Passing args from within method_missing

Ruby
1

Hi,

I have an hash of code blocks(procs?), @styles, and am trying to call
these using method missing. Problem is, some take one argument, and
others take two, and I can’t seem to pass args to them without if
being passed as an array

Here’s the method_missing code

def method_missing style_type, *args
case args.size
when 1 : @styles [style_type].call(args[0])
when 2 : @styles [style_type].call(args[0], args[1])
end
end

I’m sure there’s a way for me to get rid of the case statement, but
if I try
@styles [style_type].call(args) it just gets sent an array.

Question is, how do I send the contents of the args array?

I realise I should probably have a means of dealing with a genuine
method_missing. What’s the ‘ruby way’ of doing this? if I call
method_missing again, wont I end in a recursive mess?

Is this making any sense?

Cheers,
Dave

2

Sharon P. wrote:

@styles [style_type].call(args) it just gets sent an array.

Isn’t “@styles [style_type].call(*args)” what you are looking for?

Wolfgang Nádasi-Donner

3

def method_missing style_type, *args
@styles[style_type].call(*args)
end

I hope this helps

Certainly does. I knew it would be something simple, just couldn’t
figure it out and my Pickaxe is at work…

Thanks heaps Stefano and Wolfgang

4

Alle mercoledì 13 giugno 2007, Sharon P. ha scritto:

 case args.size

Question is, how do I send the contents of the args array?

I realise I should probably have a means of dealing with a genuine
method_missing. What’s the ‘ruby way’ of doing this? if I call
method_missing again, wont I end in a recursive mess?

Is this making any sense?

Cheers,
Dave

def method_missing style_type, *args
@styles[style_type].call(*args)
end

I hope this helps

Stefano

5

On 6/13/07, Sharon P. [email protected] wrote:

I’m sure there’s a way for me to get rid of the case statement, but
if I try
@styles [style_type].call(args) it just gets sent an array.

Question is, how do I send the contents of the args array?

I realise I should probably have a means of dealing with a genuine
method_missing. What’s the ‘ruby way’ of doing this? if I call
method_missing again, wont I end in a recursive mess?

def method_missing(symbol, *args)
if prc = @styles[symbol]
prc.call(*args)
else
super
end
end

–
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/

IPMS/USA Region 12 Coordinator
http://ipmsr12.denhaven2.com/

Visit the Project Mercury Wiki Site
http://www.mercuryspacecraft.com/