Referencing another schema in Mongoose

Question

if I have two schemas like    var userSchema   new Schema       twittername  String      twitterID  Number      displayName  String      profilePic  String       var  User   mongoose model  User     var postSchema   new Schema       name  String      postedBy  User     User Model Type     dateCreated  Date      comments    body  string   by  mongoose Schema Types ObjectId          I tried to connect them together like the example above but I couldn t figure out how to do it  Eventually  if I can do something like this it would make my life very easy  var profilePic   Post postedBy profilePic

User · Accepted Answer

It sounds like the populate method is what your looking for. First make small change to your post schema:

var postSchema = new Schema({
    name: String,
    postedBy: {type: mongoose.Schema.Types.ObjectId, ref: 'User'},
    dateCreated: Date,
    comments: [{body:"string", by: mongoose.Schema.Types.ObjectId}],
});

Then make your model:

var Post = mongoose.model('Post', postSchema);

Then, when you make your query, you can populate references like this:

Post.findOne({_id: 123})
.populate('postedBy')
.exec(function(err, post) {
    // do stuff with post
});

User · Answer

Addendum  No one mentioned  Populate  --- it is very much worth your time and money looking at Mongooses Populate Method   Also explains cross documents referencing  http   mongoosejs com docs populate html

User · Answer

Late reply  but adding that Mongoose also has the concept of Subdocuments  With this syntax  you should be able to reference your userSchema as a type in your postSchema like so   var userSchema   new Schema       twittername  String      twitterID  Number      displayName  String      profilePic  String       var postSchema   new Schema       name  String      postedBy  userSchema      dateCreated  Date      comments    body  string   by  mongoose Schema Types ObjectId          Note the updated postedBy field with type userSchema    This will embed the user object within the post  saving an extra lookup required by using a reference  Sometimes this could be preferable  other times the ref populate route might be the way to go  Depends on what your application is doing

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