Today I discovered there are callbacks on associations and was pretty
excited for the benefits. I was looking for a solution to run some code
when adding and removing the audio record from a podcast episode.

After reading the association guide
<http://guides.rubyonrails.org/association_basics.html#association-callbacks>,
it looked like it would work with belongs_to. After getting an error, I
found https://github.com/rails/rails/issues/586.

I'd be willing to create a PR for it if I can figure it out, but I wanted
to check to make sure it's something that's still wanted. The workaround
mentioned in the issue seems hacky. It's also something you'd expect to
exist if you already had been using callbacks with has_many.

Let me know your thoughts.

Thanks,
Tom

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