Stack Level Too Deep?

[Ryan Lewis]

I have a User class that handles users as structs and adds them to a
hash within the class. Anyways, I was making a Remove functions for it.
Here's my code:

class User < Struct.new(:username, :password)
class <<self
def list_hash
@@list_hash ||= {}
end
def list
list_hash.keys.sort
end
def [](user)
list_hash[user]
end
def []=(user, struct)
list_hash[user] = struct
end

def remove(user)
list_hash.delete(user) ### Works perfectly fine
end
end

def initialize(username, password)
self.username  = username
self.password  = password
self.class[username] = self ### Same as User[username] = self
end

def remove()
self.remove() ### => Stack Level Too Deep.
end
end

Alright throw this code at the bottom to test the remove functions...

User.new "Alpha", "Aye"
User.new "Beta", "Bee"
User.new "Charlie", "Sea"

puts User.list, "" ### => ["Alpha", "Beta", "Charlie"]
User.remove("Beta") ### Beta removed..
puts User.list ### => ["Alpha", "Charlie"]
User["Alpha"].remove ### Stack level too deep >_<
puts "Alpha removed..?"

Now why does it come up with a SystemStackError: stack level too deep on
User["Alpha"].remove?

This problem has kept me up all night O_O

Attachments:
http://www.ruby-forum.com/attachment/1718/user.rb

 

[Sebastian Hungerecker]

=C2=A0 =C2=A0 def remove()
=C2=A0 =C2=A0 =C2=A0 self.remove() ### =3D> Stack Level Too Deep.
=C2=A0 =C2=A0 end

What do you think happens when this method is called?
When remove is called, the above code will execute, which will call remove=
=20
again, which will execute the code again, which will call remove again, whi=
ch=20
will... stack level too deep.

HTH,
Sebastian
=2D-=20
Jabber: (e-mail address removed)
ICQ: 205544826

 

[Ryan Lewis]

What do you think happens when this method is called?
When remove is called, the above code will execute, which will call
remove
again, which will execute the code again, which will call remove again,
which
will... stack level too deep.

HTH,
Sebastian

Yeah, but I've been trying to run the remove under self<<, but you made
me realise i dont even need to do that =p

 

[Ken Bloom]

I have a User class that handles users as structs and adds them to a
hash within the class. Anyways, I was making a Remove functions for it.
Here's my code:

class User < Struct.new(:username, :password)[/QUOTE]
[QUOTE]
def remove()
self.remove() ### => Stack Level Too Deep.
end
end[/QUOTE]

The remove() method just keeps calling itself. I think you wanted
def remove()
self.class.remove(self.username)
end

--Ken

 

[Julian Leviston]

Or maybe super()?

Julian



Learn Ruby on Rails! Check out the FREE VIDS (for a limited time)
VIDEO #3 out NOW!
http://sensei.zenunit.com/

I have a User class that handles users as structs and adds them to a
hash within the class. Anyways, I was making a Remove functions for
it.
Here's my code:

class User < Struct.new(:username, :password)[/QUOTE]
[QUOTE]
def remove()
self.remove() ### => Stack Level Too Deep.
end
end[/QUOTE]

The remove() method just keeps calling itself. I think you wanted
def remove()
self.class.remove(self.username)
end

--Ken
[/QUOTE]

 

[Ryan Lewis]

The remove() method just keeps calling itself. I think you wanted
def remove()
self.class.remove(self.username)
end

--Ken

Ahh thanks alot! That's exactly what I was looking for.

 

[Ryan Lewis]

Here's another question, how would I go about setting the User class to
output the @@user_hash? I know theres a method for that, i just can't
seem to find it.

 

[Ken Bloom]

I have a User class that handles users as structs and adds them to a
hash within the class. Anyways, I was making a Remove functions for
it.
Here's my code:

class User < Struct.new(:username, :password)[/QUOTE]
[QUOTE]
def remove()
self.remove() ### => Stack Level Too Deep.
end
end[/QUOTE]

The remove() method just keeps calling itself. I think you wanted
def remove()
self.class.remove(self.username)
end[/QUOTE]

Or maybe super()?[/QUOTE]

You'll get a NoMethodError if you call super(), because you're not
overriding an existing remove method

--Ken