Is ActiveModel::Errors#[]'s behavior correct?

rubyonrails-core
1

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

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

2

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.

3

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!