Failed to run mongodb query

When I try to run this mongodb on both local install or redash demo, a error raised “Error running query: string indices must be integers”

Below is the query, I think this is an error of python code since I can run other simple query just fine.

{
    "collection": "Email",
    "aggregate": [
        {
            "$group": {
                "_id": {
                    "$dateToString": {
                        "format": "%Y-%m-%d",
                        "date": "$sendTime"
                    }
                },
                "sent": {
                    "$sum": {
                        "$cond": {
                            "if": {
                                "$gte": [
                                    "$sent",
                                    1
                                ]
                            },
                            "then": 1,
                            "else": 0
                        }
                    }
                },
                "opened": {
                    "$sum": {
                        "$cond": {
                            "if": {
                                "$gte": [
                                    "$opened",
                                    1
                                ]
                            },
                            "then": 1,
                            "else": 0
                        }
                    }
                },
                "clicked": {
                    "$sum": {
                        "$cond": {
                            "if": {
                                "$gte": [
                                    "$clicked",
                                    1
                                ]
                            },
                            "then": 1,
                            "else": 0
                        }
                    }
                }
            }
        },
        {
            "$limit": 10
        }
    ]
}

[erans]

The format we use is slightly different in order to be able to maintain the order of fields, similar to what we do in regular queries.

Therefore, the query should look something like this:

{
  "collection": "places",
  "aggregate": [
    {
      "$group": {
        "_id": {"place_id": "$place_id", "place_name": "$place_name"},
        "count": { "$sum": 1 }
      }
    },
    {
      "$project": {
        "_id": "$_id.place_id",
        "name": "$_id.place_name",
        "count": "$count"
      }
    },
    {
     "$sort" : [
                {
                    "name" : "count",
                    "direction" : -1
                }
            ]
    }
  ]
}

You can see more examples here: http://docs.redash.io/en/latest/usage/mongodb_querying.html

[mderazon]

Getting the same error

{
  "collection": "places",
  "aggregate": [
    {
      "$group": {
        "_id": {"place_id": "$place_id", "place_name": "$place_name"},
        "count": { "$sum": 1 }
      }
    },
    {
      "$project": {
        "_id": "$_id.place_id",
        "name": "$_id.place_name",
        "count": "$count"
      }
    },
    {
      "$sort": {
        "count": -1
      }
    }
  ]
}

Fails on on the $sort operation with the same error message. (If I remove $sort it works fine) Works fine in mongo shell

re:dash 0.9.1+b1377