Something I always run in to. I want to do this:
if current_user.exists? && current_user.role == "admin"
# Do something
end
Obviously if current user does not exist then this does not work as it returns undefined method role for nil class
Is there a way I can achieve the above in one line without multiple If statements?
Try:
if current_user&.role == "admin"
& is a safe navigator - if the part before it is nil, the rest of the method chain won't execute and simply returns nil rather than throwing an error.
More reading: http://mitrev.net/ruby/2015/11/13/the-operator-in-ruby/
You can use traditional .try
current_user.try(:role) == "admin"
or safe navigation operator for which is faster &. if you're using ruby >= 2.3.0
current_user&.role == "admin"