Remove an object from a nested array with $pull and $[identifier] (mongoDB 3.6)

Question

MongoDB 3.6 allow to perform complex array manipulations against all matching elements in any array – no matter how deeply nested – Update Nested Arrays with $[identifier]

Answer 1

Try positional all $[] variant.

Something like

db.runCommand({
  update: "survey",
  updates: [
    {
      q: {},
      u: {
        $pull: {
          "results.$[].items.$[].comments": { "id":  "123456" }
        }
      }
    }
  ]
})