Running Rails as an embedded app inside of a gem

Posted by randombits on Stack Overflow See other posts from Stack Overflow or by randombits
Published on 2010-03-24T21:31:56Z Indexed on 2010/03/24 21:43 UTC
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I'm trying to understand what exactly the above (in my question's Title) means? This is taken directly from the SpreeCommerce.com project:

If you’re an experienced Rails developer you may be wondering where your app directory is. Spree actually runs as an embedded Rails app inside of your gem. How do you customize things then? We’ll cover that later in extensions.

Source: http://spreecommerce.com/documentation/getting_started.html

Can someone further explain what exactly it means when a Rails app is run "inside of your gem"

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