From a875be9e7cc4b8f646877ce1f3027627a3e0705d Mon Sep 17 00:00:00 2001
From: Alexey Karapetov <karapetov@gmail.com>
Date: Sat, 23 Feb 2019 11:56:37 -0800
Subject: [PATCH 1/7] Relationship with no "data" member. Fixed #92

---
 phpunit.xml.dist                    |  3 +-
 src/EmptyRelationship.php           | 31 +++++++++++++++
 src/Internal/RelationshipMember.php | 11 ++++++
 src/Internal/ToManyMember.php       |  5 ++-
 src/Link/RelatedLink.php            |  4 +-
 src/Link/SelfLink.php               |  4 +-
 src/Meta.php                        |  4 +-
 src/ToMany.php                      |  6 +--
 test/ResourceObjectTest.php         | 59 +++++++++++++++++++++++++++++
 9 files changed, 117 insertions(+), 10 deletions(-)
 create mode 100644 src/EmptyRelationship.php
 create mode 100644 src/Internal/RelationshipMember.php

diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 48bfa68..884a29a 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -3,8 +3,7 @@
         bootstrap="vendor/autoload.php"
         stopOnFailure="false"
         verbose="true"
-        colors="true"
-        syntaxCheck="true">
+        colors="true">
     <testsuites>
         <testsuite name="Main">
             <directory>./test</directory>
diff --git a/src/EmptyRelationship.php b/src/EmptyRelationship.php
new file mode 100644
index 0000000..666e47d
--- /dev/null
+++ b/src/EmptyRelationship.php
@@ -0,0 +1,31 @@
+<?php declare(strict_types=1);
+
+namespace JsonApiPhp\JsonApi;
+
+use JsonApiPhp\JsonApi\Internal\RelationshipMember;
+use JsonApiPhp\JsonApi\Internal\ResourceField;
+use JsonApiPhp\JsonApi\Internal\ResourceFieldTrait;
+
+/**
+ * A relationship with no data
+ */
+class EmptyRelationship implements ResourceField
+{
+    use ResourceFieldTrait;
+
+    private $obj;
+
+    public function __construct(string $name, RelationshipMember $member, RelationshipMember ...$members)
+    {
+        $this->name = $name;
+        $this->obj = combine($member, ...$members);
+    }
+
+    /**
+     * @param object $o
+     */
+    public function attachTo($o): void
+    {
+        child($o, 'relationships')->{$this->name} = $this->obj;
+    }
+}
\ No newline at end of file
diff --git a/src/Internal/RelationshipMember.php b/src/Internal/RelationshipMember.php
new file mode 100644
index 0000000..ca5fc49
--- /dev/null
+++ b/src/Internal/RelationshipMember.php
@@ -0,0 +1,11 @@
+<?php declare(strict_types=1);
+
+namespace JsonApiPhp\JsonApi\Internal;
+
+/**
+ * @internal
+ */
+interface RelationshipMember extends ToOneMember, ToManyMember
+{
+
+}
\ No newline at end of file
diff --git a/src/Internal/ToManyMember.php b/src/Internal/ToManyMember.php
index 52dd2f7..d812f11 100644
--- a/src/Internal/ToManyMember.php
+++ b/src/Internal/ToManyMember.php
@@ -2,6 +2,9 @@
 
 namespace JsonApiPhp\JsonApi\Internal;
 
-interface ToManyMember extends ToOneMember
+/**
+ * @internal
+ */
+interface ToManyMember extends Attachable
 {
 }
diff --git a/src/Link/RelatedLink.php b/src/Link/RelatedLink.php
index 70ddc34..cfa3fab 100644
--- a/src/Link/RelatedLink.php
+++ b/src/Link/RelatedLink.php
@@ -3,10 +3,10 @@
 namespace JsonApiPhp\JsonApi\Link;
 
 use JsonApiPhp\JsonApi\Internal\LinkTrait;
-use JsonApiPhp\JsonApi\Internal\ToOneMember;
 use function JsonApiPhp\JsonApi\child;
+use JsonApiPhp\JsonApi\Internal\RelationshipMember;
 
-final class RelatedLink implements ToOneMember
+final class RelatedLink implements RelationshipMember
 {
     use LinkTrait;
 
diff --git a/src/Link/SelfLink.php b/src/Link/SelfLink.php
index f886435..b70ac65 100644
--- a/src/Link/SelfLink.php
+++ b/src/Link/SelfLink.php
@@ -4,11 +4,13 @@
 
 use JsonApiPhp\JsonApi\Internal\DataDocumentMember;
 use JsonApiPhp\JsonApi\Internal\LinkTrait;
+use JsonApiPhp\JsonApi\Internal\RelationshipMember;
 use JsonApiPhp\JsonApi\Internal\ResourceMember;
+use JsonApiPhp\JsonApi\Internal\ToManyMember;
 use JsonApiPhp\JsonApi\Internal\ToOneMember;
 use function JsonApiPhp\JsonApi\child;
 
