add 4th paginate option to display all users

app/controllers/users_controller.rb

@@ -249,7 +249,7 @@ def role
 
   # For filtering the users list with proper search and pagination.
   def paginate_list
-    paginate_options = { '1' => 25, '2' => 50, '3' => 100 }
+    paginate_options = { '1' => 25, '2' => 50, '3' => 100, '4' => User.count}
 
     # If the above hash does not have a value for the key,
     # it means that we need to show all the users on the page
@@ -259,7 +259,7 @@ def paginate_list
 
     # The type of condition for the search depends on what the user has selected from the search_by dropdown
     @search_by = params[:search_by]
-    @per_page = 3
+    @per_page = 4
     # search for corresponding users
     # users = User.search_users(role, user_id, letter, @search_by)