With Convention over configuration, you can usually trust the defaults to
get you there. In this case, not so much. I've been banging my head on the
wall for a few hours now, in between trying things and researching.
For the usual cases, how do I set up an AJAX form. Is it using JS or JSON
format?
**Case 1: `form_for remote: true` default, `format.js`**
UJS sends a request as JS.
Exception: Missing template for update.js.
`form_for remote: true, format: :json`
No difference in HTML output, though `form_for` doc examples says you can
do that.
**Case 2: `form_for remote: true, html: {"data-type" => :json}` not the
default**
Responder will answer 204, but why is this not default in either `form_for`
or UJS?
What is the expected use case and can it be documented? I suspect it's the
latter, but I expected there to be good defaults in place.
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