[ruby-on-rails] Check if not nil and not empty in Rails shortcut?

I have a show page for my Users and each attribute should only be visible on that page, if it is not nil and not an empty string. Below I have my controller and it is quite annoying having to write the same line of code @user.city != nil && @user.city != "" for every variable. I am not too familiar with creating my own methods, but can I somehow create a shortcut to do something like this: @city = check_attr(@user.city)? Or is there a better way to shorten this procedure?

users_controller.rb

def show 
  @city = @user.city != nil && @user.city != ""
  @state = @user.state != nil && @user.state != ""
  @bio = @user.bio != nil && @user.bio != ""
  @contact = @user.contact != nil && @user.contact != ""
  @twitter = @user.twitter != nil && @user.twitter != ""
  @mail = @user.mail != nil && @user.mail != ""
end

You can use .present? which comes included with ActiveSupport.

@city = @user.city.present?
# etc ...

You could even write it like this

def show
  %w(city state bio contact twitter mail).each do |attr|
    instance_variable_set "@#{attr}", @user[attr].present?
  end
end

It's worth noting that if you want to test if something is blank, you can use .blank? (this is the opposite of .present?)

Also, don't use foo == nil. Use foo.nil? instead.