Let Field implement JsonSerializable

Author: danmichaelo

src/Fields/Field.php

@@ -4,7 +4,7 @@
 
 use Scriptotek\Marc\Record;
 
-class Field
+abstract class Field implements \JsonSerializable
 {
     protected $field;
 
@@ -13,6 +13,11 @@ public function __construct(\File_MARC_Field $field)
         $this->field = $field;
     }
 
+    public function jsonSerialize()
+    {
+        return (string) $this;
+    }
+
     public function __call($name, $args)
     {
         return call_user_func_array([$this->field, $name], $args);

src/Fields/Subject.php

@@ -83,4 +83,14 @@ public function __toString()
     {
         return implode(self::$glue, $this->getParts());
     }
+
+    public function jsonSerialize()
+    {
+        return [
+            'type' => $this->getType(),
+            'vocabulary' => $this->getVocabulary(),
+            'id' => $this->getControlNumber(),
+            'term' => (string) $this,
+        ];
+    }
 }

tests/FieldsTest.php

@@ -20,6 +20,10 @@ public function testIsbn()
         $record = Record::fromString($source);
         $this->assertEquals(['8200424421'], $record->isbns);
         $this->assertEquals('Nkr 98.00', $record->isbns[0]->sf('c'));
+        $this->assertEquals(
+            json_encode(['isbns' => ['8200424421']]),
+            json_encode(['isbns' => $record->isbns])
+        );
     }
 
     public function test020withoutA()
@@ -35,7 +39,11 @@ public function test020withoutA()
           </record>';
 
         $record = Record::fromString($source);
-        $this->assertEquals(array(''), $record->isbns);
+        $this->assertEquals([''], $record->isbns);
+        $this->assertEquals(
+            json_encode(['isbns' => ['']]),
+            json_encode(['isbns' => $record->isbns])
+        );
     }
 
     public function testId()
@@ -48,5 +56,9 @@ public function testId()
 
         $record = Record::fromString($source);
         $this->assertEquals('98218834x', $record->id);
+        $this->assertEquals(
+            json_encode(['id' => '98218834x']),
+            json_encode(['id' => $record->id])
+        );
     }
 }

tests/SubjectFieldTest.php

@@ -68,4 +68,20 @@ public function testEdit()
         $record->subjects[0]->delete();
         $this->assertCount(0, $record->subjects);
     }
+
+    public function testJsonSerialization()
+    {
+        $record = $this->getNthrecord(3);
+        $subject = $record->subjects[1];
+
+        $this->assertJsonStringEqualsJsonString(
+            json_encode([
+                'vocabulary' => 'noubomn',
+                'type' => Subject::TOPICAL_TERM,
+                'id' => null,
+                'term' => 'Elementærpartikler'
+            ]),
+            json_encode($subject)
+        );
+    }
 }

tests/TitleFieldTest.php

@@ -124,4 +124,22 @@ public function testTitleWithMultiplePartSubfields()
         $title = new Title($field);
         $this->assertEquals('Zentralblatt für Bakteriologie. 1. Abt. Originale. Reihe B, Hygiene, Krankenhaushygiene, Betriebshygiene, präventive Medizin.', strval($title));
     }
+
+    public function testJsonSerialization()
+    {
+        $field = new File_MARC_Data_Field('245', array(
+            new File_MARC_Subfield('a', 'Zentralblatt für Bakteriologie.'),
+            new File_MARC_Subfield('n', '1. Abt. Originale.'),
+            new File_MARC_Subfield('n', 'Reihe B,'),
+            new File_MARC_Subfield('p', 'Hygiene, Krankenhaushygiene, Betriebshygiene, präventive Medizin.'),
+        ));
+        $title = new Title($field);
+
+        $this->assertJsonStringEqualsJsonString(
+            json_encode([
+                'title' => 'Zentralblatt für Bakteriologie. 1. Abt. Originale. Reihe B, Hygiene, Krankenhaushygiene, Betriebshygiene, präventive Medizin.',
+            ]),
+            json_encode(['title' => $title])
+        );
+    }
 }