Primary index is alias for unique index

src/Jenssegers/Mongodb/Schema/Blueprint.php

@@ -70,6 +70,18 @@ class Blueprint extends \Illuminate\Database\Schema\Blueprint {
         return $this;
     }
 
+    /**
+     * Specify the primary key(s) for the table.
+     *
+     * @param  string|array  $columns
+     * @param  array         $options
+     * @return \Illuminate\Support\Fluent
+     */
+    public function primary($columns = null, $options = array())
+    {
+        return $this->unique($columns, $options);
+    }
+
     /**
      * Indicate that the given index should be dropped.
      *

tests/SchemaTest.php

@@ -52,19 +52,38 @@ class SchemaTest extends TestCase {
     {
         Schema::collection('newcollection', function ($collection)
         {
-            $collection->index('mykey');
+            $collection->index('mykey1');
         });
 
-        $index = $this->getIndex('newcollection', 'mykey');
-        $this->assertEquals(1, $index['key']['mykey']);
+        $index = $this->getIndex('newcollection', 'mykey1');
+        $this->assertEquals(1, $index['key']['mykey1']);
+
+        Schema::collection('newcollection', function ($collection)
+        {
+            $collection->index(['mykey2']);
+        });
+
+        $index = $this->getIndex('newcollection', 'mykey2');
+        $this->assertEquals(1, $index['key']['mykey2']);
+
+        Schema::collection('newcollection', function ($collection)
+        {
+            $collection->string('mykey3')->index();
+        });
 
+        $index = $this->getIndex('newcollection', 'mykey3');
+        $this->assertEquals(1, $index['key']['mykey3']);
+    }
+
+    public function testPrimary()
+    {
         Schema::collection('newcollection', function ($collection)
         {
-            $collection->index(['mykey']);
+            $collection->string('mykey', 100)->primary();
         });
 
         $index = $this->getIndex('newcollection', 'mykey');
-        $this->assertEquals(1, $index['key']['mykey']);
+        $this->assertEquals(1, $index['unique']);
     }
 
     public function testUnique()