[Feature] Improve/fix handling of links on relationship documents

See #111
See #105

CHANGELOG.md

@@ -13,11 +13,18 @@ All notable changes to this project will be documented in this file. This projec
 - [#127](https://github.com/laravel-json-api/laravel/issues/127) The `JsonApiResource` class now has a
   protected `serializeRelation` method that can be used to override the default serialization of relationships if
   needed.
+- [#111](https://github.com/laravel-json-api/laravel/issues/111) Relationship documents returned by relationship `self`
+  routes will now include any non-standard links set on the resource relationship in the top-level `links` member.
 
 ### Fixed
 
 - [#130](https://github.com/laravel-json-api/laravel/issues/130) The `JsonApiResource` now correctly handles conditional
   fields when iterating over relationships to find a specific relation.
+- [#105](https://github.com/laravel-json-api/laravel/issues/105) The JSON:API document returned by a relationship `self`
+  route now handles a relationship not existing if it is hidden. Previously an exception was thrown when attempting to
+  merge relationship links into the document.
+- [#111](https://github.com/laravel-json-api/laravel/issues/111) Relationship documents now handle a relationship that
+  does not have one or both of the `self` and `related` relationship links.
 
 ## [1.0.1] - 2021-12-08
 

composer.json

@@ -27,7 +27,7 @@
         "ext-json": "*",
         "laravel-json-api/core": "^1.1",
         "laravel-json-api/eloquent": "^1.0.1",
-        "laravel-json-api/encoder-neomerx": "^1.0.0",
+        "laravel-json-api/encoder-neomerx": "^1.1",
         "laravel-json-api/exceptions": "^1.0.0",
         "laravel-json-api/spec": "^1.0.0",
         "laravel-json-api/validation": "^1.0.0",

tests/dummy/tests/Api/V1/Posts/ReadTest.php

@@ -37,9 +37,9 @@ public function test(): void
             ->withoutExceptionHandling()
             ->jsonApi()
             ->expects('posts')
-            ->get(url('/api/v1/posts', $expected['id']));
+            ->get($self = url('/api/v1/posts', $expected['id']));
 
-        $response->assertFetchedOneExact($expected);
+        $response->assertFetchedOneExact($expected)->assertLinks(compact('self'));
     }
 
     public function testIncludeAuthorAndTags(): void