Shad Sterling
5/21/2005 6:22:00 AM
On 5/20/05, johng <jgoalby@gmail.com> wrote:
> Hi,
>
> In message "Re: Anonymous module undefined method error"
> on Sat, 21 May 2005 06:45:15 +0900, "johng" <jgoa...@gmail.com>
> writes:
>
> |
>
> I am new to Ruby so please excuse my question. I did search
> |usenet for an answer but couldn't find one:
> |
> |I have a variable, data, that was read from a file and has the
> |following contents:
> |
> |def foo
> | return "foo"
> |end
> |
> |My code is this:
> |
> |amodule = Module.new
> |amodule.class_eval(data)
> |
> |puts(amodule.public_instance_methods) -> outputs "foo"
> |
> |amodule.foo -> fails saying method is
> undefined
>
> |A public *instance* method means methods are available for their
> |instances, "amodule" is a module, not an instance. When you include a
> |module to a class, and instantiate from the class, you can call "foo".
> |
> | matz.
>
> Ah, ok, I was fooled by the Module.new. I had assumed that it made
> an instance.
>
> So, what I wanted to do, was have a class defined in a file and call
> a known method on it. For instance:
>
> class Bar
> def Bar.foo
> return "foo"
> end
> end
>
> But I will not know the class name contained in the file (Bar). I
> tried
> the approach from the original post so that I could call a defined
> method that would instantiate the class for me. I believe I can do
> this now relatively easily. It does though put more requirements
> on the file.
>
> I wonder though, if there is a cleaner way?
>
> Thanks,
>
> John.
>
>
>
more requirements on the file? you can do the same thing, you just
have to create an instance:
-bash: [~]$ cat testdata
def foo
"foo!"
end
-bash: [~]$ cat test.rb
data = File.read( "testdata" )
aclass = Class.new
aclass.class_eval( data )
a = aclass.new
puts a.foo
-bash: [~]$ ruby test.rb
foo!
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