Initialization using the Singleton design pattern

[Jonathan Leighton]

Hi,

I have a singleton class, as in one that does "include Singleton". I
want to run a few methods when the instance is created. Usually one
would do that in initialize(), but obviously I can't do that here. This
is what I've thought of but it raises an error which says "super: no
superclass method `instance'"

class SingletonClass < ParentClass
include Singleton

def self.instance
super
# initialization code here
end
end

What am I doing wrong?

Cheers

 

[James Edward Gray II]

Hi,

I have a singleton class, as in one that does "include Singleton". I
want to run a few methods when the instance is created. Usually one
would do that in initialize(), but obviously I can't do that here.

Why not? The object is still constructed:
initialize() called
=> #<JustOne:0x32321c>

James Edward Gray II

 

[Austin Ziegler]

I have a singleton class, as in one that does "include Singleton". I
want to run a few methods when the instance is created. Usually one
would do that in initialize(), but obviously I can't do that here. This
is what I've thought of but it raises an error which says "super: no
superclass method `instance'"

Right. Just use #initialize as normal, though.

-austin

 

[Jonathan Leighton]

Why not? The object is still constructed:

initialize() called

=> #<JustOne:0x32321c>

Okay thanks, I've got it sorted now. I had tried using initialize()
previously but I guess I got put off as what I was doing raised an
exception -- so I assumed you weren't supposed to use initialize()
without thinking about it any harder.

Cheers