Question

I have a collection called “Binders”
In this collection I have a field called “docs” that references a “Docs” schema

I want to pull a “Binder” by id with findOne() which is no problem.

But I want to limit the returned “Docs” by a field comparison

I am somewhat new to mongoose but if i had pseudo my query…

Binder.findOne({_id: req.binder._id}, {$where {docs.type = 'type1'}}, function(error, binder) { 

// So this would return my full binder but only the docs where their .type = 'type1'

});

Where I get lost is the limiting based on a Schema

{$where {docs.type = 'type1'}}

So if I pulled a binder and it had 50 docs, but none of the docs were of type1 I would still get my binder info, however there would be no documents in the Docs field.

Hope that makes sense.

Answer 1

If I’m following you right and docs is an array, then you can use the $elemMatch projection operator to do this:

Binder.findOne({_id: req.binder._id}, {docs: {$elemMatch: {type: 'type1'}}}, ...