open-uri and Kernel.open

[Scott]

I am new ruby usrs (and loving it) and have a question.

By "requiring" opne-uri into my source file I can now reference "http"
addresses as they were local files. It seems that open-uri "hooks"
into the Kernel.open method.

I am just wondering what aspect of the ruby language allows you to do
this. Or is there some mechanism inside of the Kernel that allows you
to register a different protocol?

thanks in advance, scott.

 

[Mohit Muthanna]

The open-uri module simply redefines the Kernel.open method. You can
do it yourself:

module Kernel
private
alias original_open open

def open( blah, *blah_params, &blah_block)
...blah
if some_condition
original_open( blah, *blah_params, &blah_block)
end
end

module_function pen
end


Above, we store the original "open" method in original_open; then we
redefine open, calling the original open function if necessary.

HTH,
Mohit.

I am new ruby usrs (and loving it) and have a question.
=20
By "requiring" opne-uri into my source file I can now reference "http"
addresses as they were local files. It seems that open-uri "hooks"
into the Kernel.open method.
=20
I am just wondering what aspect of the ruby language allows you to do
this. Or is there some mechanism inside of the Kernel that allows you
to register a different protocol?
=20
thanks in advance, scott.
=20
=20
=20

--=20
Mohit Muthanna [mohit (at) muthanna (uhuh) com]
"There are 10 types of people. Those who understand binary, and those
who don't."

 

[Scott]

Thanks for the info. Thats a cool feature of Ruby where you can
redfine existing methods.

 

[Robert Klemme]

Thanks for the info. Thats a cool feature of Ruby where you can
redfine existing methods.

One of the most widely used features...

Btw, you don't need this line:

Kind regards

robert