Absolute URL's with link_to...Ruby on Rails

Question

Is it possible to generate absolute URL's in rails using link to? [NOTE: THIS IS IN A MAILER]

I tried to do:

<%= link_to root_url, root_url%>

But I get a runtime error:

*Missing host to link to! Please provide :host parameter or set default_url_options[:host]*

I need this to be dynamic because the application will run on a wildcard domain (*.domain.com)

Why do you need the URL to be absolute in this case? A relative URL will be relative to the current host, which sounds like what you want — Gareth, Feb 25 '11 at 13:11
The only reason I can think of is that it's because this link is going to be embedded in an e-mail. Is that what's happening here Chris? — Paul Russell, Feb 25 '11 at 13:34
appears possible using :only_path => false see http://stackoverflow.com/q/9389874/32453 — rogerdpack, Jan 16 '14 at 20:37
http://blog.grepruby.com/2015/04/absolute-url-full-url-in-rails-4.html — user3118220, Apr 17 '15 at 12:31

score 51 · Answer 1 · answered Feb 25 '11 at 13:31

51

If you use the _url suffix, the generated URL is absolute. Use _path to get a relative URL.

<%= link_to "Home", root_url %>

<%= link_to "Home", root_path %>

answered Feb 25 '11 at 13:31

Simone Carletti

3

That works fine from a regular view, but from a mailer I am not having as much luck... – Chris Muench Feb 25 '11 at 13:43
5

In Mailer you need to pass or configure a default host. – Simone Carletti Feb 25 '11 at 14:04
2

What happens if the host is dynamic though. *.domain.com? – Chris Muench Feb 25 '11 at 14:13
2

This is awesome. I can do `route_name_url(param)` with that instead of `route_name_path(param)`. It's that easy. – Ben Kreeger Jul 14 '11 at 19:45

score 7 · Answer 2 · edited Sep 23 '14 at 00:38

7

Depending on your use case, string interpolation might be a good solution:

link_to(body, "http://#{site_url}")

edited Sep 23 '14 at 00:38

user456584

answered Nov 06 '11 at 23:28

Simon Liu

score 4 · Accepted Answer · answered Feb 25 '11 at 14:51

4

I found this plugin:

and it works great!

answered Feb 25 '11 at 14:51

Chris Muench

Awea · Answer 4 · 2013-03-03T12:37:04.787

0

In routes.rb insert :

root :to => 'controller#action'

Or replace your current map.root with the correct one.

See documentation about this : routes.rb usage

edited Mar 03 '13 at 12:37

answered Feb 25 '11 at 13:07

Awea

Pretty sure that "map" in routes.rb is for Rails 2 only. – Tronathan Mar 03 '13 at 04:03

4 Answers4