finalize the serializing example

t/example.t

@@ -64,6 +64,7 @@ $registry->add_type(
         relationships => {
             'tags'     => { type => 'tag' },
             'comments' => { type => 'comment' },
+            photos     => { type => 'photo' },
             author     => {
                 type  => "people",
                 links => sub ( $data, @ ) {
@@ -80,16 +81,24 @@ $registry->add_type(
 );
 
 $registry->add_type('tag');
+$registry->add_type('photo');
 $registry->add_type( 'comment',
     { id => '_id', allowed_attributes => ['body'] } );
 $registry->add_type(
     'people',
-    {   links => sub ( $data, @ ) { '/peoples/' . $data->{id} }
+    {   links => sub ( $data, @ ) { +{ self => '/peoples/' . $data->{id} } }
     }
 );
 
 my $output = $registry->serialize( 'article', $data, { count => 2 } );
 
+like $output->{data}[0]{relationships}{author},
+  { links => {
+        "self"    => "/articles/1/relationships/author",
+        "related" => "/articles/1/author"
+    }
+  };
+
 like $output->{data}[0]{relationships}{author},
   { links => {
         "self"    => "/articles/1/relationships/author",
@@ -113,6 +122,16 @@ like $output => {
                 "created" => "2015-05-22T14:56:29.000Z"
             },
             "relationships" => {
+                "author" => {
+                    "data" => {
+                        "type" => "people",
+                        "id"   => "1"
+                    },
+                    "links" => {
+                        "self"    => "/articles/1/relationships/author",
+                        "related" => "/articles/1/author"
+                    }
+                },
                 "tags" => {
                     "data" => [
                         {   "type" => "tag",
@@ -123,9 +142,74 @@ like $output => {
                         }
                     ]
                 },
+                "photos" => {
+                    "data" => [
+                        {   "type" => "photo",
+                            "id"   => "ed70cf44-9a34-4878-84e6-0c0e4a450cfe"
+                        },
+                        {   "type" => "photo",
+                            "id"   => "24ba3666-a593-498c-9f5d-55a4ee08c72e"
+                        },
+                        {   "type" => "photo",
+                            "id"   => "f386492d-df61-4573-b4e3-54f6f5d08acf"
                         }
+                    ]
+                },
+                "comments" => {
+                    "data" => [
+                        {   "type" => "comment",
+                            "id"   => "1"
+                        },
+                        {   "type" => "comment",
+                            "id"   => "2"
+                        },
+                        {   "type" => "comment",
+                            "id"   => "3"
+                        }
+                    ]
+                }
+            },
+            "links" => { "self" => "/articles/1" }
         }
     ],
 };
 
+is $output->{included}, bag {
+    item($_)
+      for (
+        {   "type"       => "people",
+            "id"         => "1",
+            "attributes" => {
+                "firstName" => "Kaley",
+                "lastName"  => "Maggio",
+                "email"     => "Kaley-Maggio\@example.com",
+                "age"       => "80",
+                "gender"    => "male"
+            },
+            "links" => { "self" => "/peoples/1" },
+        },
+        {   "type"       => "comment",
+            "id"         => "1",
+            "attributes" => { "body" => "First !" }
+        },
+        {   "type"       => "comment",
+            "id"         => "2",
+            "attributes" => { "body" => "I Like !" }
+        },
+        {   "type"       => "comment",
+            "id"         => "3",
+            "attributes" => { "body" => "Awesome" }
+        }
+      );
+};
+
+subtest 'comments only have the body attribute' => sub {
+    for
+      my $comment ( grep { $_->{type} eq 'comment' } $output->{included}->@* )
+    {
+        my @attr = keys $comment->{attributes}->%*;
+        is( \@attr => ['body'], "only the body for comments" );
+    }
+};
+
 done_testing;