Rails - Feb 2011 - accept_nested_attributes, reject_if doesn't work.

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?

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

On Fri, Feb 11, 2011 at 9:21 PM, Mauro
<mrsanna1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 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?
>
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