From: Sergey Sheypak <serega.sheypak@...>
Date: 2010-02-11T17:47:49+09:00
Subject: Newbee question. Runtime classloading

Hello, I'm Java developer and now explore Ruby for increasing
programming knowledge. I want to understand runtime class loading

I have an application:
/lib/parser_factory.rb
class ParserFactory
end

/lib/parser_format_x.rb
class ParserFormatA
end
/lib/parser_format_y.rb
class ParserFormatB
end
/lib/parser_format_z.rb
class ParserFormatC
end

ParserFactory gets file and decides which parser to initialize and use.
I have such code in ParserFactory:
clz = "ParserFormat#{@version}"
parser_impl = Kernel.const_get(clz)
and I get an error:

Test-unit version : 2.0.1 loaded

1) Error:
test_parsing(ParserTest):
NameError: uninitialized constant Kernel::ParserPlanFormat1_0
D:/Ruby_1_86_27/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:2237:in
`const_missing'

I don't get how I have to specify path to class. I've tried it as in
Java: "parsers/SomeClass", but it didn't help :)

Also i'm exploring Ruby on Rails and
Kernel.const_get("MyFavouriteModelClass") works there.

Please explain or give guide to read.
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