MongoDB id remains null after InsertOneAsync -

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i have base class entity has string id member , derived class a.

but when creating new instance of derived class , using insertoneasync add collection, document added database null id value.

using objectid id seem work, i'm trying prevent mongodb dependency in models.

i experimented following code, results same:

bsonclassmap.registerclassmap<entity>(cm => {     cm.mapidfield(x => x.id).setserializer(new stringserializer(bsontype.objectid)); });

i had same issue , got work (with 2.0 driver) these attributes:

[bsonid] [bsonrepresentation(bsontype.objectid)] [bsonignoreifdefault]

or equivalent bsonclassmap fluent interface:

bsonclassmap.registerclassmap<entity>(cm => {       cm.mapidfield(x => x.id)       .setserializer(new stringserializer(bsontype.objectid))       .setignoreifdefault(true); });

i tried same working .replaceoneasync upsert on leaves id still null


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