///Booking Controller///
	@user = User.generate_random_password
	@user.save

///User.rb///
def self.generate_random_password
    generated_password = Devise.friendly_token.first(8)
    user = User.create!(:email => "james@james.com", :firstname => "jamo", :gender => "male", :password => generated_password)
  end

This creates the a new user in the DB with the fields mentioned above, when you submit the booking form.

What I cant get working is passing the information from the booking form below into the model.

///booking form///
<%= fields_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>
		<%= f.text_field :firstname, autofocus: true, :placeholder => "First Name" %>
		<%= f.email_field :email, autofocus: true, :placeholder => "Email Address" %>
		<%= f.hidden_field :gender, :value => "male" %>
	<% end %>