How do I manually add a reference in MongoDB?
This worked for me from the MongoDB shell, I'm using $addToSet instead of $push because I assume you want to avoid dupes:
var o = new ObjectId();db.foo.update({}, {$addToSet : {"contacts" : o}});var o = new ObjectId();db.foo.update({}, {$addToSet : {"contacts" : o}});That gave me a document that looks like this (my foo collection only contained your sample, so I didn't have to have a specific matching criteria):
{ "_id" : ObjectId("500c2118c78bb07bfbb69eb3"), "contacts" : [ ObjectId("500c20efc78bb07bfbb69eb2"), ObjectId("500c227ac78bb07bfbb69eb6") ], "email" : "kyogron@example.de", "username" : "kyogron"}
In mongo shell run the following update:
db.collection.update({"_id" : ObjectId("500abe6a25dff13c7c000001")}, {$push:{"contacts": ObjectId("500abe6a2543213c7c000002")}})Use appropriate ObjectId values for your specific case.