Rails core - Jun 2014 - Feature Request: Remove or replace *_path helpers for mailers

Here's a change in behavior I would love on the mailers.

## Backstory

When you send an email, you'll likely need links. Those links must be the
full path i.e. 'http://example.com/foo' instead of relative (just
'/foo').
Unfortunately most devs are so used to using the *_path helpers, they use
them in emails by mistake.

I made this mistake recently with http://www.codetriage.com, here's the PR
that fixes it (https://github.com/codetriage/codetriage/pull/257). The sad
part is I didn't realize there was a problem until a user got an email and
couldn't click on a link. Then they had to be nice enough to report it. If
your business is running on Rails, this may take days. I've been doing this
for years, and it still happens to me.


## Feature

Here's what I would like to see happen. Either raise an exception when
*_path helpers are used in a mail template so my tests would have caught
it, or likely just have *_path helpers resolve to the full URL by default.
What do you think?


--
Richard Schneeman

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