EF Core DbContext in separate library

I was designing an ASP.NET core application with a layered architecture, and decided to keep my DbContext in a separate class library project.
This is normal in layered architecture right?. But when i tried to create migration got some strange error.

After some googling i found that we need to add below code in our library , when our DbContext and models are in separate class library.

Add below code in the library where your DbContext is, Here MyDbContext is the name of DbContext.

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;

namespace DataLayer
{
    public class MyContextFactory : IDesignTimeDbContextFactory<MyDbContext>
    {
        public MyDbContext CreateDbContext(string[] args)
        {
            var builder = new DbContextOptionsBuilder<MyDbContext>();
            builder.UseSqlServer("Server=MyServer;Database=MyDatabase;Trusted_Connection=True;MultipleActiveResultSets=true");
            return new MyDbContext(builder.Options);
        }
    }
}