how to merge field from mongodb collection

Question

that's my model

var schema = new mongoose.Schema({   
    title:  String,
    link: String,
    gid: Number,
    posts: [],
    date: { type: Date, default: Date.now }, 
}, { collection: 'Group' });

var Group = mongoose.model('Group', schema);

I need to get all posts objects from collection by one query.

Answer 1

Using mongoose it should work with the following statement using a projection to return only the posts field (and the _id field)

Group.find({},{"posts":1} ).exec(callback)

To only get all posts you have to use an aggregation.

Group.aggregate([{$unwind : "$posts"}, {$project: {"post":"$posts", _id:0}}]).exec(callback)