Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths - why?

Question

I\'ve been wrestling with this for a while and can\'t quite figure out what\'s happening. I have a Card entity which contains Sides (usually 2) - and both Cards and Sides h

Answer 1

The existing answers are great I just wanted to add that I ran into this error because of a different reason. I wanted to create an Initial EF migration on an existing DB but I didn't use the -IgnoreChanges flag and applied the Update-Database command on an empty Database (also on the existing fails).

Instead I had to run this command when the current db structure is the current one:

Add-Migration Initial -IgnoreChanges

There is likely a real problem in the db structure but save the world one step at a time...