Many-to-many relationship left and right keys flipped after Entity Framework 5 upgrade

Question

I have some code that saves a many to many relationship in code. It was working fine with Entity Framework 4.1 but after updating to Entity Framework 5, it\'s failing.

Answer 1

I can confirm this is a bug in EF5, although I'm still not sure how it worked in 4.3.1.

The problem is that we are not correctly associating the LeftKey/RightKey calls with their corresponding navigation properties.

I will file an EF6 bug over on our CodePlex project site.

To workaround, I think you will need to either:

1. Configure the association from one side only. Or,
2. Switch the LeftKey/RightKey columns names to be the same in both configurations.

Sorry for the inconvenience.

UPDATE: Here is the bug.