From: niklas | brueckenschlaeger <niklas@...>
Date: 2011-01-05T00:27:45+09:00
Subject: Re: Validates is exists

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Validations should happen in the model, not the controller. You could
use has_many :through, which gives you more control over the join table:

class Event
  has_many :users, :through =3D> :event_users
end

class EventUser
  belongs_to :event
  belongs_to :user
  validates_uniqueness_of :user_id, :scope =3D> :event, :message =3D> "You
can only sign up once for a event"
end

class User
  has_many :events, :through =3D> :event_users
end


On Tue, 2011-01-04 at 03:14 +0900, Jose tomas R. wrote:
> Event has_and_belongs_to_many :users
> User  has_and_belongs_to_many :events
>=20
> Im trying to verify that user doesnt signup more than one time
>=20
>=20
>   def signup
>     @event =3D Event.find(params[:id])
>   @user =3D current_user
>     respond_to do |format|
>       if @event.users.find(@user) !=3D @user.id
>     @user.events << @event
>         format.html { redirect_to(@event, :notice =3D> 'You where
> successfully Signed Up.') }
>         format.xml  { head :ok }
>       else
>         format.html { redirect_to(@event, :notice =3D> 'You where already
> Signed Up.') }
>         format.xml  { head :ok }
>       end
>     end
>   end
>=20
> but i think that's no ok, i get this message, when the user havent
> signed up:
>=20
> Couldn't find User with ID=3D2 [WHERE ("events_users".event_id =3D 7 )]
>=20


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