Creates admin page and model.

app/controllers/admin_controller.rb

@@ -0,0 +1,21 @@
+class AdminController < ApplicationController
+  def index
+      logger.debug "current_user:"
+      logger.debug current_user
+    return if admin_only!
+
+    @admin = admin_info
+  end
+
+  def update
+    logger.debug session
+      logger.debug "current_user:"
+      logger.debug current_user
+    return if admin_only!
+
+    admin_info.multiuser = (params["multiuser"] == "on")
+    admin_info.save
+
+    redirect_to root_path
+  end
+end

app/models/admin.rb

@@ -0,0 +1,12 @@
+# The Admin model contains system settings.
+
+class Admin
+  include MongoMapper::Document
+
+  # Whether or not user accounts can be created
+  key :multiuser, Boolean
+
+  def can_create_user?
+    return !(User.count > 0 && !self.multiuser)
+  end
+end

app/views/admin/index.haml

@@ -0,0 +1,18 @@
+- title("Admin")
+- content_for :title do
+  = "Admin"
+
+%h1
+  Administration
+
+%h2
+  User Accounts
+
+= form_for @admin, :url => "/admin", :html => {:name => "admin_form", :id => "admin-form", :class => "admin-form"} do |f| 
+  %label{:for => :multiuser}
+    Allow New Accounts
+    %input{:type => :checkbox, :name => :multiuser, :id => :multiuser, :checked => @admin.multiuser}
+
+  %br
+
+  %input{:type => :submit, :value => :save}