-final class SelfLink implements DataDocumentMember, ResourceMember, ToOneMember
+final class SelfLink implements DataDocumentMember, ResourceMember, RelationshipMember
 {
     use LinkTrait;
 
diff --git a/src/Meta.php b/src/Meta.php
index a267bdb..cb96139 100644
--- a/src/Meta.php
+++ b/src/Meta.php
@@ -6,10 +6,12 @@
 use JsonApiPhp\JsonApi\Internal\ErrorDocumentMember;
 use JsonApiPhp\JsonApi\Internal\ErrorMember;
 use JsonApiPhp\JsonApi\Internal\MetaDocumentMember;
+use JsonApiPhp\JsonApi\Internal\RelationshipMember;
 use JsonApiPhp\JsonApi\Internal\ResourceMember;
+use JsonApiPhp\JsonApi\Internal\ToManyMember;
 use JsonApiPhp\JsonApi\Internal\ToOneMember;
 
-final class Meta implements ErrorMember, ErrorDocumentMember, MetaDocumentMember, DataDocumentMember, ResourceMember, ToOneMember
+final class Meta implements ErrorMember, ErrorDocumentMember, MetaDocumentMember, DataDocumentMember, ResourceMember, RelationshipMember
 {
     /**
      * @var string
diff --git a/src/ToMany.php b/src/ToMany.php
index e4227eb..0811006 100644
--- a/src/ToMany.php
+++ b/src/ToMany.php
@@ -5,13 +5,13 @@
 use JsonApiPhp\JsonApi\Internal\Identifier;
 use JsonApiPhp\JsonApi\Internal\ResourceField;
 use JsonApiPhp\JsonApi\Internal\ResourceFieldTrait;
-use JsonApiPhp\JsonApi\Internal\ToOneMember;
+use JsonApiPhp\JsonApi\Internal\ToManyMember;
 
 final class ToMany implements Identifier, ResourceField
 {
     use ResourceFieldTrait;
     /**
-     * @var ToOneMember[]
+     * @var ToManyMember[]
      */
     private $members;
     /**
@@ -19,7 +19,7 @@ final class ToMany implements Identifier, ResourceField
      */
     private $collection;
 
-    public function __construct(string $name, ResourceIdentifierCollection $collection, ToOneMember ...$members)
+    public function __construct(string $name, ResourceIdentifierCollection $collection, ToManyMember ...$members)
     {
         $this->validateFieldName($name);
         $this->name = $name;
diff --git a/test/ResourceObjectTest.php b/test/ResourceObjectTest.php
index 37e845f..540a6ea 100644
--- a/test/ResourceObjectTest.php
+++ b/test/ResourceObjectTest.php
@@ -4,6 +4,7 @@
 
 use JsonApiPhp\JsonApi\Attribute;
 use JsonApiPhp\JsonApi\DataDocument;
+use JsonApiPhp\JsonApi\EmptyRelationship;
 use JsonApiPhp\JsonApi\Link\RelatedLink;
 use JsonApiPhp\JsonApi\Link\SelfLink;
 use JsonApiPhp\JsonApi\Meta;
@@ -13,6 +14,7 @@
 use JsonApiPhp\JsonApi\ToMany;
 use JsonApiPhp\JsonApi\ToNull;
 use JsonApiPhp\JsonApi\ToOne;
+use PhpCsFixer\Fixer\Casing\LowercaseKeywordsFixer;
 
 class ResourceObjectTest extends BaseTestCase
 {
@@ -152,6 +154,63 @@ public function testRelationshipWithEmptyMultiIdLinkage()
         );
     }
 
+    public function testRelationshipWithNoData()
+    {
+        $this->assertEncodesTo(
+            '
+            {
+                "data": {
+                    "type": "basket",
+                    "id": "1",
+                    "relationships": {
+                        "empty": {
+                            "links": {
+                                "related": "/foo"
+                            }
+                        }
+                    }
+                }
+            }
+            ',
+            new DataDocument(
+                new ResourceObject(
+                    'basket',
+                    '1',
+                    new EmptyRelationship('empty', new RelatedLink('/foo'))
+                )
+            )
+        );
+
+        $this->assertEncodesTo(
+            '
+            {
+                "data": {
+                    "type": "basket",
+                    "id": "1",
+                    "relationships": {
+                        "empty": {
+                            "links": {
+                                "related": "/foo",
+                                "self": "/bar"
+                            },
+                            "meta": {
+                                "foo": "bar"
+                            }
+                        }
+                    }
+                }
+            }
+            ',
+            new DataDocument(
+                new ResourceObject(
+                    'basket',
+                    '1',
+                    new EmptyRelationship('empty', new RelatedLink('/foo'), new SelfLink('/bar'), new Meta('foo', 'bar'))
+                )
+            )
+        );
+    }
+
     public function testCanNotCreateIdAttribute()
     {
         $this->expectException(\DomainException::class);

