devise_parameter_sanitizer.for(:sign_up) do |u|
  u.permit(:full_name, :email, :password, :password_confirmation)
end
devise_parameter_sanitizer.for(:account_update) do |u|
  u.permit(:full_name, :email, :password, :password_confirmation)
end

devise_parameter_sanitizer.for(:sign_up, &your_method)
devise_parameter_sanitizer.for(:account_update, &your_method)

def your_method
  Proc.new { |u| u.permit(:full_name, :email, :password, :password_confirmation) }
end