undefined method `current_user?' error - ruby-on-rails-4

Question

New to Rails and trying to figure out why I'm getting the above error message when I try to view my index properties page. I'm using Devise and CanCanCan. Code is below. Please let me know if something missing that would help identify problem.
View:
<% #properties.each do |property| %>
<div class = "row for-sale-header">
<div class="col-xs-8">
<% if user_signed_in? && current_user? %>
<%= link_to edit_property_path(property) do %>
<i class="glyphicon glyphicon-edit" aria-hidden="true"></i> Edit
<% end %><br />
<% end %>
<h5>Property ID: <%= property.id %> <br /> </h5>
<%= property.description %>
</div>
</div>
<br />
<% end %>
Controller:
class PropertiesController < ApplicationController
before_action :authenticate_user!, except: [:index]
before_action :set_user, only: [:show, :edit, :update]
def index
#properties = Property.all
end
def new
#property = current_user.properties.new
end
def create
#property = current_user.properties.new(property_params)
respond_to do |format|
if #property.save
format.html { redirect_to #property, notice: "Property was successfully created." }
format.json { render :show, location: #property }
else
format.html { render :new }
format.json
end
end
end
def update
respond_to do |format|
if #property.update(property_params)
format.html { redirect_to #property, notice: "You've successfully updated your property listing!" }
format.json { render :show, status: :ok, location: #property }
else
format.html { render :edit }
format.json { render json: #property.errors, status: :unprocessable_entity }
end
end
end
private
def property_params
params.require(:property).permit(:street, :city, :province, :postal_code, :description, :picture)
end
def set_user
#property = Property.find(params[:id])
end
end
Application Controller:
class ApplicationController < ActionController::Base
# Prevent CSRF attacks by raising an exception.
# For APIs, you may want to use :null_session instead.
protect_from_forgery with: :exception
before_action :configure_permitted_parameters, if:
:devise_controller?
protected
def configure_permitted_parameters
devise_parameter_sanitizer.for(:sign_up) << :name
end
end
I thought current_user could be used anywhere in the app based on Devise documentation on using it as a helper.

Answer 1

current_user can be used any where in the app. current_user? is not a method provided by Devise.