using mongodb , mongoose, can not $push append element array. after run this, check in mongo shell , new append not there. not sure doing wrong:
usermodel.findone({ firstname: "bob" }, 'pets', function(err, user) { usermodel.update(user, { $push: { pets: { name: "pear", type: "pig" } } }, function(err, numaffected, raw) { if (err) console.log(err); console.log('updated ' + json.stringify(numaffected)); }); }); mongoose: users.ensureindex({ username: 1 }) { unique: true, background: true } mongoose: users.findone({ firstname: 'bob' }) { fields: { pets: 1 } } mongoose: users.update({ pets: [ { type: 'dog', name: 'apple' }, { type: 'cat', name: 'felix' } ], _id: objectid("56a53d45a428cbde3c4299f8") }) { '$push': { pets: { name: 'pear', type: 'pig' } } } {} updated {"ok":1,"nmodified":0,"n":0} > bob = db.users.find()[0] { "_id" : objectid("56a53d45a428cbde3c4299f8"), "firstname" : "bob", "lastname" : "smith", "username" : "bob123", "pets" : [ { "name" : "apple", "type" : "dog" }, { "name" : "felix", "type" : "cat" } ], "__v" : 0 } > update: after changing type field, still not having success. time trying push { $push: { pets: "sssss" } }.
usermodel.findone({ firstname: "bob" }, 'pets', function(err, user) { usermodel.update(user, { $push: { pets: "sssss" }}, function(err, numaffected, raw) { if (err) console.log(err); console.log('updated ' + json.stringify(numaffected)); }); }); here actual mongodb log:
2016-01-29t03:14:37.030+0000 command [conn17] command curves.$cmd command: update { update: "users", updates: [ { q: { pets: [ { pettype: "pig", name: "pear" } ], _id: objectid('56aad0a3ef5848c231ec80ed') }, u: { $push: { pets: "sssss" } }, upsert: false, multi: false } ], ordered: true, writeconcern: { w: 1 } } ntoskip:0 keyupdates:0 writeconflicts:0 numyields:0 reslen:55 locks:{ global: { acquirecount: { r: 1, w: 1 } }, database: { acquirecount: { w: 1 } }, collection: { acquirecount: { w: 1 } } } protocol:op_query 0ms
the real reason type used in pets array not correctly. actually, type 1 keyword of mongoose, used mark schema type.
if change type type1 following schema
var userschema = new mongoose.schema({ // .... pets: [{name: string, type1: string}], }); the saved pets should following _id
"pets" : [ { "name" : "o3", "type1" : "t3", "_id" : objectid("56a5df9adea3071b0de83407") }, under case, can following
usermodel.findone({ firstname: "bob" }, 'pets', function(err, user) { usermodel.update(user, { $push: { pets: { name: "pear", type1: "pig" } } }, function(err, numaffected, raw) { and result
"pets" : [ { "name" : "o3", "type1" : "t3", "_id" : objectid("56a5df9adea3071b0de83407") }, { "type1" : "pig", "name" : "pear", "_id" : objectid("56a5dff3a648301d0db118df") } ], 
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