在查找表和EF中映射其他属性

Question

I have the following many-to-many relationship set up in my db.

Mapped using Code-First EF; A Ticket has an ICollection of Branch and vice versa.

This all works fine but now I need to make a significant change since the spec has been fleshed out.

Originally a single Ticket could be marked as IsRead but that, as a concept, only really works when the Ticket is allocated to a single branch. What I need to do is say that a Ticket has been read at each individual Branch .

Now my first thought is that I should change the relational table BranchTickets so that it has an Identity column and the IsRead property thus creating a one-to-many relationship but I don't know then how to map the two foreign keys using the Code-First Api.

Would this be the right approach, and if so how would I go about ensuring EF maps the tables appropriately?

Answer 1

If a Ticket can only be deemed read at Branch level, then I would say all you need to do is remove the IsRead property from Ticket and move it to BranchTickets .

This means each individual ticket can be associated with multiple branches which can have different read states.

how would I go about ensuring EF maps the tables appropriately

This is a change you would need to make at DB level, you can then update your EF model.