Awesome!
Thanks Fred and Xuan. I was able to really clean up my code once I
understood this.
One side question based on this. Is there some normal ruby coding
guidelines? I was thinking I would want to make class level functions
capital, and instance level functions lowercase.
User.Authenticate
user.hash_password
I'll keep looking. Thanks everyone again.
Joe
On Sep 6, 10:01 am, Xuan <xua...@gmail.com> wrote:
> On 6 sep, 08:00, pipplo <joe.kos...@gmail.com> wrote:
>
>
>
>
>
> > Hi Guys,
>
> > I'm experimenting with my first rails app currently. One thing I'm
> > trying to implement is a login system.
>
> > I created a model for user.rb I've added a couple of functions to the
> > class for example:
>
> > def self.authenticate(user_info)
> > find_by_username_and_password(....,
> > self.hashed_password(user_info[:password]))
> > end
>
> > def self.hashed_password(password)
> > Digest::SHA2.hexdigest(password)
> > end
>
> > So from user.rb function self.authenticate I can call
> > self.hashed_password and it works fine.
>
> > From another file (user_controller.rb) I try to create a new user
> > based on the authentication parameters, and then call authenticate on
> > that user. In order to do that I have to call
> > user_into.class.authenticate instead of user_info.authenticate...
>
> > I don't understand what is going on here with def self.{function} and
> > the .class modifier.
>
> > Can someone point to me somewhere to explain? I have a feeling I'm
> > doing something wrong but I don't understand what.
>
> > Thanks
>
> Hi pipplo,
>
> When you define a "def self.function" method in yor User class, you
> define a "class level" method.
> When you define a "def function" method, you define an "instance level
> method".
>
> Class and instance level define from where you can call a method:
> If its class level you need a class and thats why you call it as
> "User.authenticate". Given an object it needs a .class after it to
> obtain its class.
> On the other hand instance level means your method is callable from an
> object, so you call it as "my_user.name". Also, since you need a
> particular object of a class, you can't call "User.name".
>
> "self" references to the object that called the method:
> If you use self when defining a method, self references to the class
> you are defining it for.
> If you use self into a method's code defined at class level ( def
> self.method), again it references to the class (a class is also an
> object itself).
> If you use self into a method's code defined at instance level, it
> references to the particular object that called the method. For
> instance: if you call "my_user.method", "self" inside "method" would
> reference "my_user".
--
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 rubyonrails-t...@googlegroups.com.
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.
