Challenge: Save Data

using Microsoft.EntityFrameworkCore;
using SaveData.Models.Entities;

namespace SaveData.Models.Data
{
    public class SchoolContext : DbContext
    {
        public SchoolContext()
        {

        }

        public SchoolContext(DbContextOptions<SchoolContext> options) : base(options)
        {

        }

        public virtual DbSet<Instructor> Instructors { get; set; }
        public virtual DbSet<Student> Students { get; set; }
        public virtual DbSet<Department> Departments { get; set; }
        public virtual DbSet<Course> Courses { get; set; }
        public virtual DbSet<StudentCourse> StudentCourses { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {

            if (!optionsBuilder.IsConfigured)
            {
                optionsBuilder.UseSqlite("data source=output/School.db");
            }
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Instructor>()
                        .HasOne(d => d.Department)
                        .WithMany(i => i.Instructors)
                        .HasForeignKey(inst => inst.DepartmentCode);

            modelBuilder.Entity<StudentCourse>().HasKey(sc => new { sc.StudentId, sc.CourseId });

            modelBuilder
                .Entity<StudentCourse>()
                .HasOne(sc => sc.Student)
                .WithMany(s => s.StudentCourses)
                .HasForeignKey(sc => sc.StudentId);

            modelBuilder
                .Entity<StudentCourse>()
                .HasOne(sc => sc.Course)
                .WithMany(c => c.StudentCourses)
                .HasForeignKey(sc => sc.CourseId);
        }

    }
}