Including general variables in modules

Ruby
1

I’m trying to create different scenarios so I thought to do something
like:

file:scenarios.rb

module Scenarios
module Default
$bab=“defaultmodulevalue”
end
module DefaultHidden
$bab=“hiddenmodulevalue”
end
module DefaultSecond
$bab=“secondmodulevalue”
end
end

file:mytest.rb

require ‘scenarios.rb’
include Scenarios::Default
…
puts $bab

but it doesn’t matter which module I include I always have the same
respond:
“secondmodulevalue”

Any ideas for resolving this?

Thanks.

2

On Mar 12, 2008, at 11:49 AM, Mario R. wrote:

$bab=“hiddenmodulevalue”
…
Thanks.
Uh, stop using global variables?

-Rob

Rob B. http://agileconsultingllc.com
[email protected]

3

But I need it. :frowning:

Rob B. wrote:

On Mar 12, 2008, at 11:49 AM, Mario R. wrote:

$bab=“hiddenmodulevalue”
…
Thanks.
Uh, stop using global variables?

-Rob

Rob B. http://agileconsultingllc.com
[email protected]

4

On Mar 12, 2008, at 12:17 PM, Mario R. wrote:

-Rob
Do you really?

Perhaps you can describe your “need” and get a better answer, but why
not something like:

==> scenarios.rb <==
module Scenarios
module Default
def bab; “defaultmodulevalue”; end
end
module DefaultHidden
def bab; “hiddenmodulevalue”; end
end
module DefaultSecond
def bab; “secondmodulevalue”; end
end
end
END

==> these.rb <==
require ‘scenarios’
class ThisOne
include Scenarios::Default
end

class ThatOne
include Scenarios::DefaultSecond
end

puts “ThisOne has #{ThisOne.new.bab}”
puts “ThatOne has #{ThatOne.new.bab}”
END

-Rob

Rob B. http://agileconsultingllc.com
[email protected]

5

so it’s impossible to do it whithout declaring a method…

6

On Mar 12, 2008, at 1:17 PM, Mario R. wrote:

so it’s impossible to do it whithout declaring a method…

You still haven’t defined what “it” really is. Perhaps with a better
description of what you’re hoping to accomplish you could get a better
answer or hint.

-Rob

Rob B. http://agileconsultingllc.com
[email protected]

7

On Wed, Mar 12, 2008 at 10:17 AM, Mario R. [email protected] wrote:

so it’s impossible to do it whithout declaring a method…

That depends what you want, which isn’t clear. If you don’t need to
change the
values (and even if you do, since the constant-ness of Ruby constants
isn’t
enforced, though using them when you don’t want something constant is
usually bad design), you can do without methods:

file:scenarios.rb

module Scenarios
module Default
BAB =“defaultmodulevalue”
end
module DefaultHidden
BAB =“hiddenmodulevalue”
end
module DefaultSecond
BAB =“secondmodulevalue”
end
end

file:mytest.rb

require ‘scenarios.rb’
include Scenarios::Default
…
puts BAB

8

Actually what I want is to include an scenario with all my global
variables and if I want another scenario I can include it and all the
global variables will change.
module Scenarios
module MyFirstSc
$web=“http://www.elmundo.es”
$sqlSearch=“select video from datab”
$user=“Pep”
$password=“xxx”
end
module MySecondSc
$web=“http://www.elmundo.es”
$sqlSearch=“select audiodefault from datab”
$user=“Bee”
$password=“2x8”
end
end

In my test cases I’ll have in the first line for example:
include Scenarios::MySecondSc
and if I want to change the scenario I only have to change this line:
include Scenarios::MyFirstSc

How can I do it without including an extraline with a method?
I know I could do something like:
module Scenarios
module MyFirstSc
def getValues
$web=“http://www.elmundo.es”
$sqlSearch=“select video from datab”
$user=“Pep”
$password=“xxx”
end
end
…
end

and in the first line we’ll write:
include Scenarios::MyFirstSc
Scenarios::MyFirstSc.getValues()

But I don’t like this way I would like to do it in only one line… is
it possible???

Thanks for your time.

9

Hi –

On Thu, 13 Mar 2008, Mario R. wrote:

module MySecondSc
include Scenarios::MyFirstSc
end
it possible???
See Chris’s answer: use constants, and include the module you want.
I’ve been programming in Ruby for 7.5 years and I have no clear memory
of ever having created a global variable. I imagine I have once or
twice, but it’s very, very unlikely that you need to do it or that
it’s the best way to do it in this case.

David

10

Thanks Morel I think this one could be the solution.
But I have a question for you…
Why do you need super(mod)??

Thanks

11

Mario R. [email protected] wrote:

n my test cases I’ll have in the first line for example:
include Scenarios::MySecondSc
and if I want to change the scenario I only have to change this line:
include Scenarios::MyFirstSc

I think this code will do what you require

module Scenarios

module Default
def self.included(mod)
super(mod)
$bab=“defaultmodulevalue”
end
end

module DefaultHidden
def self.included(mod)
super(mod)
$bab=“hiddenmodulevalue”
end
end

module DefaultSecond
def self.included(mod)
super(mod)
$bab=“secondmodulevalue”
end
end
end

Module#included gets sent automatically by Ruby when you include a
module, so you do not need to invoke it explicitly.

12

Splenetico [email protected] wrote:

get done.
OOps, wrong nick :slight_smile:

13

Thanks everybody for your time and suggestions.

14

Mario R. [email protected] wrote:

Thanks Morel I think this one could be the solution.
But I have a question for you…
Why do you need super(mod)??

Because we are replacing (overriding) a previous version of
Module#included.

super(mod) ensures that whatever the previous version did continues to
get done.