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    <p>To get this particular functionality within CanCan to work, you'll want to store an attribute on your Devise <code>User</code> model that indicates whether a particular user is an admin, or not.</p> <p>Start by creating an attribute on your <code>User</code> table called <code>admin</code>:</p> <pre><code># from command line rails generate migration AddAdminToUser user </code></pre> <p>In the migration, set the default value for the <code>admin</code> attribute to <code>false</code> (or <code>true</code>, depending on what behavior you want enacted by default):</p> <pre><code>class AddAdminToUser &lt; ActiveRecord::Migration def change add_column :users, :admin, :boolean, :default =&gt; true end end </code></pre> <p>Run the migration</p> <pre><code># from command line rake db:migrate </code></pre> <p>In your <code>User</code> model, create a convenience method to access the value of <code>admin</code>:</p> <pre><code># app/models/user.rb def admin? admin end </code></pre> <p>Then, in <code>ability.rb</code>, define the abilities you want to set for each user:</p> <pre><code>class Ability include CanCan::Ability def initialize(user) user ||= User.new # guest user (not logged in) if user.admin? # Admin user can :manage, :all else # Non-admin user can :read, :all end end end </code></pre> <p>Remember – by default, a new <code>User</code> is <em>not</em> an admin. You can always enable admin privileges on an existing user in the following manner:</p> <pre><code># from the Rails console user = User.find(some_number) user.update_attribute(:admin, true) </code></pre>
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    1. POhow to make admin users using devise and cancan?
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    1. COHi, Thank you very much! Just a question. why do you say add_column :user if user already exist because of user.rb? why not add_column :admin ?
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    2. CORead the whole line: you're adding `admin` __to__ the `user` table.
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    3. COI see user is table admin is column.
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