duplicate property validation

Author: nekufa

src/Space.php

@@ -28,6 +28,11 @@ public function __construct(Mapper $mapper, $id, $name)
     public function addProperty($name, $type)
     {
         $format = $this->getFormat();
+        foreach($format as $field) {
+            if($field['name'] == $name) {
+                throw new Exception("Property $name exists");
+            }
+        }
         $format[] = compact('name', 'type');
         $this->format = $format;
         $this->mapper->getClient()->evaluate("box.space[$this->id]:format(...)", [$format]);

tests/SchemaTest.php

@@ -5,6 +5,18 @@
 
 class SchemaTest extends TestCase
 {
+    public function testDuplicateProperty()
+    {
+        $mapper = $this->createMapper();
+        $this->clean($mapper);
+
+        $space = $mapper->getSchema()->createSpace('tester');
+        $space->addProperty('id', 'unsigned');
+        $this->expectException(Exception::class);
+        
+        $space->addProperty('id', 'unsigned');
+    }
+
     public function testRemoveProperty()
     {
         $mapper = $this->createMapper();