Not all Image methods are obtainable with .method

[Nakilon]

I wonder if anything can be improved here:

irb> im.bands
=> 3
irb> im.method(:bands)
=> #<Method: Vips::Image#bands>
irb> im.hist_find
=> #<Image 256x1 uint, 3 bands, histogram>
irb> im.method(:hist_find)
NameError: undefined method `hist_find' for class `Vips::Image'

I know it's something done via the method_missing but it's weird that only a half of methods have the issue. I guess it also confuses the did_you_mean built-in gem -- it can't to give an advice sometimes because the method you want is somewhere deep in Operations.

[jcupitt]

Hiya, sorry, I've no idea. Does anyone have any suggestions?

The ruby-vips Image class implements method_missing, respond_to_missing? and respond_to?, but perhaps there's something more or different we should be doing?

https://github.com/libvips/ruby-vips/blob/master/lib/vips/image.rb#L193-L230

I think implementing respond_to_missing? is supposed to be enough to make #method function, but it's obviously not working for us for some reason.

https://thoughtbot.com/blog/always-define-respond-to-missing-when-overriding