Skip validation for related objects - rails activerecord

问题

class Author
  has_many :books

  validates :email, :presence => true
end

class Book
  belongs_to :author

  validates :title, :presence => true
end

Skipping validations is easy:

a = Author.new
a.save(:validate => false)

However, I need skip author validations when creating a book without skipping books validations, like this:

b = Book.new
b.title = "A Book"

b.author = Author.last
b.save

回答1:

I quite did not understand your question. In your example you are not creating any new author object:

>     b = Book.new
>     b.title = "A Book"
>     
>     b.author = Author.last
>     b.save

If you are trying to create a new author without an email, can't you just do:

b = Book.new
b.title = "A Book"

author = Author.new
author.save(:validate => false)

b.author = author
b.save

Hmm... maybe I'm just missing something obvious here.

回答2:

Since author validation seems not so important while saving your model, you could write your Book model like this:

class Book
  belongs_to :author, :validate => false

  validates :title, :presence => true
end

This way, authors validations will be skipped while saving.

来源：https://stackoverflow.com/questions/4313748/skip-validation-for-related-objects-rails-activerecord