Can't assign nil to node attributes

[neilconway]

require 'rubygems'
require 'graphviz'

# Create a new graph                                                                                                                                                                                        
g = GraphViz.new( :G, :type => :digraph )

# Create two nodes                                                                                                                                                                                          
hello = g.add_node( "Hello" )
hello.color = nil
world = g.add_node( "World" )

# Create an edge between the two nodes                                                                                                                                                                      
g.add_edge( hello, world )

# Generate output image                                                                                                                                                                                     
g.output( :png => "hello_world.png" )

With 0.9.21, this works; with 1.0.4, this raises an exception:

graphviz/attrs.rb:62:in `[]=': Invalide value `` for attribute `color` : undefined method `empty?' for nil:NilClass (AttributeException)

This breaks backward compatibility.

[glejeune]

Hum... Using "nil" as a color does not seems to be normal. But you are right, if this breaks backward compatibility, I have to do something.

My proposition :

If you passe nil as a value for an attribute, this attribute will be ignored and you'll receive a warning.

Is it ok for you ?

[neilconway]

That would work. (Fixing my own code isn't hard to do, either -- I just thought I'd mention the issue as a possible backward compat concern.)

[glejeune]

I made a correction. You can upgrade to 1.0.5. Thanks