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When I try to use $documents operator in playground,

db.collection.aggregate([
  {
    "$documents": [
      {
        "test": 123
      }
    ]
  }
])

I get below error:

query failed: (InvalidNamespace) '$documents' can only be run with {aggregate: 1}

Playground to reproduce.

---

Alternatives that I have tried(but also failed): Removing collection in db.collection.aggregate([...]): will get syntax error like:

Invalid query:

Line 1: Expected '.' instead of '('

Playground

What could be a correct way to use $documents in Mongo Playground?

Hi @GithubArray,

Thanks for the report. This is happening because $documents is only available when calling db.aggregate() (ie, not running aggregation on a specific collection). This is not supported by the playground yet and might be tricky to implement, so the best solution for now is to remove the $documents stage, put the documents in an other collection, and run the aggregation on this collection.