Rails - Jul 2008 - Problem with ActiveRecord::AssociationTypeMismatch

Hi all !
I''ve written a Character model, each character has many Attributes. My
schema.rb looks like this:

create_table "characters", :force => true do |t|
  t.string   "first_name"
  t.string   "last_name"
  t.integer  "user_id"
  t.datetime "created_at"
  t.datetime "updated_at"
end

create_table "attributes", :force => true do |t|
  t.string   "name"
  t.float    "value"
  t.integer  "character_id"
  t.datetime "created_at"
  t.datetime "updated_at"
end

And the models look like this:
class Character < ActiveRecord::Base
  has_many :attributes
  ...
end

class Attribute < ActiveRecord::Base
  belongs_to :character
end

When I want to create a new instance by calling
c = Character.new :first_name => "hello", :last_name =>
"world"
I get this Error:
ActiveRecord::AssociationTypeMismatch: Attribute(#17724630) expected,
got Array(#104100)
	from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/
associations/association_proxy.rb:214:in `raise_on_type_mismatch''
	from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/
associations/association_collection.rb:229:in `replace''
	from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/
associations/association_collection.rb:229:in `each''
	from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/
associations/association_collection.rb:229:in `replace''
	from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/
associations.rb:1149:in `attributes=''
	from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/
base.rb:2130:in `initialize''
	from (irb):1:in `new''
	from (irb):1
	from :0

I have no idea why I get this error, since I don''t specify the
"attributes" key. I hope you can help me, thank you very much in
advance.

Greetings,
Christoph
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On 13 Jul 2008, at 19:27, Christoph wrote:
>
> Hi all !
> I''ve written a Character model, each character has many
Attributes. My
> schema.rb looks like this:
>
> create_table "characters", :force => true do |t|
>  t.string   "first_name"
>  t.string   "last_name"
>  t.integer  "user_id"
>  t.datetime "created_at"
>  t.datetime "updated_at"
> end
>
> create_table "attributes", :force => true do |t|
>  t.string   "name"
>  t.float    "value"
>  t.integer  "character_id"
>  t.datetime "created_at"
>  t.datetime "updated_at"
> end
>
> And the models look like this:
> class Character < ActiveRecord::Base
>  has_many :attributes
Don''t do this. You''ll overwrite the existing attributes and  
attributes= methods. Bad stuff will happen.

Fred
>
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Oh my god, I didn''t know that "attributes" has a special
meaning.
Thank you very much,

Christoph

On 13 Jul., 21:05, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 13 Jul 2008, at 19:27, Christoph wrote:
>
>
>
>
>
> > Hi all !
> > I''ve written a Character model, each character has many
Attributes. My
> > schema.rb looks like this:
>
> > create_table "characters", :force => true do |t|
> >  t.string   "first_name"
> >  t.string   "last_name"
> >  t.integer  "user_id"
> >  t.datetime "created_at"
> >  t.datetime "updated_at"
> > end
>
> > create_table "attributes", :force => true do |t|
> >  t.string   "name"
> >  t.float    "value"
> >  t.integer  "character_id"
> >  t.datetime "created_at"
> >  t.datetime "updated_at"
> > end
>
> > And the models look like this:
> > class Character < ActiveRecord::Base
> >  has_many :attributes
>
> Don''t do this. You''ll overwrite the existing attributes
and  
> attributes= methods. Bad stuff will happen.
>
> Fred
>
>
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