Configuring custom library

Hi,

I've added a custom library called lib\AccountSystem like so:

"module AccountSystem   SINGLE = 1   MULTIPLE = 2

  class << self      attr_accessor :account_system_type   end end"

Now I wanna configure AccountSystem.account_system_type=AccountSystem::SINGLE in one app. I used an initializer: config/initializers/account_initialization.rb where I put this line in.

I included my AccountSystem in the ApplicationController.

So now I'd like to check within my controllers the value of AccountSystem.account_system_type

But there it is empty! However if I run "Ruby script\console" and type AccountSystem.account_system_type I get the value of 1 as I would expect.

How can I achieve the same result within my controllers?

I'm on rails 2.1.0/2.1.1

Thanks

Hi,

I've added a custom library called lib\AccountSystem like so:

"module AccountSystem SINGLE = 1 MULTIPLE = 2

class << self     attr_accessor :account_system_type end end"

Now I wanna configure AccountSystem.account_system_type=AccountSystem::SINGLE in one app. I used an initializer: config/initializers/account_initialization.rb where I put this line in.

Did you restart your app after you added this ?

Fred

if you are checking AccountSystem.account_system_type in your controller what is the point of including it in ApplicationController? If you plan to use it as such, maybe you are better off making it a Singleton Class.

If you actually want account_system_type to be a class accessor on ApplicationController you must do something like this:

Module AccountSystem   SINGLE = 1   MULTIPLE = 2

  self.included(klass)     klass.send(:cattr_accessor, :account_system_id)   end end

class ApplicationController < ActionController::Base   include AccountSystem

  # this is how you would use it   def random_method     self.class.account_system_id == AccountSystem::SINGLE   end end

That should do what you seem to want, but if your goal was something different let me know and I can try to help.

Of note, if you do use the above solution you could do:

Module AccountSystem   ...

  def single?     self.class.account_system_id == SINGLE   end

  def multiple?     self.class.account_system_id == MULTIPLE   end

  ... end

class ApplicationController < ActionController::Base   include AccountSystem

  # this is how you would use it   def random_method     if single?       puts "single"     elsif multiple?       puts "multiple"     else       raise "please set the AccountSystem.acoun_type_id"     end   end end

What I forgot to mention is that if you do:

module AccountSystem   class << self      attr_accessor :account_system_type   end end

You are actually putting the attr_accessor on the class Module, not on the class that AccountSystem will be included in. You need to use the included method, or use the extend method and refactor your module a bit.

Thanks!!

You made me dive into this matter deep this time. I get the picture now. That's partially then. As I'm still looking for a way to configure things in a way, well like Rails does, e.g. in the initializers: ActiveSupport.escape_html_entities_in_json = false

But then, I don't know wether ActiveSupport here is one big Singleton?! That might be a way to solve it as this functionality would perfectly fit in a Singleton. I will give it a thought....

Jan

Most of the Rails libraries use the following pattern:

class Something   @@config1 = "change_me"   cattr_accessor :config1 end

Something.config1 = "secret code"

Andrew, thanks for the last 'hint'!

It made me realise that I definitely tried to define a class in my module - see the original code - but did not declare class variables. So what I did now, was just change the following (see my original code above): class << self      mattr_accessor :account_system_type end

Notice the MATTR_accessor!

That's it! It's working now as if I hoped it would in the first place. By the way: cattr_accessor works as well naturely.

I appreciate all the comments you made!

Jan