Pretty quick example, imagine we have two classes, a user and a post.
class Post < ActiveRecord::Base
belongs_to :user
validates_presence_of :user_id
end
This basically just ensures that no post is created without a user id.
However if I do something like this (assuming a User has_many :posts)
user.posts << Post.new({ :subject = "post subject" })
user.save
Then I get an error saying "Posts is invalid." Take out the
validates_presence_of :user_id and it works fine.
Should I not be validating the presence of foreign keys like this?
What''s the best way to ensure that a fkey is set up - or is there even
any reason to? I have constraints set up in my DB, but I was
wondering if I should/need to make a check in Rails. Am I good to go
as long as I set relations properly, i.e. user.posts << Post.new....
post.user = thisuser, etc, rather than accessing the id directly.
Thanks,
Pat
On 12/1/05, Pat Maddox <pergesu@gmail.com> wrote:> Pretty quick example, imagine we have two classes, a user and a post. > class Post < ActiveRecord::Base > belongs_to :user > validates_presence_of :user_id > end > > This basically just ensures that no post is created without a user id. > However if I do something like this (assuming a User has_many :posts) > user.posts << Post.new({ :subject = "post subject" }) > user.save > > Then I get an error saying "Posts is invalid." Take out the > validates_presence_of :user_id and it works fine. > > Should I not be validating the presence of foreign keys like this? > What's the best way to ensure that a fkey is set up - or is there even > any reason to? I have constraints set up in my DB, but I was > wondering if I should/need to make a check in Rails. Am I good to go > as long as I set relations properly, i.e. user.posts << Post.new.... > post.user = thisuser, etc, rather than accessing the id directly.Do you get the same negative results when using user.posts.create() or user.posts.build()? I'm not sure if your example is supposed to work since I find the API docs a bit ambiguous when it comes to what the different methods defined by the has_many macro are supposed to do. Hoping this helps, - Rowan -- Morality is usually taught by the immoral. _______________________________________________ Rails mailing list Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org http://lists.rubyonrails.org/mailman/listinfo/rails
perhaps the problem lies in the definition of your users class. Can you post the code from this class? -steven -- Posted via http://www.ruby-forum.com/.
def User < ActiveRecord::Base has_many :posts end Complex enough? :) Pat On 12/2/05, Steven Hansen <runner-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote:> > perhaps the problem lies in the definition of your users class. Can you > post the code from this class? > > -steven > > > -- > Posted via http://www.ruby-forum.com/. > _______________________________________________ > Rails mailing list > Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org > http://lists.rubyonrails.org/mailman/listinfo/rails >