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PODisplay an Index of Admin Users in Ruby on Rails
 

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  1. PODisplay an Index of Admin Users in Ruby on Rails
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    <p>I've completed the Michael Hartl Ruby on Rails Tutorial (for Rails 3) and I am wondering how you would go about displaying all the users that have been assigned the Admin attribute but on a separate page as it doesn't mention this anywhere.</p> <p><strong>users_controller.rb</strong></p> <pre><code> class UsersController &lt; ApplicationController before_filter :authenticate, :only =&gt; [:index, :edit, :update, :destroy] before_filter :correct_user, :only =&gt; [:edit, :update] before_filter :admin_user, :only =&gt; :destroy def show @user = User.find(params[:id]) @microposts = @user.microposts.paginate(:page =&gt; params[:page]) @title = @user.name end def new @user = User.new @title = "Sign up" end def create @user = User.new(params[:user]) if @user.save sign_in @user flash[:success] = "Welcome to University Sports!" redirect_to @user else @title = "Sign up" render 'new' end end def edit @title = "Edit user" end def update @user = User.find(params[:id]) if @user.update_attributes(params[:user]) flash[:success] = "Profile updated." redirect_to @user else @title = "Edit user" render 'edit' end end def index @users = User.paginate(:page =&gt; params[:page]) end def admins @users = User.admins render "users/index" end def destroy User.find(params[:id]).destroy flash[:success] = "User destroyed." redirect_to users_path end def following @title = "Following" @user = User.find(params[:id]) @users = @user.following.paginate(:page =&gt; params[:page]) render 'show_follow' end def followers @title = "Followers" @user = User.find(params[:id]) @users = @user.followers.paginate(:page =&gt; params[:page]) render 'show_follow' end private def authenticate deny_access unless signed_in? end def correct_user @user = User.find(params[:id]) redirect_to(root_path) unless current_user?(@user) end def admin_user redirect_to(root_path) unless current_user.admin? end end </code></pre> <p><strong>Routes.rb</strong></p> <pre><code>FinalProject::Application.routes.draw do get "club/new" resources :users do member do get :following, :followers end end resources :users do collection do get :admins end end resources :sessions, :only =&gt; [:new, :create, :destroy] resources :microposts, :only =&gt; [:create, :destroy] resources :relationships, :only =&gt; [:create, :destroy] get "sessions/new" match '/signup', :to =&gt; 'users#new' match '/signin', :to =&gt; 'sessions#new' match '/signout', :to =&gt; 'sessions#destroy' match '/sign_up', :to =&gt; 'pages#sign_up' root :to =&gt; 'pages#home' resources :users match '/signup', :to =&gt; 'users#new' end </code></pre> <p><strong>user.rb</strong></p> <pre><code>class User &lt; ActiveRecord::Base attr_accessor :password attr_accessible :name, :email, :password, :password_confirmation has_many :microposts, :dependent =&gt; :destroy has_many :relationships, :foreign_key =&gt; "follower_id", :dependent =&gt; :destroy has_many :following, :through =&gt; :relationships, :source =&gt; :followed has_many :reverse_relationships, :foreign_key =&gt; "followed_id", :class_name =&gt; "Relationship", :dependent =&gt; :destroy has_many :followers, :through =&gt; :reverse_relationships, :source =&gt; :follower email_regex = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i validates :name, :presence =&gt; true, :length =&gt; { :maximum =&gt; 50 } validates :email, :presence =&gt; true, :format =&gt; { :with =&gt; email_regex }, :uniqueness =&gt; { :case_sensitive =&gt; false } scope :admins, where(:admin =&gt; true) # Automatically create the virtual attribute 'password_confirmation'. validates :password, :presence =&gt; true, :confirmation =&gt; true, :length =&gt; { :within =&gt; 6..40 } before_save :encrypt_password def has_password?(submitted_password) encrypted_password == encrypt(submitted_password) end def self.authenticate(email, submitted_password) user = find_by_email(email) return nil if user.nil? return user if user.has_password?(submitted_password) end def self.authenticate_with_salt(id, cookie_salt) user = find_by_id(id) (user &amp;&amp; user.salt == cookie_salt) ? user : nil end def following?(followed) relationships.find_by_followed_id(followed) end def follow!(followed) relationships.create!(:followed_id =&gt; followed.id) end def unfollow!(followed) relationships.find_by_followed_id(followed).destroy end def feed Micropost.from_users_followed_by(self) end private def encrypt_password self.salt = make_salt unless has_password?(password) self.encrypted_password = encrypt(password) end def encrypt(string) secure_hash("#{salt}--#{string}") end def make_salt secure_hash("#{Time.now.utc}--#{password}") end def secure_hash(string) Digest::SHA2.hexdigest(string) end end </code></pre>
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