Mongodb 2dsphere不允许空几何体

有吗 对于mongodb中的2dsphere几何索引?

mongodb能阻止存储 几何图形(空列表,空dict)?

测试用例:

$ mongo
MongoDB shell version v4.0.6
...
> use geotest
switched to db geotest
> db.places.createIndex({'geometry': '2dsphere'})
{
        "createdCollectionAutomatically" : true,
        "numIndexesBefore" : 1,
        "numIndexesAfter" : 2,
        "ok" : 1
}

……到目前为止还不错。

> db.places.insert({'geometry': [[]]})  // this fails -> good
WriteResult({
        "nInserted" : 0,
        "writeError" : {
                "code" : 16755,
                "errmsg" : "Can't extract geo keys: { _id: ObjectId('5c8a483bcebc3f30972cb9ea'), geometry: [ [] ] }  Point must only contain numeric elements"
        }
})

…很高兴这次失败了,但是:

> db.places.insert({'geometry': []})    // can I make mongo fail here too?
WriteResult({ "nInserted" : 1 })
> db.places.insert({'geometry': {}})    // and here?
WriteResult({ "nInserted" : 1 })
> db.places.insert({'geometry': null})  // how about this one?
WriteResult({ "nInserted" : 1 })
> db.places.find()
{ "_id" : ObjectId("5c8a4840cebc3f30972cb9eb"), "geometry" : [ ] }
{ "_id" : ObjectId("5c8a4843cebc3f30972cb9ec"), "geometry" : {  } }
{ "_id" : ObjectId("5c8a4b23cebc3f30972cb9ee"), "geometry" : null }