UpdateGraph fails if PrimaryKey is nullable in Entity POCO, but not null in database about graphdiff HOT 2 CLOSED

(I should perhaps mention that the above scenario is motivated by the desire to clearly know the difference between a new entity and a persisted entity within the POCO object model. With a nullable id, it will default to null when an object is "newed up" clearly communicating that this is a non-persisted entity. However, an entity retrieved from entity framework will always have a non-null id).

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I had a quick look at this, the expression is created at DbContextExtensions.cs:282. The comparison is written in an Expression and I can't assume a type for the Id. So it's going to be hard to know what to convert it to to ensure equality. Perhaps I can check to see if one is a Nullable and convert the other so that they are even. I'll look into this soon.

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