fix resolving references to a file without jsonPointer

Author: cebe

src/spec/Paths.php

@@ -192,6 +192,9 @@ public function getIterator()
     public function resolveReferences(ReferenceContext $context)
     {
         foreach ($this->_paths as $key => $path) {
+            if ($path === null) {
+                continue;
+            }
             $path->resolveReferences($context);
         }
     }

src/spec/Reference.php

@@ -102,7 +102,7 @@ public function resolve(ReferenceContext $context)
 
         $file = ($pos === false) ? $this->_ref : substr($this->_ref, 0, $pos);
         $file = $context->resolveRelativeUri($file);
-        $jsonPointer = substr($this->_ref, $pos + 1);
+        $jsonPointer = ($pos === false) ? '' : substr($this->_ref, $pos + 1);
 
         // TODO could be a good idea to cache loaded files in current context to avoid loading the same files over and over again
         $fileContent = $this->fetchReferencedFile($file);

tests/spec/ReferenceTest.php

@@ -153,6 +153,18 @@ public function testResolveFile()
         $this->assertInstanceOf(Schema::class, $petItems = $openapi->components->schemas['Dog']);
         $this->assertArrayHasKey('id', $openapi->components->schemas['Pet']->properties);
         $this->assertArrayHasKey('name', $openapi->components->schemas['Dog']->properties);
+
+        // second level reference inside of definitions.yaml
+        $this->assertArrayHasKey('food', $openapi->components->schemas['Dog']->properties);
+        $this->assertInstanceOf(Reference::class, $openapi->components->schemas['Dog']->properties['food']);
+
+        $openapi->resolveReferences(new \cebe\openapi\ReferenceContext($openapi, $file));
+
+        $this->assertArrayHasKey('food', $openapi->components->schemas['Dog']->properties);
+        $this->assertInstanceOf(Schema::class, $openapi->components->schemas['Dog']->properties['food']);
+        $this->assertArrayHasKey('id', $openapi->components->schemas['Dog']->properties['food']->properties);
+        $this->assertArrayHasKey('name', $openapi->components->schemas['Dog']->properties['food']->properties);
+        $this->assertEquals(1, $openapi->components->schemas['Dog']->properties['food']->properties['id']->example);
     }
 
     public function testResolveFileHttp()

tests/spec/data/reference/Food.yaml

@@ -0,0 +1,6 @@
+properties:
+  id:
+    type: integer
+    example: 1
+  name:
+    type: string

tests/spec/data/reference/definitions.yaml

@@ -9,3 +9,5 @@ Dog:
   properties:
     name:
       type: string
+    food:
+      $ref: 'Food.yaml'