1 files changed, 20 insertions, 0 deletions
diff --git a/jstests/core/upsert2.js b/jstests/core/upsert2.js
new file mode 100644
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+++ b/jstests/core/upsert2.js
@@ -0,0 +1,20 @@
+// A query field with a $not operator should be excluded when constructing the object to which mods
+// will be applied when performing an upsert.  SERVER-8178
+
+t = db.jstests_upsert2;
+
+// The a:$not query operator does not cause an 'a' field to be added to the upsert document.
+t.drop();
+t.update( { a:{ $not:{ $lt:1 } } }, { $set:{ b:1 } }, true );
+assert( !t.findOne().a );
+
+// The a:$not query operator does not cause an 'a' field to be added to the upsert document.
+t.drop();
+t.update( { a:{ $not:{ $elemMatch:{ a:1 } } } }, { $set:{ b:1 } }, true );
+assert( !t.findOne().a );
+
+// The a:$not query operator does not cause an 'a' field to be added to the upsert document, and as
+// a result $push can be applied to the (missing) 'a' field.
+t.drop();
+t.update( { a:{ $not:{ $elemMatch:{ a:1 } } } }, { $push:{ a:{ b:1, c:0 } } }, true );
+assert.eq( [ { b:1, c:0 } ], t.findOne().a );