1 files changed, 16 insertions, 0 deletions
diff --git a/jstests/updatek.js b/jstests/updatek.js
new file mode 100644
index 00000000000..0c6c848ab16
--- /dev/null
+++ b/jstests/updatek.js
@@ -0,0 +1,16 @@
+// Test modifier operations on numerically equivalent string field names.  SERVER-4776
+
+t = db.jstests_updatek;
+
+t.drop();
+t.save( { _id:0, '1':{}, '01':{} } );
+t.update( {}, { $set:{ '1.b':1, '1.c':2 } } );
+// make sure correct fields are set, with no duplicates
+// must use string comparison because V8 reorders fields that are numerical in objects
+assert.eq( "{ \"01\" : { }, \"1\" : { \"b\" : 1, \"c\" : 2 }, \"_id\" : 0 }", tojson(t.findOne()) );
+
+t.drop();
+t.save( { _id:0, '1':{}, '01':{} } );
+t.update( {}, { $set:{ '1.b':1, '01.c':2 } } );
+assert.eq( "{ \"01\" : { \"c\" : 2 }, \"1\" : { \"b\" : 1 }, \"_id\" : 0 }", tojson(t.findOne()) );
+