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Some setup you must do manually if you haven't yet:
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Ensure you have defined default url options in your environments files. Here is an example of default_url_options appropriate for a development environment in config/environments/development.rb:
config.action_mailer.default_url_options = { :host => 'localhost:3000' }
In production, :host should be set to the actual host of your application.
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Ensure you have defined root_url to something in your config/routes.rb. For example:
root :to => "home#index"
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Ensure you have flash messages in app/views/layouts/application.html.erb. For example:
<%= notice %>
<%= alert %>
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If you are deploying Rails 3.1 on Heroku, you may want to set:
config.assets.initialize_on_precompile = false
On config/application.rb forcing your application to not access the DB or load models when precompiling your assets.
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