Rails core - Sep 2014 - Support for nested parameters in button_to params option

In this commit
<https://github.com/rails/rails/commit/e6e0579defcfcf94ef1c4c1c7659f374a5335cdb>
the
`params` option was added to the `button_to` helper. However, the patch
doesn't support nested hashes so `{a: {b: 'c'}}` for example gets
turned
into a hidden form input with the name 'a' and the value being the
string
representation of the `{b: 'c'}` nested hash.

Since Rails supports nested hashes everywhere else (and even in the URL
params of link_to and button_to), I believe this to be a bug/unfinished
feature. Unless the other disagree with that assessment, I'm planning to
submit a patch to add the missing functionality.

I had question though on implementation: I can't find any support in Rails
for turning a nested hash into a list of name/value pairs for form inputs.
`to_query` exists on Hash, of course, but it specifically escapes the keys
and joins the keys and values as fits a URI. In my patch I can either write
one-off code within the button_to helper to accomplish what I need, or I
can add a new Hash extension to ActiveSupport. What's the best/expected way
to go about tackling this issue?

Thanks,
James

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