Out of curiosity, where is the has_many :projects line in user.rb
relative to the after_save?
At first glance, I would guess that the has_many comes later, which is
could cause this problem -
add_to_project_if_invitation is adding a record to projects, which the
code generated by
add_multiple_associated_save_callbacks (in association.rb) is trying
to save again.
--Matt Jones
On Jan 10, 2009, at 11:24 PM, edgarjs wrote:
>
> Hi,
>
> I'm currently building an app that has these models:
>
> class Project < ActiveRecord::Base
> has_many :collabs
> has_many :users, :through => :collabs
> end
>
> class User < ActiveRecord::Base
> has_many :collabs
> has_many :projects, :through => :collabs
> end
>
> # collabs is the "join" model only...
>
> class Invitation < ActiveRecord::Base
> belongs_to :project
> end
>
> Then in my UsersController#new I check if there is an invitation code,
> if so then I pass a hidden field to the form with the invitation code
> so when the user is saved it's added to the project which was invited
> to. I have this on my user model like this:
>
> class User < ActiveRecord::Base
> ...
> attr_accessor :invitation_token
> after_create :add_to_project_by_invitation, :if => lambda { |u| !
> u.invitation_token.blank? }
>
> def add_to_project_by_invitation
> invitation = Invitation.find_by_token(invitation_token)
> projects << invitation.project if invitation && !projects.include?
> (invitation.project)
> end
> end
>
> When I invite a user to the project 1 and he tries to signup with the
> invitation token, then this error raises:
>
> Mysql::Error: Duplicate entry '1-3' for key 2: INSERT INTO `collabs`
> (`created_at`, `project_id`, `updated_at`, `admin`, `user_id`) VALUES
> ('2009-01-11 04:15:13', 1, '2009-01-11 04:15:13', 0, 3)
>
>
> BUT!, when I just change the after_create callback in my User model to
> before_create it goes all sweetie...
>
>
> I'm using Rails 2.2.2
> Could this be a bug?... The full stack is here: http://pastie.org/357749
>
> Regards.
> >
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