accept_nested_attributes, reject_if doesn't work.

rubyonrails-talk
1

class Post < ActiveRecord::Base   validates :name, :presence => true   validates :title, :presence => true,             :length => { :minimum => 5 }   has_many :comments, :dependent => :destroy   has_many :tags

  accepts_nested_attributes_for :tags, :allow_destroy => :true,     :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? or v.nil? } } end

rails c

irb(main):001:0> post=Post.first => #<Post id: 1, name: "prova", title: "titolo prova", content: "prova 1", created_at: "2011-02-01 10:03:10", updated_at: "2011-02-01 10:03:10">

irb(main):002:0> post.tags.create() => #<Tag id: 5, name: nil, post_id: 1, created_at: "2011-02-11 13:19:22", updated_at: "2011-02-11 13:19:22"> irb(main):003:0>

irb(main):003:0> post.valid? => true

Tags has blank or nil attributes but it is saved. Why I have put :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? or v.nil? } } for tags?

2

Looking at http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html

I think accepts_nested_attributes expects an #{association}_attributes key/value pair to be passed

as an attribute to the parent object, in this case Post.

doing post.tags.create doesn’t pass by accepts_nested_attributes_for but the normal Tag.create.