Added a selector for users role in admin cp

app/models/user.rb

@@ -15,7 +15,7 @@ class User < ActiveRecord::Base
   validates :username, :presence => true, :uniqueness => true
 
   # Setup accessible (or protected) attributes for your model
-  attr_accessible :username, :email, :password, :password_confirmation, :remember_me, :is_admin
+  attr_accessible :username, :email, :password, :password_confirmation, :remember_me, :role_id
   
   has_many :topics, :dependent => :destroy
   has_many :posts, :dependent => :destroy

app/views/users/_form.html.erb

@@ -14,9 +14,9 @@
   <%= f.label :username %>
   <%= f.text_field :username %>
 
-  <p> 
-   Administrator &nbsp;  <%= f.check_box :is_admin, {checked: @user.admin?} %>
-  </p>
+  <br/>
+
+  <%= collection_select(:user, :role_id, Role.all, :id, :name) %> 
 
   <%= f.label :email %>
   <%= f.email_field :email %>