MongoDB remove an item from an array inside an array of objects

Question

I have a document that looks like this:

{
  \"_id\" : ObjectId(\"56fea43a571332cc97e06d9c\"),
  \"sections\" : [
    {
      \"_id\" : ObjectId(\"56fea43a571         


        

Answer 1

You need to use the positional $ update operator to remove the element from your array. You need this is because "sections" is an array of sub-documents.

db.test.findOneAndUpdate(
    { "sections._id" : ObjectId("56fea43a571332cc97e06d9e") }, 
    { "$pull": { "sections.$.registered": "e3d65a4e-2552-4995-ac5a-3c5180258d87" } } 
)