gistfile1.cs

public class MyContext : DbContext
{
	public virtual IDbSet<Company> Companies { get; set; }

	protected override void OnModelCreating(DbModelBuilder modelBuilder)
	{
		modelBuilder.Entity<Company>()
			.Map(m => m.Requires("IsDeleted").HasValue(false))
			.Ignore(m => m.IsDeleted);
	}
}