Can't use migrations in EF Core: “42P07: relation ”AspNetRoles“ already exists”

Question

I have strange issue which I can\'t find solution for.

The stack is: NET Core 2, EF, PostgreSQL. I use .NET Core Identity with User : IdentityUser to ex

Answer 1

The reason was pretty simple. I was calling EnsureCreated in Startup.cs which was getting conflict with migrations as working different way. Thankfully EF Core owners made it clear for me on GitHub.

So to summarize - if you want to use Migrations, you can't use EnsureCreated.

Answer 2

I was doing something really dumb! I copied the connection string from another micro service and it had the wrong Database in the connection string - that database already had the table that the error was complaining about! Block Copy strikes again!