Rails core - Feb 2014 - Convention over configuration and the Rails.root-tmp-folder

Hi,

I started to write a tiny rails app which comes completely as a ruby gem. 
Since this app has a big cousin in rails I did not want to use another 
framework like sinatra.

Since the app is a gem, I do not want it to store runtime-files in the 
tmp-folder. So I thought I should not stay with the convention but 
configure the location of the tmp-folder. But as far as I can see, there is 
no way to configure it.

I searched the source code and found lines like this one:

./railties/lib/rails/application/configuration.rb:        
@cache_store                   = [ :file_store, "#{root}/tmp/cache/" ]

As one can see, the tmp-folder does not follow convention over 
configuration but is hard coded.

So what about adding a configuration option? I am using Rails 4.1.

Regards
Thomas

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