i using mongoose 4.3.6 in node.js app.
say, example, have 2 models:
var user = mongoose.model('user', someparentschema.extend({ _id: string, name: string })); var = mongoose.model('like', anotherparentschema.extend({ _id: string, user_id: { type: string, ref: 'user' } })); i using mongoose-schema-extend, , can sake of question both entities extend parent schema.
since using ref, in theory model.populate should auto-populate field user model.
the ref option tells mongoose model use during population
like.findone({}).populate('user_id').exec(callback); the above never works. simple (the field ends null). have make work:
like.findone({}).populate({ path: 'user_id', model: 'user' }).exec(callback); when that, field expected user object (but reason had explicitly tell populate path user model; though ref supposed handle that, according mongoose docs linked above).
am missing something?
i test sample codes following, query like.findone({}).populate('user_id').exec(callback); seems work well.
schema:
var personschema = new mongoose.schema({ t: string }, {collection: 'persons'}); var user = mongoose.model('user', personschema.extend({ _id: string, name: string })); var parentschema = new mongoose.schema({ s: string }, {collection: 'parent'}); var = mongoose.model('like', parentschema.extend({ _id: string, user_id: { type: string, ref: 'user' } })); insert data db,
var user = new user({ t: 't1', _id: '1234567', name: 'test' }); var = new like({ s: 's1', _id: '23456789', }); user.save(function(err, u){ if(err) console.log(err); else { like.user_id = u._id; console.log(like); like.save(function(err) { if (err) console.log(err); else console.log('save , user....'); }); } }); query
like.findone({}).populate('user_id').exec(function(err, doc) { if (err) console.log(err); else console.log(doc); }); and result
{ _id: '23456789', __t: 'like', user_id: { _id: '1234567', __t: 'user', t: 't1', name: 'test', __v: 0 }, s: 's1', __v: 0 } 
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