From: leandro moreira <leandro.rhcp99@...>
Date: 2011-07-23T04:03:15+09:00
Subject: Re: create object by reflection

It's not working. Suppose I have the builder and RSpec and I tried to 
use the approach but both tests failed (String fails because it can't 
convert array to String, and second because wrong number of arguments (1 
for 2)

I'm using ruby 1.9.1(1.9.2b)

class Make
 attr_accessor :instances
 def initialize
  @instances = {}
 end
 def build(instance,clazz,*args)
  if args == nil
   @instances[instance] = Object.const_get(clazz).new
  else
   @instances[instance] = Object.const_get(clazz).new(args)
  end
 end
end

And it's RSpec

describe Make do
 before(:all) do
  @make = Make.new
 end
 describe "Make Instruction" do
  it "should keep an instance of String" do
   created_object = "test"
   @make.build "instance01", "String",["test"]
   @make.instances["instance01"].should == created_object
  end
  it "should keep an instance of Foo" do
   @make.build "instance02", "Foo",["one","two"]
  end
 end
end

class Foo
 attr_accessor :one, :two
 def initialize(one,two)
  @one = one
  @two = two
 end
end


And the ouput from RSpec is:
  1) ---
     Failure/Error: @make.build "instance01", "String",["test"]
     TypeError:
       can't convert Array into String
     # ./lib/instructions/make.rb:11:in `initialize'
     # ./lib/instructions/make.rb:11:in `new'
     # ./lib/instructions/make.rb:11:in `build'
     # ./spec/make_spec.rb:11:in `block (3 levels) in <top (required)>'

  2) ---
     Failure/Error: def initialize(one,two)
     ArgumentError:
       wrong number of arguments (1 for 2)
     # ./spec/make_spec.rb:22:in `initialize'
     # ./lib/instructions/make.rb:11:in `new'
     # ./lib/instructions/make.rb:11:in `build'
     # ./spec/make_spec.rb:15:in `block (3 levels) in <top (required)>'

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