From cff881a31393eb6a923839cf91f2658062daef6e Mon Sep 17 00:00:00 2001
From: Alexey Karapetov <karapetov@gmail.com>
Date: Sat, 23 Feb 2019 12:00:31 -0800
Subject: [PATCH 2/7] Add php 7.2 and 7.3 to Travis

---
 .travis.yml                     | 2 ++
 src/Error.php                   | 2 +-
 src/ErrorDocument.php           | 2 +-
 src/Included.php                | 2 +-
 src/Internal/LinkTrait.php      | 2 +-
 src/JsonApi.php                 | 2 +-
 src/Link/RelatedLink.php        | 2 +-
 src/Link/SelfLink.php           | 2 --
 src/Meta.php                    | 2 --
 src/ResourceIdentifier.php      | 2 +-
 src/ResourceObject.php          | 2 +-
 src/functions.php               | 4 ++--
 test/ExamplesTest.php           | 4 ++--
 test/ResourceObjectTest.php     | 1 -
 test/benchmarks/compound10k.php | 2 +-
 15 files changed, 15 insertions(+), 18 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 8ba1558..fe3c026 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
 language: php
 php:
   - '7.1'
+  - '7.2'
+  - '7.3'
 
 before_script:
   - composer install
diff --git a/src/Error.php b/src/Error.php
index 35b7b8d..8e53e25 100644
--- a/src/Error.php
+++ b/src/Error.php
@@ -15,7 +15,7 @@ final class Error implements ErrorDocumentMember
 
     public function __construct(ErrorMember ...$members)
     {
-        $this->error = (object) [];
+        $this->error = (object)[];
         foreach ($members as $member) {
             $member->attachTo($this->error);
         }
diff --git a/src/ErrorDocument.php b/src/ErrorDocument.php
index e4a52e5..dd69238 100644
--- a/src/ErrorDocument.php
+++ b/src/ErrorDocument.php
@@ -14,7 +14,7 @@ final class ErrorDocument implements \JsonSerializable
 
     public function __construct(Error $error, ErrorDocumentMember ...$members)
     {
-        $this->obj = (object) [];
+        $this->obj = (object)[];
         $error->attachTo($this->obj);
         foreach ($members as $member) {
             $member->attachTo($this->obj);
diff --git a/src/Included.php b/src/Included.php
index 220270b..cf34e17 100644
--- a/src/Included.php
+++ b/src/Included.php
@@ -34,7 +34,7 @@ public function validateLinkage(PrimaryData $data): void
             if (isset($registry[$resource->key()]) || isset($this->identifiers[$resource->key()])) {
                 continue;
             }
-            throw new \LogicException('Full linkage required for '.$resource);
+            throw new \LogicException('Full linkage required for ' . $resource);
         }
     }
 
diff --git a/src/Internal/LinkTrait.php b/src/Internal/LinkTrait.php
index 006c61a..6aeb4a1 100644
--- a/src/Internal/LinkTrait.php
+++ b/src/Internal/LinkTrait.php
@@ -17,7 +17,7 @@ trait LinkTrait
     public function __construct(string $url, Meta ...$metas)
     {
         if ($metas) {
-            $this->link = (object) ['href' => $url];
+            $this->link = (object)['href' => $url];
             foreach ($metas as $meta) {
                 $meta->attachTo($this->link);
             }
diff --git a/src/JsonApi.php b/src/JsonApi.php
index c895bb6..8958c5d 100644
--- a/src/JsonApi.php
+++ b/src/JsonApi.php
@@ -12,7 +12,7 @@ final class JsonApi implements MetaDocumentMember, DataDocumentMember, ErrorDocu
 
     public function __construct(string $version = '1.0', Meta $meta = null)
     {
-        $this->obj = (object) [
+        $this->obj = (object)[
             'version' => $version,
         ];
         if ($meta) {
diff --git a/src/Link/RelatedLink.php b/src/Link/RelatedLink.php
index cfa3fab..f9a00e3 100644
--- a/src/Link/RelatedLink.php
+++ b/src/Link/RelatedLink.php
@@ -3,8 +3,8 @@
 namespace JsonApiPhp\JsonApi\Link;
 
