Refactoring 'if' statements in RubyFreelancers

application.haml

/ Before refactoring
#freelancer_nav
  - if freelancer_signed_in?
    = link_to "Dashboard", '/freelancers/dashboard'
    - if current_freelancer.profile.nil?
      = link_to "New Profile", new_profile_path
    - else
      = link_to "My Profile", current_freelancer.profile
      = link_to "Sign out", destroy_freelancer_session_path
  - elsif admin_signed_in?
    = link_to "Dashboard", admin_root_path
    = link_to "Sign out", destroy_admin_session_path
  - elsif employer_signed_in?
    - if current_employer.profile.nil?
      = link_to "New Profile", new_profile_path
  - else
    = link_to "Admin Login", new_admin_session_path
    = link_to "Freelancer Login", new_freelancer_session_path
    = link_to "be a freelancer", new_freelancer_registration_path
    = link_to "be an employer", new_employer_registration_path

/ After refactoring
#freelancer_nav
  - if current_user
    = render :partial => "#{current_user_model}/nav"
  - else
    = link_to "Admin Login", new_admin_session_path
    = link_to "Freelancer Login", new_freelancer_session_path
    = link_to "be a freelancer", new_freelancer_registration_path
    = link_to "be an employer", new_employer_registration_path

application_helper.rb

module ApplicationHelper
  def current_user
    if current_freelancer
      return current_freelancer
    elsif current_employer
      return current_employer
    elsif current_admin
      return current_admin
    else
      return nil
    end
  end

  def current_user_model
    current_user_class = current_user.class.to_s
    return current_user_class.downcase.pluralize
  end
end

gistfile3.haml

/ Admins nav partial
= link_to "Dashboard", admin_root_path
= link_to "Sign out", destroy_admin_session_path

/ Freelancers nav partial
= link_to "Dashboard", freelancer_root_path
- if current_freelancer.profile.nil?
  = link_to "New Profile", new_profile_path
- else
  = link_to "My Profile", current_freelancer.profile
= link_to "Sign out", destroy_freelancer_session_path

/ Employers nav partial
= link_to "Dashboard", employer_root_path
- if current_employer.profile.nil?
  = link_to "New Profile", new_profile_path
- else
  = link_to "My Profile", current_employer.profile
= link_to "Sign out", destroy_employer_session_path