On Saturday, January 5, 2013 4:00:02 PM UTC-5, Jan E. wrote:
>
> How is that contradictory? Are you sure you got the return values of
> respond_to_missing? right? Because I guess you want to return *true* for
> :to_ary?
>
> respond_to? first checks if the method is actually, physically there. If
> that's not the case, it checks for respond_to_missing?
>
> In your case both checks return "false", so you end up with "false" just
> like you should.
>
>
Yes, that is what it should do. But notice #flatten doesn't seem to notice
that it returns false. It still calls #to_ary on it,
class Baz
def method_missing(s); s; end
def respond_to_missing?(s, x)
return false if s == :to_ary
true
end
end
[Baz.new].flatten
=> in `flatten': can't convert Baz to Array (Baz#to_ary gives Symbol)
(TypeError)
Even though it appears to work fine if one overrides #respond_to? directly.
class Baz
def method_missing(s); s; end
def respond_to?(s, x)
super unless s == :to_ary
end
end
[Baz.new].flatten => [#<Baz:0x007f8d3115c7d0>]
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