Singleton classes

ruby-talk
1

I'm trying to implement the singleton design in some classes. According to ruby-doc.org[1] page on singletons, it should be fairly straightforward.

Unfortunately, I'm running into problems. Take the following declaration:

class Config
   require 'yaml'
   include Singleton

   .....
end

When trying to use the class I get:

uninitialized constant Config::Singleton (NameError)

Also, I am not sure how to change from using the initialize method. Normally, the Config class is initialized with a username, and then provides methods to load/save, add/delete config directives.

Any tips on converting this class much apprecited.

Thanks

Matt

2

Matt Harrison wrote:

I'm trying to implement the singleton design in some classes. According to ruby-doc.org[1] page on singletons, it should be fairly straightforward.

Unfortunately, I'm running into problems. Take the following declaration:

class Config
  require 'yaml'
  include Singleton

  .....
end

When trying to use the class I get:

uninitialized constant Config::Singleton (NameError)

Also, I am not sure how to change from using the initialize method. Normally, the Config class is initialized with a username, and then provides methods to load/save, add/delete config directives.

Any tips on converting this class much apprecited.

Thanks

Matt

require 'singleton'

will take care of the first issue. As far as how to pass in arguments to initialize the instance, I played around with it a little but didn't see an obvious way of doing it.

-Justin

3

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4

Justin Collins wrote:

require 'singleton'

will take care of the first issue. As far as how to pass in arguments to initialize the instance, I played around with it a little but didn't see an obvious way of doing it.

-Justin

Excellent, thanks. I think the docs for that class could be a little clearer.

As for the initialize problem, I just moved the code from that method into a normal method. So where in initialize it took a filename and opened the file, I just moved that into a "load" method.

Thanks for the help.

Matt