Extend NotAuthorizedError with policy, record and query

lib/pundit.rb

@@ -5,7 +5,9 @@
 require "active_support/core_ext/object/blank"
 
 module Pundit
-  class NotAuthorizedError < StandardError; end
+  class NotAuthorizedError < StandardError
+    attr_accessor :policy, :record, :query
+  end
   class NotDefinedError < StandardError; end
 
   extend ActiveSupport::Concern
@@ -56,7 +58,9 @@ def authorize(record, query=nil)
     query ||= params[:action].to_s + "?"
     @_policy_authorized = true
     unless policy(record).public_send(query)
-      raise NotAuthorizedError, "not allowed to #{query} this #{record}"
+      e = NotAuthorizedError.new
+      e.policy, e.record, e.query = policy(record), record, query
+      raise e, "not allowed to #{query} this #{record}"
     end
     true
   end

spec/pundit_spec.rb

@@ -224,6 +224,15 @@ def destroy?
     it "raises an error when the permission check fails" do
       expect { controller.authorize(Post.new) }.to raise_error(Pundit::NotAuthorizedError)
     end
+
+    it "raises an error with a policy, record and query" do
+      expect { controller.authorize(post, :destroy?) }.to raise_error do |error|
+        expect(error.policy).to eq controller.policy(post)
+        expect(error.record).to eq post
+        expect(error.query).to eq :destroy?
+        expect(error.message).to eq "not allowed to #{error.query} this #{error.record}"
+      end
+    end
   end
 
   describe "#pundit_user" do