Rails core - May 2011 - Is ActiveModel::Errors#'s behavior correct?

Hi all

I used rails 3.0.7 and found ActiveRecord::Errors#[] acts little bit
strange (at least for me).
Let''s say we have a model like below.

  class User < ActiveRecord::Base
    validates :name, :presence => true
  end

  irb> u = User.new
  irb> u.valid?
  irb> u.errors #=> { :name => ["can not be nil"] }
  irb> u.errors[:age] # => []
  irb> u.errors #=> { :name => ["can not be nil"], :age =>
[] }

Thought ActiveRecord::Errors#[] looks like just an getter, it actually
rewrites itself.
Is this a correct behavior?

Regards
    Shouichi

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> Thought ActiveRecord::Errors#[] looks like just an getter, it actually
> rewrites itself.
> Is this a correct behavior?
While it''s a little strange the semantics are that it returns an array
which is empty if there''s no error.  The implementation is something
like this:

ree-1.8.7-2011.03 :003 > h = Hash.new {|h, k| h[k] = []}
 => {}
ree-1.8.7-2011.03 :004 > h[:huh]
 => []
ree-1.8.7-2011.03 :005 > h
 => {:huh=>[]}

Which is why you see what you see.


-- 
Cheers

Koz

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> ree-1.8.7-2011.03 :003 > h = Hash.new {|h, k| h[k] = []}
> => {}
> ree-1.8.7-2011.03 :004 > h[:huh]
> => []
> ree-1.8.7-2011.03 :005 > h
> => {:huh=>[]}
I see. It''s the behavior of ruby hash and I can''t argue with
that.

Thanks!

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