InsertOneAsync(..) How do I get the ObjectId after insertion

[Jürgen Stolz]

Hi,

• MongoDb >3.0
  
• Driver > 2.01 (async)

After an insertion I want to return the object  extended with the automatically generated ObjectId. How do I get this value?

Some source code

        public static Task Insert_Temp(DBContentBase insertObject)

        {

            if (insertObject.DBVersion != 0)

            {

                throw new Exception("Insert not allowed");

            }

            insertObject.Created = DateTimeOffset.Now;

            insertObject.Updated = insertObject.Created;

            insertObject.DBVersion = 1; 

            var collection = mongoDatabase.GetCollection<BsonDocument>(insertObject.GetType().Name);

            Task insertOneAsync = collection.InsertOneAsync(insertObject.ToBsonDocument());

            insertOneAsync.Wait();

            return insertOneAsync;

        }

The Task is finished but I didn´t find the Id.

Regards Jürgen

[Craig Wilson]

The inserted object will have been mutated to include the identifier. Is that not the case?

[Jürgen Stolz]

No the ObjectId in from the object (DBContentBase insertObject) I insert is still empty and in the Task object after the wait() I did not find the Id. In the Database itself the object is inserted with a generated id.

I insert a Person

Source snippets of the classes:

    public class DBContentBase

    {

        public ObjectId Id { get; set; }

        public int DBVersion { get; set; }

        public DateTimeOffset Created { get; set; }

        public DateTimeOffset Updated { get; set; }

    } 

   public class Person : DBContentBase

    {

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public string Info { get; set; }

        public string Concatenated { get; set; }

        public DateTimeOffset DateOfBirth { get; set; }

        public DateTimeOffset Marriage { get; set; }

        public int Age { get; set; }

        public string Profession { get; set; }

[Craig Wilson]

If that is true, then it's a bug. Please file an issue at http://jira.mongodb.org under the CSHARP project with a reproducible sample and we'll get it fixed.

[Jürgen Stolz]

I created the jira.

CSHARP-1421 Missing the generated ObjectId after inserting an object

Regards

Jürgen

[Jürgen Stolz]

I found the reason

Sorry please close the jira. After changing the Class.Type from BsonDocument to the real Class.Type DBContentBase (in the Insert(...) method it worked. 

[Craig Wilson]

Thanks Jürgen,

I'm glad you found the problem.

Craig