How to relate entities - users with multiple roles
I have 3 entities to represent Users, Roles and Conferences
So far I got this diagram:
So,
-A user can be associated with zero or more conferences.
-A conference may have one or more users.
and...
-The same user can have different roles depending on which conference he is.
but...
-How can I improve the diagram so i can see the different roles of a user in all the conferences he has attended?
[UPDATE]
From your description it sounds like users belong to roles, and then the combination of userRoles belongs to a conference. So, without the fancy diagram, your entities would be something like this...
Users
Id
Roles
Id
Conferences
Id
UserRoles
UserId
RoleId
ConferenceUserRoles
ConferenceId
UserId
RoleId
You may need to add a "UserRoleId" to UserRoles and use that in ConferenceUserRoles. I'm not exactly sure how EF will handle the three-way relation table.
Hope this helps!
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