What does the "mount" instruction mean in Rails routing?

Question

I cannot find the meaning of the keyword "mount" in Rails routing system.

I have set up Mercury to use within my Rails application. It added this line to my routes.rb config file:

Appname::Application.routes.draw do
  mount Mercury::Engine => '/'

What does the mount keyword mean?

http://apidock.com/rails/ActionDispatch/Routing/Mapper/Base/mount — BroiSatse, Mar 03 '14 at 11:07

score 24 · Accepted Answer · edited Oct 31 '16 at 13:41

24

Mount within the Rails routes does the equivalent of a Unix mount.
It actually tells the app that another application (usually a Rack application) exists on that location.

It is used mostly for Rails Engines.

edited Oct 31 '16 at 13:41

Flip

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answered Mar 03 '14 at 11:10

xlembouras

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Thank you for your answer. I did not know about Rails engines! – Gabriel S. Mar 03 '14 at 11:43

score 12 · Answer 2 · answered Mar 03 '14 at 11:07

12

Mounting an engine means that the functionality from that engine is available inside your application.

See http://guides.rubyonrails.org/engines.html#mounting-the-engine

answered Mar 03 '14 at 11:07

sevenseacat

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What does the "mount" instruction mean in Rails routing?

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