Cannot access "Current user" in rails - ruby-on-rails

Question

I am using devise and devise_ldap for my rails authentication. I am trying to use the built in helper, current user to display the users email on the welcome page of my application.
This is the code that I have tried to use to:
<% if user_signed_in? %>
<div>Signed in as... <%= current_user.email %></div>
<% end %>
when I sign in to the application, I get the error;
undefined method `email' for nil:NilClass
Here is my routes.rb
Rails.application.routes.draw do
devise_for :users
resources :users
resources :systems do
member do
get :targets, :sources
end
root 'systems#index'
end
and my users controller:
class UsersController < ApplicationController
authorize_resource
before_action :set_user, only: [:show, :edit, :update, :destroy]
# GET /users
def index
#users = User.all.order("display_name asc")
end
# GET /users/1
def show
end
# GET /users/new
def new
#user = User.new
end
# GET /stories/1/edit
def edit
respond_to do |format|
format.html
format.js
end
end
# POST /stories
def create
#user = User.new(user_params)
respond_to do |format|
puts 'user controller'
if #user.save!
format.html { redirect_to user_path(#user), notice: 'User was successfully created.' }
else
format.html { render :new }
end
end
end
# PATCH/PUT /stories/1
def update
respond_to do |format|
if #user.update(user_params)
format.html { redirect_to user_path(#user), notice: 'User was successfully updated.' }
else
format.html { render :edit }
end
end
end
# DELETE /stories/1
def destroy
#user.destroy
respond_to do |format|
format.html { redirect_to users_path notice: 'User was successfully destroyed.' }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_user
#user = User.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def user_params
params.require(:user).permit(:display_name, :email, :username)
end
end
my users model:
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
before_create :rememberable_value
before_save :get_ldap_values
devise :ldap_authenticatable, :rememberable, :trackable, :validatable
def get_ldap_values
if self.username
self.email = Devise::LDAP::Adapter.get_ldap_param(self.username,"mail").first if Devise::LDAP::Adapter.get_ldap_param(self.username,"mail")
self.display_name = Devise::LDAP::Adapter.get_ldap_param(self.username,"displayName").first if Devise::LDAP::Adapter.get_ldap_param(self.username,"displayName")
end
end
# def role?(role)
# return !!self.roles.find_by_name(role.to_s.camelize)
# end
def email_required?
false
end
def email_changed?
false
end
def rememberable_value
self.remember_token ||= Devise.friendly_token
end
def name_to_display
if self.display_name
self.display_name
else
self.username
end
end
def password_required?
false
end
def password_match?
self.errors[:password] << "can't be blank" if password.blank?
self.errors[:password_confirmation] << "can't be blank" if password_confirmation.blank?
self.errors[:password_confirmation] << "does not match password" if password != password_confirmation
password == password_confirmation && !password.blank?
end
end
I am not sure what I am missing to be able to access the current users information after a successful sign in.
Update
Here is the new routes file:
Rails.application.routes.draw do
devise_scope :user do
get '/users/sign_out' => 'devise/sessions#destroy'
get "/users/sign_in" => "devise/sessions#new"
# delete "/logout" => "devise/sessions#destroy"
end
devise_for :users
authenticate(:user) do
resources :users
resources :reports
resources :change_logs, only: [:index, :show]
resources :systems do
member do
get :targets, :sources
end
resources :change_logs, module: :systems
resources :components do
resources :change_logs, module: :components
end
resources :c_relations
end
resources :integrations
get '/static_pages/home' # => 'static_pages#home', as: 'home'
root 'systems#index'
end

Answer 1

In routes.rb you should enclose the rows following
devise_for :users
in a block
authenticate(:user) do
resources :users
[...]
end

Answer 2

The problem was that I had overridden the devise mapping and current_user. I removed them and was able to access current user in my views.

Answer 3

Do you have before_action :authenticate_user! in your controller chain at all?
Current_user could be nil after signin is if you aren't asking devise to authenticate the action.