I am unable to utilize $cond for adding a new field to a MongoDB collection because the error states that multi update is not supported for replacement-style update

As I dive deeper into MongoDB commands, I encountered an issue that I'm struggling to resolve. Within my collection of many users, I am attempting to update all users by adding a new field. This field should be set to true if the user registered after May 5th, 2020, and false otherwise. Here is the code snippet I used:

db.users.updateMany({},
{
  $set: {
    "fidelity": {
      $cond: {
        if: {
          $gte: [
            "$registration",
            newDate("2020-05-05")
          ],
          then: true,
          else: false
        }
      }
    }
  }
})

The error message I received: https://i.sstatic.net/RID5K.png

javascriptjsondatabasemongodb

Answer №1

When using $cond as an aggregation pipeline operator, make sure you are not mistakenly implementing a simple update instead. In this case, $cond may be misinterpreted as a nested key rather than an operator.

{$cond: {
        if: {
          $gte: [
            "$registration",
            newDate("2020-05-05")
          ],
          then: true,
          else: false
        }
      }}

This can lead to issues where the field name starting with $ is not recognized due to MongoDB limitations.

  • To utilize the aggregation pipeline in the update, ensure that the pipeline is provided as an array and refer to the documentation for accurate syntax.
  • If excluding $cond is necessary, explore alternative methods of expressing your intentions.

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