 use JsonApiPhp\JsonApi\Internal\LinkTrait;
-use function JsonApiPhp\JsonApi\child;
 use JsonApiPhp\JsonApi\Internal\RelationshipMember;
+use function JsonApiPhp\JsonApi\child;
 
 final class RelatedLink implements RelationshipMember
 {
diff --git a/src/Link/SelfLink.php b/src/Link/SelfLink.php
index b70ac65..4af9299 100644
--- a/src/Link/SelfLink.php
+++ b/src/Link/SelfLink.php
@@ -6,8 +6,6 @@
 use JsonApiPhp\JsonApi\Internal\LinkTrait;
 use JsonApiPhp\JsonApi\Internal\RelationshipMember;
 use JsonApiPhp\JsonApi\Internal\ResourceMember;
-use JsonApiPhp\JsonApi\Internal\ToManyMember;
-use JsonApiPhp\JsonApi\Internal\ToOneMember;
 use function JsonApiPhp\JsonApi\child;
 
 final class SelfLink implements DataDocumentMember, ResourceMember, RelationshipMember
diff --git a/src/Meta.php b/src/Meta.php
index cb96139..5b9a2c3 100644
--- a/src/Meta.php
+++ b/src/Meta.php
@@ -8,8 +8,6 @@
 use JsonApiPhp\JsonApi\Internal\MetaDocumentMember;
 use JsonApiPhp\JsonApi\Internal\RelationshipMember;
 use JsonApiPhp\JsonApi\Internal\ResourceMember;
-use JsonApiPhp\JsonApi\Internal\ToManyMember;
-use JsonApiPhp\JsonApi\Internal\ToOneMember;
 
 final class Meta implements ErrorMember, ErrorDocumentMember, MetaDocumentMember, DataDocumentMember, ResourceMember, RelationshipMember
 {
diff --git a/src/ResourceIdentifier.php b/src/ResourceIdentifier.php
index 6967856..cf1668e 100644
--- a/src/ResourceIdentifier.php
+++ b/src/ResourceIdentifier.php
@@ -22,7 +22,7 @@ public function __construct(string $type, string $id, Meta $meta = null)
             throw new \DomainException("Invalid type value: $type");
         }
 
-        $this->obj = (object) [
+        $this->obj = (object)[
             'type' => $type,
             'id' => $id,
         ];
diff --git a/src/ResourceObject.php b/src/ResourceObject.php
index bab4f25..a494fbd 100644
--- a/src/ResourceObject.php
+++ b/src/ResourceObject.php
@@ -25,7 +25,7 @@ public function __construct(string $type, string $id, ResourceMember ...$members
         if (isValidName($type) === false) {
             throw new \DomainException("Invalid type value: $type");
         }
-        $this->obj = (object) ['type' => $type, 'id' => $id];
+        $this->obj = (object)['type' => $type, 'id' => $id];
         $fields = [];
         foreach ($members as $member) {
             if ($member instanceof Identifier) {
diff --git a/src/functions.php b/src/functions.php
index df50e2d..efd2b23 100644
--- a/src/functions.php
+++ b/src/functions.php
@@ -6,7 +6,7 @@
 
 function combine(Attachable ...$members)
 {
-    $obj = (object) [];
+    $obj = (object)[];
     foreach ($members as $member) {
         $member->attachTo($obj);
     }
@@ -16,7 +16,7 @@ function combine(Attachable ...$members)
 function child($o, string $name)
 {
     if (!isset($o->{$name})) {
-        $o->{$name} = (object) [];
+        $o->{$name} = (object)[];
     }
     return $o->{$name};
 }
diff --git a/test/ExamplesTest.php b/test/ExamplesTest.php
index ba7a1cf..e9a43a8 100644
--- a/test/ExamplesTest.php
+++ b/test/ExamplesTest.php
@@ -19,8 +19,8 @@ public function testOutputEncodesToJson(string $file)
     public function examples()
     {
         return [
-            [__DIR__.'/../examples/compound_doc.php'],
-            [__DIR__.'/../examples/simple_doc.php'],
+            [__DIR__ . '/../examples/compound_doc.php'],
+            [__DIR__ . '/../examples/simple_doc.php'],
         ];
     }
 }
diff --git a/test/ResourceObjectTest.php b/test/ResourceObjectTest.php
index 540a6ea..3541c8d 100644
--- a/test/ResourceObjectTest.php
+++ b/test/ResourceObjectTest.php
@@ -14,7 +14,6 @@
 use JsonApiPhp\JsonApi\ToMany;
 use JsonApiPhp\JsonApi\ToNull;
 use JsonApiPhp\JsonApi\ToOne;
-use PhpCsFixer\Fixer\Casing\LowercaseKeywordsFixer;
 
