决方案1
0 2020-06-23 22:33:02