mongoose nested document

Question

what i want, is to only return the _id and data in meta (not my field, but since mongoose has this prime example): mongoose embedd documents doc

so, i'm not looking for any _id in particular, i'm looking for records with meta.votes.length > 0 or meta.fans.length > 0. currently i do:

Model.find({}, ['_id','meta'], function (err, data) { callback(null, data); });

i get records with no /data/. i guess an alternative to not finding these sets would be a way to filter them out?

EDIT: i have temporarily resolved my issue with:

use : { type: Boolean, default: 1 },

though this might be a feature (showing and hiding results - old data for instance), i don't consider this a /solution/.

Bryan Clark · Accepted Answer · 2012-07-14 18:05:46Z

Well meta.votes and meta.fans are both just Number objects so I don't think you want meta.fans.length just access them directly like an int.

This query should retrieve just the _id and meta information for votes > 0

Model.find({ "meta.votes" : { $gt : 0 } }, ['_id','meta']).exec(function(err, data) {
   callback(null, data);
});

And this query should retrieve just the _id and meta information for fans > 0

Model.find({ "meta.fans" : { $gt : 0 } }, ['_id','meta']).exec(function(err, data) {
   callback(null, data);
});

And you could pull both queries together like this:

Model.find({ $or : [ { "meta.votes" : { $gt : 0 } },
                     { "meta.fans" : { $gt : 0 } } ] }, ['_id','meta']).exec(function(err, data) {
   callback(null, data);
});

You should be seeing returns like: { _id: 5001b3ce7cf4b534a3000002, meta: { votes: 1, fans: 1 } }

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