It's a stub of sorts. When you use "validate :some_symbol" in your model, it's basically adding that symbol to a stack that it's going to invoke "model_instance.send(:some_symbol)" (more or less) on when validation happens.
On Jan 22, 10:28 am, Hiro Protagonist <[email protected]> wrote: > IN NEED OF EXPLANATION: > > class Comment < ActiveRecord::Base > validate :must_be_friends > > def must_be_friends > errors.add_to_base("Must be friends to leave a comment") > unless commenter.friend_of?(commentee) > end > end > > The above code comes from rails documentation. There is a similar > example inAgile Web Development with Rails by Dave Thomas and Sam Ruby. > > my understanding is that: > validate :must_be_friends > is a method call to the validate method within the ActiveRecord::Base > class. Supposedly it's contents are: > def validate > end > > This of course does not work with ruby because the validate method does > not take parameters. > > Is metaporgramming being used? Tnis seems like some sort of Rails > idiom. > > Please explain. > > I'm trying to get back into Rails after my first attempt. > > TIA, > Pete > -- > Posted viahttp://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
