Type is not a valid type to map

If the mongo db set type is an interface i.e. MongoDbSet<IMyInterfaceType> it throws an error.

Type is not a valid type to map (Parameter 'entityType')

Is there an example of how I can set this up? Some of my collection types are concrete though have properties that are interface types.

[Turnerj]

This is another case of “kinda”. If you were lookkng for a specific type, you can use OfType<YourInheritedType>() on your LINQ query to get it. It can have some weirdness still but you’ll be hitting more edge cases of the driver itself.

This kinda deserialization control is basically what the MongoDB driver gives us. Under certain other situations, I do hijack it a bit to make it smarter (see the section in the readme about runtime type discovery) but outside of that, it is whatever the driver does.

In theory, I could try and hijack it further to use similar smartness to directly do what you’re suggesting on an entity by entity basis but that’s gonna take a lot of digging into.

[Turnerj]

Currently you can’t specify an interface on the MongoDbSet but you can use a shared base class if there are common properties you want across multiple types.

I haven’t otherwise done a ton of testing how interfaces would behave through MongoFramework and the driver, particularly around discriminators (the _t property in the document).