{
modelBuilder.Ignore<Author>();
}

if (!isRuntime)
{
     modelBuilder.Ignore<Author>();
}

public void ConfigureServices(IServiceCollection services)
{
     //other things that are irrelevant
     var connectionString = Startup.Configuration["connectionStrings:conStrExpress"];
     services.AddScoped<IResearchCreationsRepository, ResearchCreationsRepository>();
     services.AddDbContext<ResearchCreationsContext>(o => o.UseSqlServer(connectionString));
}

public class ResearchCreationsContext: DbContext
    {
        public bool isRuntime { get; set; } = false;
        public DbSet<Research> Research { get; set; }
        public DbSet<SearchedCreations> SearchedCreations { get; set; }

        public ResearchCreationsContext(DbContextOptions<ResearchCreationsContext> options)
            : base(options)
        {
            Database.Migrate();
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            if (!isRuntime)
            {
                modelBuilder.Ignore<SearchedCreations>();
            }
        }
    }