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1. What would you like to communicate to the user about this feature?
2. Would you like the user to see examples of the syntax and/or executable code and its output?
3. Which versions of the driver/connector does this apply to?

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1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

When using the insertOne function in the C# driver, in case we initialize an array with {{new[]

{obj, obj, obj}

}}. The _t Discriminator is missing in the DB.

for example:

collection.InsertOne(new Parent { Children = new[] { new Child() } });

will save to DB:

{"_id":"5bf6aef6c0beccc414b70d45","Child":[{}]}

The problem does not happen when using List

collection.InsertOne(new Parent { Children = new List<IChild> { new Child() } });

will insert into DB:

{    "_id":"5bf6b074c0beccc414b70dc2",    "Children":[{"_t":"Child"}]}

for further information please check this StackOverflow question: