map is defined in the Enumerable module. A has_many association will
return a HasManyAssociation proxy which is a subclass of
AssociationCollection. It is possible that AssociationCollection mixes
in Enumerable, but I can't find it right now.
However, it looks like you are calling map on a User model. Does your
code look like this?
class Group < AR::Base
has_many :users
end
Regards,
kamal
On Jan 14, 2008, at 9:13 PM, Booking Heaven wrote:
> Yes Sir, You're Right, I did set it to has_many before i posted the
> first message. It said : NoMethodError: undefined method 'map' for
> #<User:0x47d4d18>
>
> Even when I try to another way using belongs_to not from your script
> but the same outline with your mind and says error like the first.
>
> What is "map" must be implemented to has_many? I think it works in
> any Relational Object or Table. I dont know how your script is
> working well in your Notebook.
>
>
>
> Rie! <[EMAIL PROTECTED]>
> wrote: On 14/01/2008, Booking Heaven <[EMAIL
> PROTECTED]
> > wrote:
>
>> NOT work at me, i did same things like you. And at
>> Group.find(:all).map { |g| g.users.map(&:email) }
>> it says :
>> NoMethodError: undefined method 'map' for #<User:0x47d4d18>
>>
>> I am using Rails 1.2.3 & Ruby 1.8.5 & OS XP.
>
> make sure you've got the same AR structures (has_many :through or you
> can play it with has_many, too) as mine.
>
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Regards,
Kamal
