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comp.lang.ruby

could someone explain this CGI problem ?

lars.gersmann

1/3/2006 1:27:00 PM

the following code sequence

cgi.div{
1..3.times{ |i|
cgi.div{
"hello from div"
}
}
}

produces

<DIV>
1..3
</DIV>

but i wanted to produce

<DIV>
<DIV>
huhu
</DIV>
<DIV>
huhu
</DIV>
<DIV>
huhu
</DIV>
</DIV>

could someone point me how to get the right result ?
5 Answers

dblack

1/3/2006 1:44:00 PM

0

Patrick Gundlach

1/3/2006 1:48:00 PM

0


> the following code sequence
>
> cgi.div{
> 1..3.times{ |i|
> cgi.div{
> "hello from div"
> }
> }
> }
>
> produces
>
> <DIV>
> 1..3
> </DIV>

This is, because the 1..3..... statement returns "1..3" and this is
what cgi gets. Try it with irb.

perhaps this works (untested)



> cgi.div{
temp_string=""
> 1..3.times{ |i|
temp_string << cgi.div{ "hello from div" }
> }
temp_string
> }

i.e. it collects the divs in a temporary string and gives that to the
outer div.

Patrick

John Maclean

1/3/2006 2:09:00 PM

0

Hey chaps,

I'd just like to check that the following uses methods and that no classes or instance variables are created. I see that there are no @instance_variables..
Where's the object? What class is being used?
Am I correct in saying that say_goodnight is a method, where (name) is the parameter for it?

#!/usr/bin/ruby
# Tue Dec 27 15:42:59 GMT 2005
# from page 13 of the pick-axe book
def say_goodnight(name)
"Good night, #{name.capitalize}"
# we use the output of the last result - this save time
end
# Time for bed...
puts say_goodnight('jayeola')
puts say_goodnight('john-Boy')
puts say_goodnight('mary-Ellen')
puts say_goodnight('mary-loo')
puts say_goodnight('silly-slapper')
puts say_goodnight('hex-editor')


--
John Maclean
MSc (DIC)
07739 171 531

lars.gersmann

1/3/2006 3:38:00 PM

0

thanks - this was the hint i needed !

regards,

lars

Kero van Gelder

1/4/2006 12:13:00 PM

0

> I'd just like to check that the following uses methods and that no classes
> or instance variables are created. I see that there are no
> @instance_variables..
>
> Where's the object?

try
ruby -e 'p self'
(as if executing a ruby file containing "p self" and nothing else)
it prints "main".
Apparently the object sees itself as main. ok.

> What class is being used?

do
ruby -e 'p self.class'
it prints "Object"
so main is an Object. tadaa!
(actually, it is a bit more than "just" an Object, but you can figure that
out yourself when you learn about Modules and mixin)

What should you learn from this? Everything is an object. Really. But if you
want to do some simple procedural stuff, the objects do not get in your way.
They can be, as you experienced, completely invisible. That's one of many,
many reasons I like Ruby so much :)


> Am I correct in saying that say_goodnight is a method, where (name) is the
> parameter for it?

absolutely correct

> #!/usr/bin/ruby
> # Tue Dec 27 15:42:59 GMT 2005
> # from page 13 of the pick-axe book
> def say_goodnight(name)
> "Good night, #{name.capitalize}"
> # we use the output of the last result - this save time
> end
[snip]