mongoose cannot save subdocument array after findOne

Question

I am trying to do something like this:

Industry.findOne({_id: id}).exec(function(err, industry){

    industry.stats = _.extend(industry.stats, stats);    //.......(1)

    industry.save(function(err) {
         // nothing is saved
    });
});

The console.log of industry.stats in (1) is

[{ stat_id: 545080c8e4e88b1d5a7a6d1b}{ stat_id: 54526ca6b294096d33ca6b36 }]

This is not working, apparently the industry.stats is not an object array and misses a comma in between the two objects. (am I stating this correctly?)

If I assign industry.stats directly like this

[{stat_id: 545080c8e4e88b1d5a7a6d1b}, {stat_id: 54526ca6b294096d33ca6b36}]

Then it's working. Is there something I need to do to convert (1) to an object array first? I tried lean() and toObject()...etc but I got no luck. Am I missing something?

saintedlama · Accepted Answer · 2014-11-03 21:08:28Z

1

Lodash extend will assign own enumerable properties of source object to the destination object. In this case array properties of the source (stats) are copied to industry.stats. This will not work for arrays.

You'll have to update the array via array functions (push, pull,...) or set the field directly.

answered Nov 3, 2014 at 21:08

saintedlama

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