Entity Framework Core - Knowledge Base (KB)

Create an optional foreign key using the fluid-API for Entity Framework 7

I'm trying to create an optional foreign key using Entity Framework 7 and the Fluid-API. In EF v6.x we had the option to add this using ....WithOptional... or ....HasOptional..., but I cant find any equivalent functionality in EF 7.. any ideas?...Br, Inx