From 2edf2a22890faf8bc9fc0f64e745e12428fc6cbf Mon Sep 17 00:00:00 2001
From: Divjot Arora <divjot.arora@10gen.com>
Date: Wed, 5 Jun 2019 12:47:28 -0400
Subject: [PATCH] Set limit to -1 for Collection.FindOne

GODRIVER-1112

Change-Id: I9f7b5b9c4a49bb54099b47422b605073f9790540
---
 mongo/collection.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mongo/collection.go b/mongo/collection.go
index 0e5bd2220b..e688904394 100644
--- a/mongo/collection.go
+++ b/mongo/collection.go
@@ -991,6 +991,9 @@ func (coll *Collection) FindOne(ctx context.Context, filter interface{},
 			Sort:                opt.Sort,
 		}
 	}
+	// Unconditionally send a limit to make sure only one document is returned and the cursor is not kept open
+	// by the server.
+	findOpts = append(findOpts, options.Find().SetLimit(-1))
 
 	batchCursor, err := driver.Find(
 		ctx, cmd,