Alle venerd=EC 2 marzo 2007, (e-mail address removed) ha scritto:
Hi,
I'm using fxri and I have required a ruby file as follows:
require "c:\myWork\motor.rb"
My question is, how do I reload this file when I make changes?
Thanks.
I assume you're speaking about the irb session embedded in fxri. If I'm wro=
ng,=20
my answer won't be very useful.
I think the cleanest way to reload a file is to use the load method:
load 'c:\myWork\motor.rb'
(note that with load you need to specify the extension).
Different from require, load doesn't check whether the file already is in $=
"=20
(the list of required files), although this is not explicitly said in the r=
i=20
documentation, and can't load C extensions.
Another way to reload the file should be to remove it from $" and use requi=
re.
In both cases, you must be careful. Suppose the file a.rb contains the=20
following:
=2D--File a.rb---
class C
def method1
"method1"
end
def method2
"method2"
end
end
In the interactive session, you do:
require 'a' #you could also do load 'a.rb'
c=3DC.new
c.method1
=3D> "method1"
c.method2
=3D> "method2"
Then you modify a.rb:
=2D--File a.rb modified---
class C
def method2
"method2"
end
end #you removed the definition of method1
You go back to the interactive session and type
c.method2
=3D> "method2"
c.method1 #you'd expect a NoMethodError, since the method has been removed.
=3D> "method1"
c1=3DC.new #create a new instance of C using the last definition
c1.method1
=3D>NoMethodError
The point is that loading the file again doesn't clear whatever it was defi=
ned=20
in it the first time it was loaded. I think (but I'm only guessing) that=20
loading for a second time a file which contains a class or a module looks a=
=20
bit like (but it's different from) reopening the class or module. For=20
instance, if in the modified a.rb you'd added the line=20
undef_method :method1
inside the definition of C, then calling c.method1 would have raised a=20
NoMethodError.
I hope all this helps
Stefano
