Remove usage of Struct in README

README.md

@@ -54,21 +54,8 @@ class PostPolicy
 end
 ```
 
-As you can see, this is just a plain Ruby class. As a convenience, we can inherit
-from Struct or use Struct.new to define the policy class:
-
-``` ruby
-class PostPolicy < Struct.new(:user, :post)
-  def update?
-    user.admin? or not post.published?
-  end
-end
-```
-
-You could also use the convenient
-[attr_extras](https://github.com/barsoom/attr_extras) gem.
-
-Pundit makes the following assumptions about this class:
+As you can see, this is just a plain Ruby class. Pundit makes the following 
+assumptions about this class:
 
 - The class has the same name as some kind of model class, only suffixed
   with the word "Policy".
@@ -82,6 +69,17 @@ Pundit makes the following assumptions about this class:
 
 That's it really.
 
+Usually you'll want to inherit from the application policy created by the 
+generator, or set up your own base class to inherit from:
+
+``` ruby
+class PostPolicy < ApplicationPolicy
+  def update?
+    user.admin? or not post.published?
+  end
+end
+```
+
 Supposing that you have an instance of class `Post`, Pundit now lets you do
 this in your controller:
 
@@ -161,8 +159,15 @@ particular user has access to. When using Pundit, you are expected to
 define a class called a policy scope. It can look something like this:
 
 ``` ruby
-class PostPolicy < Struct.new(:user, :post)
-  class Scope < Struct.new(:user, :scope)
+class PostPolicy < ApplicationPolicy
+  class Scope
+    attr_reader :user, :scope
+    
+    def initialize(user, scope)
+      @user = user
+      @scope = scope
+    end
+    
     def resolve
       if user.admin?
         scope.all
@@ -190,6 +195,27 @@ Pundit makes the following assumptions about this class:
   some kind of result which can be iterated over. For ActiveRecord classes,
   this would usually be an `ActiveRecord::Relation`.
 
+You'll probably want to inherit from the application policy scope generated by the
+generator, or create your own base class to inherit from:
+
+``` ruby
+class PostPolicy < ApplicationPolicy
+  class Scope < Scope
+    def resolve
+      if user.admin?
+        scope.all
+      else
+        scope.where(:published => true)
+      end
+    end
+  end
+
+  def update?
+    user.admin? or not post.published?
+  end
+end
+```
+
 You can now use this class from your controller via the `policy_scope` method:
 
 ``` ruby