执行rspec spec/requests/authentication_pages_spec.rb -e "signin with invalid information"

提示: ·DEPRECATION WARNING: You didn't set config.secret_key_base. Read the upgrade documentation to learn more about this new config option. (called from get at /home/johnlu/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/forwardable.rb:171)

在网上找到的解决办法： https://github.com/rails-api/rails-api/issues/72 在config/application.rb中加入config.secret_key_base = 'blipblapblup'

在http://edgeguides.rubyonrails.org/configuring.html有说明，但不懂是什么意思！ config.secret_key_base used for specifying a key which allows sessions for the application to be verified against a known secure key to prevent tampering. Applications get config.secret_key_base initialized to a random key in config/initializers/secret_token.rb.

问题是解决了，但迷茫的是为什么要这样设置？