 class ResourceObjectTest extends BaseTestCase
 {
diff --git a/test/benchmarks/compound10k.php b/test/benchmarks/compound10k.php
index c1a0ae2..0fc6646 100644
--- a/test/benchmarks/compound10k.php
+++ b/test/benchmarks/compound10k.php
@@ -28,7 +28,7 @@
 use JsonApiPhp\JsonApi\ToMany;
 use JsonApiPhp\JsonApi\ToOne;
 
-require_once __DIR__.'/../../vendor/autoload.php';
+require_once __DIR__ . '/../../vendor/autoload.php';
 
 // Generate the compound document from the spec 10k times
 

From 3ce1483dd3c4ea40070fb73f42cb1d535eae5c5b Mon Sep 17 00:00:00 2001
From: Alexey Karapetov <karapetov@gmail.com>
Date: Sat, 23 Feb 2019 12:01:48 -0800
Subject: [PATCH 3/7] Style fix

---
 src/EmptyRelationship.php           | 2 +-
 src/Error.php                       | 2 +-
 src/Error/SourceParameter.php       | 2 +-
 src/Error/SourcePointer.php         | 2 +-
 src/ErrorDocument.php               | 2 +-
 src/Included.php                    | 2 +-
 src/Internal/LinkTrait.php          | 2 +-
 src/Internal/RelationshipMember.php | 3 +--
 src/JsonApi.php                     | 2 +-
 src/Link/AboutLink.php              | 2 +-
 src/Link/FirstLink.php              | 2 +-
 src/Link/LastLink.php               | 2 +-
 src/Link/NextLink.php               | 2 +-
 src/Link/PrevLink.php               | 2 +-
 src/Link/RelatedLink.php            | 2 +-
 src/Link/SelfLink.php               | 2 +-
 src/ResourceIdentifier.php          | 2 +-
 src/ResourceObject.php              | 2 +-
 src/functions.php                   | 4 ++--
 test/ExamplesTest.php               | 4 ++--
 test/benchmarks/compound10k.php     | 2 +-
 21 files changed, 23 insertions(+), 24 deletions(-)

diff --git a/src/EmptyRelationship.php b/src/EmptyRelationship.php
index 666e47d..1482792 100644
--- a/src/EmptyRelationship.php
+++ b/src/EmptyRelationship.php
@@ -28,4 +28,4 @@ public function attachTo($o): void
     {
         child($o, 'relationships')->{$this->name} = $this->obj;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Error.php b/src/Error.php
index 8e53e25..35b7b8d 100644
--- a/src/Error.php
+++ b/src/Error.php
@@ -15,7 +15,7 @@ final class Error implements ErrorDocumentMember
 
     public function __construct(ErrorMember ...$members)
     {
-        $this->error = (object)[];
+        $this->error = (object) [];
         foreach ($members as $member) {
             $member->attachTo($this->error);
         }
diff --git a/src/Error/SourceParameter.php b/src/Error/SourceParameter.php
index 05b711a..f3bc37a 100644
--- a/src/Error/SourceParameter.php
+++ b/src/Error/SourceParameter.php
@@ -2,8 +2,8 @@
 
 namespace JsonApiPhp\JsonApi\Error;
 
-use JsonApiPhp\JsonApi\Internal\ErrorMember;
 use function JsonApiPhp\JsonApi\child;
+use JsonApiPhp\JsonApi\Internal\ErrorMember;
 
 final class SourceParameter implements ErrorMember
 {
diff --git a/src/Error/SourcePointer.php b/src/Error/SourcePointer.php
index 84815db..0af0b5b 100644
--- a/src/Error/SourcePointer.php
+++ b/src/Error/SourcePointer.php
@@ -2,8 +2,8 @@
 
 namespace JsonApiPhp\JsonApi\Error;
 
