Railsのdeviseでsecret_keyを設定

Devise.secret_key was not set.
Please add the following to your Devise initializer: (RuntimeError)

config.secret_key = '90dexxxxx' 下記のファイルにsecret_keyを設定

vi config/initializers/devise.rb

 Devise.setup do |config|
  config.secret_key = '90dexxxxx'
 end