ahabman

I’m using mod_rails with capistrano and multi-stage (qa, staging, production), and wrote this workaround so that the RAILS_ENV could be set correctly in each stage.  Mod_rails sets RAILS_ENV once in the global server conf file, but I needed it set once for each environment: qa, staging, and production.  I tried setting ENV['RAILS_ENV] in each file under config/deploy/ but the setting was not picked up.

Solution - write the correct value into config/environment.rb’s  ENV[''RAILS_ENV] while deploying.

So here is my 3 step fix -

Step 1.

I created a new file

lib/set_mod_rails_env.rb

# sets ENV['rails_env'] for mod_rails

# http://www.megasolutions.net/ruby/search-a-file-and-replace-text-50116.aspx

# Robert Evans'

def ChangeOnFile(file, regex_to_find, text_to_put_in_place)

  text = File.read file

  File.open(file, 'w+'){|f| f << text.gsub(regex_to_find,

      text_to_put_in_place)}

end

ChangeOnFile("#{ARGV[0]}/config/environment.rb”, /#mod_rails_env_here/, “ENV['RAILS_ENV']=’#{ARGV[1]}’”)

Step 2.

Add the following code to config/deploy.rb

namespace :deploy do

desc "set ENV['RAILS_ENV'] for mod_rails”

task :before_restart do

run "ruby #{current_release}/lib/set_mod_rails_env.rb  #{current_release}  #{stage}"

end

end

Step 3.

Add the following code to config/environment.rb

# deploy.rb will swap this out for the appropriate rails_env.

# mod_rails apparently need this var in this file (not ./environments/qa.rb)

# do not change the following line. Ruby regexp looks for it.

#mod_rails_env_here

That’s it.  Let me know if you know of an easier way.