-use JsonApiPhp\JsonApi\Internal\ErrorMember;
 use function JsonApiPhp\JsonApi\child;
+use JsonApiPhp\JsonApi\Internal\ErrorMember;
 
 final class SourcePointer implements ErrorMember
 {
diff --git a/src/ErrorDocument.php b/src/ErrorDocument.php
index dd69238..e4a52e5 100644
--- a/src/ErrorDocument.php
+++ b/src/ErrorDocument.php
@@ -14,7 +14,7 @@ final class ErrorDocument implements \JsonSerializable
 
     public function __construct(Error $error, ErrorDocumentMember ...$members)
     {
-        $this->obj = (object)[];
+        $this->obj = (object) [];
         $error->attachTo($this->obj);
         foreach ($members as $member) {
             $member->attachTo($this->obj);
diff --git a/src/Included.php b/src/Included.php
index cf34e17..220270b 100644
--- a/src/Included.php
+++ b/src/Included.php
@@ -34,7 +34,7 @@ public function validateLinkage(PrimaryData $data): void
             if (isset($registry[$resource->key()]) || isset($this->identifiers[$resource->key()])) {
                 continue;
             }
-            throw new \LogicException('Full linkage required for ' . $resource);
+            throw new \LogicException('Full linkage required for '.$resource);
         }
     }
 
diff --git a/src/Internal/LinkTrait.php b/src/Internal/LinkTrait.php
index 6aeb4a1..006c61a 100644
--- a/src/Internal/LinkTrait.php
+++ b/src/Internal/LinkTrait.php
@@ -17,7 +17,7 @@ trait LinkTrait
     public function __construct(string $url, Meta ...$metas)
     {
         if ($metas) {
-            $this->link = (object)['href' => $url];
+            $this->link = (object) ['href' => $url];
             foreach ($metas as $meta) {
                 $meta->attachTo($this->link);
             }
diff --git a/src/Internal/RelationshipMember.php b/src/Internal/RelationshipMember.php
index ca5fc49..3746dee 100644
--- a/src/Internal/RelationshipMember.php
+++ b/src/Internal/RelationshipMember.php
@@ -7,5 +7,4 @@
  */
 interface RelationshipMember extends ToOneMember, ToManyMember
 {
-
-}
\ No newline at end of file
+}
diff --git a/src/JsonApi.php b/src/JsonApi.php
index 8958c5d..c895bb6 100644
--- a/src/JsonApi.php
+++ b/src/JsonApi.php
@@ -12,7 +12,7 @@ final class JsonApi implements MetaDocumentMember, DataDocumentMember, ErrorDocu
 
     public function __construct(string $version = '1.0', Meta $meta = null)
     {
-        $this->obj = (object)[
+        $this->obj = (object) [
             'version' => $version,
         ];
         if ($meta) {
diff --git a/src/Link/AboutLink.php b/src/Link/AboutLink.php
index 054129e..6035330 100644
--- a/src/Link/AboutLink.php
+++ b/src/Link/AboutLink.php
@@ -2,9 +2,9 @@
 
 namespace JsonApiPhp\JsonApi\Link;
 
+use function JsonApiPhp\JsonApi\child;
 use JsonApiPhp\JsonApi\Internal\ErrorMember;
 use JsonApiPhp\JsonApi\Internal\LinkTrait;
-use function JsonApiPhp\JsonApi\child;
 
 final class AboutLink implements ErrorMember
 {
diff --git a/src/Link/FirstLink.php b/src/Link/FirstLink.php
index e569e86..755a12b 100644
--- a/src/Link/FirstLink.php
+++ b/src/Link/FirstLink.php
@@ -2,9 +2,9 @@
 
 namespace JsonApiPhp\JsonApi\Link;
 
+use function JsonApiPhp\JsonApi\child;
 use JsonApiPhp\JsonApi\Internal\LinkTrait;
 use JsonApiPhp\JsonApi\Internal\PaginationLink;
-use function JsonApiPhp\JsonApi\child;
 
 final class FirstLink implements PaginationLink
 {
diff --git a/src/Link/LastLink.php b/src/Link/LastLink.php
index 36a91e8..c11b2e0 100644
--- a/src/Link/LastLink.php
+++ b/src/Link/LastLink.php
@@ -2,9 +2,9 @@
 
 namespace JsonApiPhp\JsonApi\Link;
 
+use function JsonApiPhp\JsonApi\child;
 use JsonApiPhp\JsonApi\Internal\LinkTrait;
 use JsonApiPhp\JsonApi\Internal\PaginationLink;
-use function JsonApiPhp\JsonApi\child;
 
 final class LastLink implements PaginationLink
 {
diff --git a/src/Link/NextLink.php b/src/Link/NextLink.php
index 1b2caa1..39f5641 100644
--- a/src/Link/NextLink.php
+++ b/src/Link/NextLink.php
@@ -2,9 +2,9 @@
 
 namespace JsonApiPhp\JsonApi\Link;
 
