Question

For example I have this document:

db.test.save({
  _id: 1,
  list: [
    { key: "a" },
    { key: "b" },
    { key: "c" },
    { key: "d" },
    { key: "e" }
  ]
})

and I need remove to the second element from the list.

For now I do that in two steps. I first unset the second list element but the $unset operator doesn’t remove the element, it modifies it to null, and after that I pull any nullable value from the list field:

db.test.update({_id: 1}, {$unset: {"list.2": 1}})
db.test.update({_id: 1}, {$pull: {list: null}})

Is there a solution to do that in one operation?

Answer 1

No, unfortunately what you are doing is currently the best option. Have a look at this question: In mongoDb, how do you remove an array element by its index which links to a Jira for this very issue.