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comp.lang.ruby

Container wont contain! (noob question

Extreme Noob

5/11/2008 8:22:00 PM

Here I want to change Class1's var2 to equal 2. Now, I can do this by..
"object.m_container.container1 = Class1.new(2)", but I want to do it
with "object.change_me = 2"
Point is I want to change that variable by simply using a number, as
apposed to xxx.new(arg).
Why wont object.change_me =2 work?

(sorry if this seems confusing or silly)

The following is a highly simplified representation of my current
problem....

#******************************************************************

class Class1

def initialize(aVar)
@var = aVar
@var2 = nil
if @var == 1 then @var2 = 1 elsif @var == 2 then @var2 = 2 end
end
end

class Class2
attr_accessor :container1

def initialize(container1)
@container1 = container1
end
end

class M_class
attr_accessor(:m_container,:change_me)

def initialize
@m_container = Class2.new(Class1.new(change_me) )
end

def change_me
@change_me = 1
end
end


object = M_class.new

#object.m_container.container1 = Class1.new(2) <--- currently doing it
like this

#object.change_me = 2 <----- want to do it like this (or something as
easy)

p object

#*******************************************************
--
Posted via http://www.ruby-....
4 Answers

Sandro Paganotti

5/11/2008 8:45:00 PM

0

MMH... you can try add this function to M_class

def change_me=(val)
@m_container.container1 = Class1.new(val)
end

and then call

object.change_me = 2

Sandro




On Sun, May 11, 2008 at 8:22 PM, Extreme Noob <bengalyean@hotmail.com> wrote:
> Here I want to change Class1's var2 to equal 2. Now, I can do this by..
> "object.m_container.container1 = Class1.new(2)", but I want to do it
> with "object.change_me = 2"
> Point is I want to change that variable by simply using a number, as
> apposed to xxx.new(arg).
> Why wont object.change_me =2 work?
>
> (sorry if this seems confusing or silly)
>
> The following is a highly simplified representation of my current
> problem....
>
> #******************************************************************
>
> class Class1
>
> def initialize(aVar)
> @var = aVar
> @var2 = nil
> if @var == 1 then @var2 = 1 elsif @var == 2 then @var2 = 2 end
> end
> end
>
> class Class2
> attr_accessor :container1
>
> def initialize(container1)
> @container1 = container1
> end
> end
>
> class M_class
> attr_accessor(:m_container,:change_me)
>
> def initialize
> @m_container = Class2.new(Class1.new(change_me) )
> end
>
> def change_me
> @change_me = 1
> end
> end
>
>
> object = M_class.new
>
> #object.m_container.container1 = Class1.new(2) <--- currently doing it
> like this
>
> #object.change_me = 2 <----- want to do it like this (or something as
> easy)
>
> p object
>
> #*******************************************************
> --
> Posted via http://www.ruby-....
>
>



--
Go outside! The graphics are amazing!

7stud --

5/11/2008 9:05:00 PM

0

Extreme Noob wrote:
> Here I want to change Class1's var2 to equal 2. Now, I can do this by..
> "object.m_container.container1 = Class1.new(2)", but I want to do it
> with "object.change_me = 2"
> Point is I want to change that variable by simply using a number, as
> apposed to xxx.new(arg).
> Why wont object.change_me =2 work?
>
> (sorry if this seems confusing or silly)
>
> The following is a highly simplified representation of my current
> problem....
>
> #******************************************************************
>
> class Class1
>
> def initialize(aVar)
> @var = aVar
> @var2 = nil
> if @var == 1 then @var2 = 1 elsif @var == 2 then @var2 = 2 end
> end
> end
>
> class Class2
> attr_accessor :container1
>
> def initialize(container1)
> @container1 = container1
> end
> end
>
> class M_class
> attr_accessor(:m_container,:change_me)
>
> def initialize
> @m_container = Class2.new(Class1.new(change_me) )
> end
>
> def change_me
> @change_me = 1
> end
> end
>
>
> object = M_class.new
>
> #object.m_container.container1 = Class1.new(2) <--- currently doing it
> like this
>
> #object.change_me = 2 <----- want to do it like this (or something as
> easy)
>
> p object
>
> #*******************************************************


That's pretty confusing. How about this:

class Class1
attr_accessor :var2

def initialize(aVar)
@var = aVar
@var2 = nil

if @var == 1
@var2 = 1
elsif @var == 2
@var2 = 2
end
end

end



class Class2
attr_accessor :container1

def initialize(container1)
@container1 = container1
end

end



class M_class
attr_accessor :m_container

def initialize
@m_container = Class2.new(Class1.new(1) )
end

def set_var2=(val)
@m_container.container1.var2 = val
end

def get_var2
@m_container.container1.var2
end

end


obj = M_class.new
obj.set_var2 = 2

puts obj.get_var2
--
Posted via http://www.ruby-....

Extreme Noob

5/11/2008 9:06:00 PM

0

Wow, didn't know about that =() function. Thanks for the help


Sandro Paganotti wrote:
> MMH... you can try add this function to M_class
>
> def change_me=(val)
> @m_container.container1 = Class1.new(val)
> end
>
> and then call
>
> object.change_me = 2
>
> Sandro

--
Posted via http://www.ruby-....

7stud --

5/11/2008 9:18:00 PM

0

Extreme Noob wrote:
> Wow, didn't know about that =() function. Thanks for the help
>
>

Look at this class:


class Dog
def initialize(name)
@name = name
end

def name=(a_name)
@name = a_name
end

def name
return @name
end
end


d = Dog.new("Spot")
puts d.name

d.name = "Rover"
puts d.name


The Dog class above is equivalent to:

class Dog
attr_accessor :name

def initialize(name)
@name = name
end

end


In other words, the line:

attr_accessor :name

creates the methods "name=" and "name" for you.
--
Posted via http://www.ruby-....