Modify the aggregation logic to handle keys for subdocuments.

src/Jenssegers/Mongodb/Builder.php

@@ -114,7 +114,16 @@ class Builder extends \Illuminate\Database\Query\Builder {
                     // Pass other functions directly
                     else
                     {
-                        $group[$column] = array('$' . $function => '$' . $column);
+                        // Normally this aggregate function would overwrite the
+                        // $last group set above, but since we are modifying
+                        // the string, we need to unset it directly.
+                        if (isset($group[$column]))
+                        {
+                            unset($group[$column]);
+                        }
+
+                        $key = str_replace('.', '_', $column);
+                        $group[$key] = array('$' . $function => '$' . $column);
                     }
                 }
             }
@@ -203,7 +212,8 @@ class Builder extends \Illuminate\Database\Query\Builder {
 
         if (isset($results[0]))
         {
-            return $results[0][$columns[0]];
+            $key = str_replace('.', '_', $columns[0]);
+            return $results[0][$key];
         }
     }
 

tests/QueryTest.php

@@ -5,14 +5,14 @@ class QueryTest extends PHPUnit_Framework_TestCase {
 
 	public static function setUpBeforeClass()
 	{
-		User::create(array('name' => 'John Doe', 'age' => 35, 'title' => 'admin'));
-		User::create(array('name' => 'Jane Doe', 'age' => 33, 'title' => 'admin'));
-		User::create(array('name' => 'Harry Hoe', 'age' => 13, 'title' => 'user'));
-		User::create(array('name' => 'Robert Roe', 'age' => 37, 'title' => 'user'));
-		User::create(array('name' => 'Mark Moe', 'age' => 23, 'title' => 'user'));
-		User::create(array('name' => 'Brett Boe', 'age' => 35, 'title' => 'user'));
-		User::create(array('name' => 'Tommy Toe', 'age' => 33, 'title' => 'user'));
-		User::create(array('name' => 'Yvonne Yoe', 'age' => 35, 'title' => 'admin'));
+		User::create(array('name' => 'John Doe', 'age' => 35, 'title' => 'admin', 'subdocument' => array('age' => 35)));
+		User::create(array('name' => 'Jane Doe', 'age' => 33, 'title' => 'admin', 'subdocument' => array('age' => 33)));
+		User::create(array('name' => 'Harry Hoe', 'age' => 13, 'title' => 'user', 'subdocument' => array('age' => 13)));
+		User::create(array('name' => 'Robert Roe', 'age' => 37, 'title' => 'user', 'subdocument' => array('age' => 37)));
+		User::create(array('name' => 'Mark Moe', 'age' => 23, 'title' => 'user', 'subdocument' => array('age' => 23)));
+		User::create(array('name' => 'Brett Boe', 'age' => 35, 'title' => 'user', 'subdocument' => array('age' => 35)));
+		User::create(array('name' => 'Tommy Toe', 'age' => 33, 'title' => 'user', 'subdocument' => array('age' => 33)));
+		User::create(array('name' => 'Yvonne Yoe', 'age' => 35, 'title' => 'admin', 'subdocument' => array('age' => 35)));
 		User::create(array('name' => 'Error', 'age' => null, 'title' => null));
 	}
 
@@ -176,6 +176,11 @@ class QueryTest extends PHPUnit_Framework_TestCase {
 		$this->assertEquals(30.5, User::avg('age'));
 		$this->assertEquals(244, User::sum('age'));
 
+		$this->assertEquals(37, User::max('subdocument.age'));
+		$this->assertEquals(13, User::min('subdocument.age'));
+		$this->assertEquals(30.5, User::avg('subdocument.age'));
+		$this->assertEquals(244, User::sum('subdocument.age'));
+
 		$this->assertEquals(35, User::where('title', 'admin')->max('age'));
 		$this->assertEquals(37, User::where('title', 'user')->max('age'));