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Hi Guys,

I am trying to use define_method like:

class TestClass
def initialize
define_method("hello") { || puts "Hello" }
end
end

x = TestClass.new
x.hello

I am always getting:
NoMethodError: undefined method `define_method'

Do I need to require something? Am I doing something wrong, or am I
completely missing the boat!?


Any help appreciated!

Thanks,
Malcolm.

On Nov 6, 11:37 pm, "Malcolm Lockyer" <maxpeng...@gmail.com> wrote:
> Hi Guys,
>
> I am trying to use define_method like:

def selfclass
(class << self; self; end)
end

class TestClass
def initialize
selfclass.send(:define_method, "hello") { || puts "Hello" }
end
end

x = TestClass.new
x.hello

You are getting this error since define_method is defined in Module
not Object. Your object needs to call define_method against it's Class
definition, not self.

Here's an example how to use it.
http://www.ruby-doc.org/core/classes...e.html#M001677

Best,
Jake

On Nov 6, 2007, at 10:37 PM, Malcolm Lockyer wrote:

> Hi Guys,
>
> I am trying to use define_method like:
>
> class TestClass
> def initialize
> define_method("hello") { || puts "Hello" }
> end
> end
>
> x = TestClass.new
> x.hello
>
> I am always getting:
> NoMethodError: undefined method `define_method'
>
> Do I need to require something? Am I doing something wrong, or am I
> completely missing the boat!?
>
>
> Any help appreciated!
>
> Thanks,
> Malcolm.
>

2007/11/7, Malcolm Lockyer <>:
> Hi Guys,
>
> I am trying to use define_method like:
>
> class TestClass
> def initialize
> define_method("hello") { || puts "Hello" }
> end
> end
>
> x = TestClass.new
> x.hello
>
> I am always getting:
> NoMethodError: undefined method `define_method'
>
> Do I need to require something? Am I doing something wrong, or am I
> completely missing the boat!?

Is this really your use case? Since you know which method you define,
you can do it with a normal def anyway. So I suspect that you are
doing something else. What exactly is it?

Kind regards

robert

--
use.inject do |as, often| as.you_can - without end

Hey, thanks for the replies guys, I am pretty noob with ruby so thanks
for your help.

Yes Robert, that wasn't my use case - that was just the most
simplified code that shows the problem I was having. I didn't want to
bore you all with loads of irrelevant code. If you are interested I
was trying to build a dynamic enumeration style class (vaguely similar
to java or c#'s way of doing it), where I could have the pseudo
constant (i.e. TestClass.Blue, TestClass.Red etc.) setup by calling
the constructor something like TestClass.new(:Blue => 1, :Red => 2
etc.) and also be able to iterate through the keys and stuff.


Anyway, thanks again for your help guys.
Malcolm

On 11/8/07, Malcolm Lockyer <> wrote:
> Hey, thanks for the replies guys, I am pretty noob with ruby so thanks
> for your help.
>
> Yes Robert, that wasn't my use case - that was just the most
> simplified code that shows the problem I was having. I didn't want to
> bore you all with loads of irrelevant code. If you are interested I
> was trying to build a dynamic enumeration style class (vaguely similar
> to java or c#'s way of doing it), where I could have the pseudo
> constant (i.e. TestClass.Blue, TestClass.Red etc.) setup by calling
> the constructor something like TestClass.new(:Blue => 1, :Red => 2
> etc.) and also be able to iterate through the keys and stuff.
>
>
> Anyway, thanks again for your help guys.
> Malcolm
>
> On 11/8/07, Robert Klemme <> wrote:
> > 2007/11/7, Malcolm Lockyer <>:
> > > Hi Guys,
> > >
> > > I am trying to use define_method like:
> > >
> > > class TestClass
> > > def initialize
> > > define_method("hello") { || puts "Hello" }
> > > end
> > > end
> > >
> > > x = TestClass.new
> > > x.hello
> > >
> > > I am always getting:
> > > NoMethodError: undefined method `define_method'
> > >
> > > Do I need to require something? Am I doing something wrong, or am I
> > > completely missing the boat!?
> >
> > Is this really your use case? Since you know which method you define,
> > you can do it with a normal def anyway. So I suspect that you are
> > doing something else. What exactly is it?
> >
> > Kind regards
> >
> > robert
> >
> > --
> > use.inject do |as, often| as.you_can - without end
> >
> >
>

Please do not top post.

On 07.11.2007 22:19, Malcolm Lockyer wrote:
> Yes Robert, that wasn't my use case - that was just the most
> simplified code that shows the problem I was having. I didn't want to
> bore you all with loads of irrelevant code. If you are interested I
> was trying to build a dynamic enumeration style class (vaguely similar
> to java or c#'s way of doing it), where I could have the pseudo
> constant (i.e. TestClass.Blue, TestClass.Red etc.) setup by calling
> the constructor something like TestClass.new(:Blue => 1, :Red => 2
> etc.) and also be able to iterate through the keys and stuff.

In case you are not doing it for the fun of it and / or are looking for
more inspirations this is a good place to look:

http://raa.ruby-lang.org/search.rhtml?search=enum

Kind regards

robert