allow non namepsaced schema (#8)

Author: nick-zh

example/schemaTemplates/embedded/Book.avsc

@@ -1,6 +1,5 @@
 {
     "type": "record",
-    "namespace": "com.example",
     "name": "Book",
     "fields": [
         { "name": "title", "type": "string" },

example/schemaTemplates/embedded/Collection.avsc

@@ -4,6 +4,6 @@
     "name": "Collection",
     "fields": [
         { "name": "name", "type": "string" },
-        { "name": "items", "type": {"type": "array", "items": ["com.example.Book", "com.example.CD"] }, "default": [] }
+        { "name": "items", "type": {"type": "array", "items": ["Book", "com.example.CD"] }, "default": [] }
     ]
 }

src/Registry/SchemaRegistry.php

@@ -150,7 +150,11 @@ public function getSchemaId(array $schemaData, SchemaTemplateInterface $template
             return str_replace('.' . Avro::FILE_EXTENSION, '', $template->getFilename());
         }
 
-        return $schemaData['namespace'] . '.' . $schemaData['name'];
+        if (true === isset($schemaData['namespace'])) {
+            return $schemaData['namespace'] . '.' . $schemaData['name'];
+        }
+
+        return $schemaData['name'];
     }
 
     /**

tests/Integration/Registry/SchemaRegistryTest.php

@@ -27,7 +27,7 @@ public function testSchemaDirectories()
     public function testLoad()
     {
         $schemaIds = [
-            'com.example.Book',
+            'Book',
             'com.example.CD',
             'com.example.Collection',
             'com.example.Page',