+use function JsonApiPhp\JsonApi\child;
 use JsonApiPhp\JsonApi\Internal\LinkTrait;
 use JsonApiPhp\JsonApi\Internal\PaginationLink;
-use function JsonApiPhp\JsonApi\child;
 
 final class NextLink implements PaginationLink
 {
diff --git a/src/Link/PrevLink.php b/src/Link/PrevLink.php
index a02c69b..f38d94b 100644
--- a/src/Link/PrevLink.php
+++ b/src/Link/PrevLink.php
@@ -2,9 +2,9 @@
 
 namespace JsonApiPhp\JsonApi\Link;
 
+use function JsonApiPhp\JsonApi\child;
 use JsonApiPhp\JsonApi\Internal\LinkTrait;
 use JsonApiPhp\JsonApi\Internal\PaginationLink;
-use function JsonApiPhp\JsonApi\child;
 
 final class PrevLink implements PaginationLink
 {
diff --git a/src/Link/RelatedLink.php b/src/Link/RelatedLink.php
index f9a00e3..7434423 100644
--- a/src/Link/RelatedLink.php
+++ b/src/Link/RelatedLink.php
@@ -2,9 +2,9 @@
 
 namespace JsonApiPhp\JsonApi\Link;
 
+use function JsonApiPhp\JsonApi\child;
 use JsonApiPhp\JsonApi\Internal\LinkTrait;
 use JsonApiPhp\JsonApi\Internal\RelationshipMember;
-use function JsonApiPhp\JsonApi\child;
 
 final class RelatedLink implements RelationshipMember
 {
diff --git a/src/Link/SelfLink.php b/src/Link/SelfLink.php
index 4af9299..5a9a31f 100644
--- a/src/Link/SelfLink.php
+++ b/src/Link/SelfLink.php
@@ -2,11 +2,11 @@
 
 namespace JsonApiPhp\JsonApi\Link;
 
+use function JsonApiPhp\JsonApi\child;
 use JsonApiPhp\JsonApi\Internal\DataDocumentMember;
 use JsonApiPhp\JsonApi\Internal\LinkTrait;
 use JsonApiPhp\JsonApi\Internal\RelationshipMember;
 use JsonApiPhp\JsonApi\Internal\ResourceMember;
-use function JsonApiPhp\JsonApi\child;
 
 final class SelfLink implements DataDocumentMember, ResourceMember, RelationshipMember
 {
diff --git a/src/ResourceIdentifier.php b/src/ResourceIdentifier.php
index cf1668e..6967856 100644
--- a/src/ResourceIdentifier.php
+++ b/src/ResourceIdentifier.php
@@ -22,7 +22,7 @@ public function __construct(string $type, string $id, Meta $meta = null)
             throw new \DomainException("Invalid type value: $type");
         }
 
-        $this->obj = (object)[
+        $this->obj = (object) [
             'type' => $type,
             'id' => $id,
         ];
diff --git a/src/ResourceObject.php b/src/ResourceObject.php
index a494fbd..bab4f25 100644
--- a/src/ResourceObject.php
+++ b/src/ResourceObject.php
@@ -25,7 +25,7 @@ public function __construct(string $type, string $id, ResourceMember ...$members
         if (isValidName($type) === false) {
             throw new \DomainException("Invalid type value: $type");
         }
-        $this->obj = (object)['type' => $type, 'id' => $id];
+        $this->obj = (object) ['type' => $type, 'id' => $id];
         $fields = [];
         foreach ($members as $member) {
             if ($member instanceof Identifier) {
diff --git a/src/functions.php b/src/functions.php
index efd2b23..df50e2d 100644
--- a/src/functions.php
+++ b/src/functions.php
@@ -6,7 +6,7 @@
 
 function combine(Attachable ...$members)
 {
-    $obj = (object)[];
+    $obj = (object) [];
     foreach ($members as $member) {
         $member->attachTo($obj);
     }
@@ -16,7 +16,7 @@ function combine(Attachable ...$members)
 function child($o, string $name)
 {
     if (!isset($o->{$name})) {
-        $o->{$name} = (object)[];
+        $o->{$name} = (object) [];
     }
     return $o->{$name};
 }
diff --git a/test/ExamplesTest.php b/test/ExamplesTest.php
index e9a43a8..ba7a1cf 100644
--- a/test/ExamplesTest.php
+++ b/test/ExamplesTest.php
@@ -19,8 +19,8 @@ public function testOutputEncodesToJson(string $file)
     public function examples()
     {
         return [
-            [__DIR__ . '/../examples/compound_doc.php'],
-            [__DIR__ . '/../examples/simple_doc.php'],
+            [__DIR__.'/../examples/compound_doc.php'],
+            [__DIR__.'/../examples/simple_doc.php'],
         ];
     }
 }
diff --git a/test/benchmarks/compound10k.php b/test/benchmarks/compound10k.php
index 0fc6646..c1a0ae2 100644
--- a/test/benchmarks/compound10k.php
+++ b/test/benchmarks/compound10k.php
@@ -28,7 +28,7 @@
 use JsonApiPhp\JsonApi\ToMany;
 use JsonApiPhp\JsonApi\ToOne;
 
