pymongo嵌套嵌入式文档字段更新

Question

I have a document as:

{
    "name": "restaurant 1",
    "rooms":
        [
            {"name": "room1",
                "desks": [
                    {
                        "name": "desk1",
                        "unique": "abcde",
                        "busy": False
                    },
                    {
                        "name": "desk2",
                        "unique": "abcdf",
                        "busy": True
                    }
                ]},
            {"name": "room2",
                "desks": [
                    {
                        "name": "desk1",
                        "unique": "bbcde",
                        "busy": False
                    },
                    {
                        "name": "desk2",
                        "unique": "bbcdf",
                        "busy": False
                    }
                ]}
        ]
}

My pymongo search query:

db.restaurants.update(
  {'rooms.desks.unique': 'bbcdf')},
  {'$set': {'rooms.$.desks.$$.busy': True}}
)

I couldn't update "busy" field of the desk. $$ part didn't work. What should I replace "$$" with?

or

How can I find the index of the desk.

Thanks in advance

Answer 1

According to documentation it's not possible:

The positional $ operator cannot be used for queries which traverse more than one array, such as queries that traverse arrays nested within other arrays, because the replacement for the $ placeholder is a single value.

Most likely you will need to redesign your database schema.