I have a MongoDB collection with documents in the following format:
{ \"_id\" : ObjectId(\"4e8ae86d08101908e1000001\"), \"name\" : [\"Name\"], \"zipcod
Although the above answers all work, What you originally tried to do was the correct way, however you just have the syntax backwards (switch "$size" and "$gt")..
Correct:
db.collection.find({items: {$gt: {$size: 1}}})
Incorrect:
db.collection.find({items: {$size: {$gt: 1}}})