-require_once __DIR__ . '/../../vendor/autoload.php';
+require_once __DIR__.'/../../vendor/autoload.php';
 
 // Generate the compound document from the spec 10k times
 

From 41bffedff8570660cc80349616e1e13418143498 Mon Sep 17 00:00:00 2001
From: Alexey Karapetov <karapetov@gmail.com>
Date: Sat, 23 Feb 2019 12:05:32 -0800
Subject: [PATCH 4/7] PHPUnit deprecations fix

---
 test/CompoundDocumentTest.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/CompoundDocumentTest.php b/test/CompoundDocumentTest.php
index 3d62ff9..7441200 100644
--- a/test/CompoundDocumentTest.php
+++ b/test/CompoundDocumentTest.php
@@ -253,11 +253,11 @@ public function testIncludedResourceMayBeIdentifiedByAnotherLinkedResource()
 
     /**
      * A compound document MUST NOT include more than one resource object for each type and id pair.
-     * @expectedException \LogicException
-     * @expectedExceptionMessage Resource apples:1 is already included
      */
     public function testCanNotBeManyIncludedResourcesWithEqualIdentifiers()
     {
+        $this->expectException('LogicException');
+        $this->expectExceptionMessage('Resource apples:1 is already included');
         $apple = new ResourceObject('apples', '1');
         new CompoundDocument($apple->identifier(), new Included($apple, $apple));
     }

From adb8fb8a8c9c30495bec2a662f0a604197d871b2 Mon Sep 17 00:00:00 2001
From: Alexey Karapetov <karapetov@gmail.com>
Date: Sat, 23 Feb 2019 12:12:41 -0800
Subject: [PATCH 5/7] Update changelog

---
 CHANGELOG.md | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 86ca5ab..46030b2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [2.0.2] - 2019-02-23
+### Fixed
+- Relationship without data property (#92)
+
 ## [2.0.1] - 2018-12-31
 ### Changed
 - Downgraded min required php version to 7.1
@@ -14,5 +18,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 - v2 initial release
 
-[Unreleased]: https://github.com/json-api-php/json-api/compare/2.0.1...HEAD
+[Unreleased]: https://github.com/json-api-php/json-api/compare/2.0.2...HEAD
+[2.0.1]: https://github.com/json-api-php/json-api/compare/2.0.1...2.0.2
 [2.0.1]: https://github.com/json-api-php/json-api/compare/2.0.0...2.0.1

From 5147444fa6a5e093f811716fd7b0a9eb81396869 Mon Sep 17 00:00:00 2001
From: Alexey Karapetov <karapetov@gmail.com>
Date: Sat, 23 Feb 2019 12:12:54 -0800
Subject: [PATCH 6/7] Update changelog

---
 CHANGELOG.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 46030b2..ac780d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,5 +19,5 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - v2 initial release
 
 [Unreleased]: https://github.com/json-api-php/json-api/compare/2.0.2...HEAD
-[2.0.1]: https://github.com/json-api-php/json-api/compare/2.0.1...2.0.2
+[2.0.2]: https://github.com/json-api-php/json-api/compare/2.0.1...2.0.2
 [2.0.1]: https://github.com/json-api-php/json-api/compare/2.0.0...2.0.1

From b88232d79d8392b3cb815ebf2d5dc38a923ef669 Mon Sep 17 00:00:00 2001
From: Alexey <f3ath@users.noreply.github.com>
Date: Mon, 25 Feb 2019 10:56:58 -0800
Subject: [PATCH 7/7] Update CHANGELOG.md

---
 CHANGELOG.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac780d8..9185eeb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
-## [2.0.2] - 2019-02-23
+## [2.1.0] - 2019-02-25
 ### Fixed
 - Relationship without data property (#92)
 
@@ -18,6 +18,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 - v2 initial release
 
-[Unreleased]: https://github.com/json-api-php/json-api/compare/2.0.2...HEAD
-[2.0.2]: https://github.com/json-api-php/json-api/compare/2.0.1...2.0.2
+[Unreleased]: https://github.com/json-api-php/json-api/compare/2.1.0...HEAD
+[2.1.0]: https://github.com/json-api-php/json-api/compare/2.0.1...2.1.0
 [2.0.1]: https://github.com/json-api-php/json-api/compare/2.0.0...2.0.1

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