How to populate a sub-document in mongoose after creating it

Question

I am adding a comment to an item comments list  I need to get the comment created by user data before I output it in the response  How should I do this       Item findById req param  itemid    function err  item           var comment   item comments create               body  req body body               created by  logged in user                      item comments push comment            item save function err  item               res json                   status   success                   message   You have commented on this item      how do i populate comment created by here                     comment  item comments id comment  id                                end item save           end item find   I need to populate the comment created by field here in my res json output                   comment  item comments id comment  id    comment created by is a user reference in my mongoose CommentSchema  It currently is only giving me a user id  I need it populated with all the user data  except for password and salt fields   Here is the schema as people have asked   var CommentSchema   new Schema       body              type  String  required  true       created by        type  Schema ObjectId  ref   User   index  true       created at        type  Date       updated at        type  Date        var ItemSchema   new Schema       name        type  String  required  true  trim  true       created by      type  Schema ObjectId  ref   User   index  true       comments     CommentSchema

User · Answer

This might have changed since the original answer was written  but it looks like you can now use the Models populate function to do this without having to execute an extra findOne   See  http   mongoosejs com docs api html model Model populate   You d want to use this inside the save handler just like the findOne is

User · Answer

I faced the same problem but after hours of efforts i find the solution It can be without using any external plugin    applicantListToExport  function  query  callback      this     find query  select   advtId   0       populate         path   influId         model   influencer         select      id   1  user  1         populate            path   userid           model   User                  populate  campaignId    campaignTitle  1     exec callback

User · Answer

In order to populate referenced subdocuments  you need to explicitly define the document collection to which the ID references to  like created by    type  Schema Types ObjectId  ref   User       Given this reference is defined and your schema is otherwise well defined as well  you can now just call populate as usual  e g  populate  comments created by     Proof of concept code      Schema var mongoose   require  mongoose    var Schema   mongoose Schema   var UserSchema   new Schema     name  String      var CommentSchema   new Schema     text  String    created by    type  Schema Types ObjectId  ref   User         var ItemSchema   new Schema      comments   CommentSchema          Connect to DB and instantiate models     var db   mongoose connect  enter your database here    var User   db model  User   UserSchema   var Comment   db model  Comment   CommentSchema   var Item   db model  Item   ItemSchema       Find and populate Item find     populate  comments created by   exec function err  items        console log items 0  comments 0  created by name         Finally note that populate works only for queries so you need to first pass your item into a query and then call it   item save function err  item        Item findOne item  populate  comments created by   exec function  err  item            res json               status   success               message   You have commented on this item               comment  item comments id comment  id

User · Answer

user1417684 and  chris-foster are right   excerpt from working code  without error handling    var SubItemModel   mongoose model  subitems   SubItemSchema   var ItemModel      mongoose model  items   ItemSchema    var new sub item model   new SubItemModel new sub item plain   new sub item model save function  error  new sub item       var new item   new ItemModel new item     new item subitem   new sub item  id    new item save function  error  new item           so this is a valid way to populate via the Model        as documented in comments above  here  stack overflow       ItemModel populate new item    path   subitem   model   subitems     function error  new item          callback new item toObject                    or populate directly on the result object     new item populate  subitem   function error  new item          callback new item toObject

[node.js] How to populate a sub-document in mongoose after creating it?

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