Support delete one document

src/Query/Builder.php

@@ -703,7 +703,14 @@ public function delete($id = null)
         $wheres = $this->compileWheres();
         $options = $this->inheritConnectionOptions();
 
-        $result = $this->collection->deleteMany($wheres, $options);
+        if (is_int($this->limit)) {
+            if ($this->limit !== 1) {
+                throw new \LogicException(sprintf('Delete limit can be 1 or null (unlimited). Got %d', $this->limit));
+            }
+            $result = $this->collection->deleteOne($wheres, $options);
+        } else {
+            $result = $this->collection->deleteMany($wheres, $options);
+        }
 
         if (1 == (int) $result->isAcknowledged()) {
             return $result->getDeletedCount();

tests/QueryTest.php

@@ -548,4 +548,40 @@ public function testMultipleSortOrder(): void
         $this->assertEquals('John Doe', $subset[1]->name);
         $this->assertEquals('Brett Boe', $subset[2]->name);
     }
+
+    public function testDelete(): void
+    {
+        // Check fixtures
+        $this->assertEquals(3, User::where('title', 'admin')->count());
+
+        // Delete a single document with filter
+        User::where('title', 'admin')->limit(1)->delete();
+        $this->assertEquals(2, User::where('title', 'admin')->count());
+
+        // Delete all with filter
+        User::where('title', 'admin')->delete();
+        $this->assertEquals(0, User::where('title', 'admin')->count());
+
+        // Check remaining fixtures
+        $this->assertEquals(6, User::count());
+
+        // Delete a single document
+        User::limit(1)->delete();
+        $this->assertEquals(5, User::count());
+
+        // Delete all
+        User::limit(null)->delete();
+        $this->assertEquals(0, User::count());
+    }
+
+    /**
+     * @testWith [0]
+     *           [2]
+     */
+    public function testDeleteException(int $limit): void
+    {
+        $this->expectException(\LogicException::class);
+        $this->expectExceptionMessage('Delete limit can be 1 or null (unlimited).');
+        User::limit($limit)->delete();
+    }
 }