Здравейте.

Получавам следната грешка при опит на домашното за Entity Relations

System.InvalidOperationException: 'Unable to determine the relationship represented by navigation property 'Course.StudentsEnrolled' of type 'ICollection<Student>'. Either manually configure the relationship, or ignore this property using the '[NotMapped]' attribute or by using 'EntityTypeBuilder.Ignore'.

Явно нещо някъде съм объркал и не мога да намеря какво. Вече няколко пъти го преглеждам...

Ако някой хване грешката ще съм благодарен.

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace P01_StudentSystem.Data.Models
{
    public class Student
    {
        public Student()
        {
            this.CourseEnrollments = new HashSet<Course>();
            this.HomeworkSubmissions = new HashSet<Homework>();
        }

        public int StudentId { get; set; }

        [Required]
        [MaxLength(100)]
        public string Name { get; set; }

        [Column(TypeName = "char(10)")]
        public string PhoneNumber { get; set; }

        public DateTime RegisteredOn { get; set; }

        public DateTime? Birthday { get; set; }

        public ICollection<Course> CourseEnrollments { get; set; }

        public ICollection<Homework> HomeworkSubmissions { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace P01_StudentSystem.Data.Models
{
    public class Course
    {

        public Course()
        {
            this.StudentsEnrolled = new HashSet<Student>();
            this.Resources = new HashSet<Resource>();
            this.HomeworkSubmissions = new HashSet<Homework>();
        }
        public int CourseId { get; set; }

        [Required]
        [MaxLength(180)]
        public string Name { get; set; }

        public string Description { get; set; }

        public DateTime StartDate { get; set; }

        public DateTime EndDate { get; set; }

        public decimal Price { get; set; }

        public ICollection<Student> StudentsEnrolled { get; set; }

        public ICollection<Resource> Resources { get; set; }

        public ICollection<Homework> HomeworkSubmissions { get; set; }

    }
}

namespace P01_StudentSystem.Data.Models
{
    public class StudentCourse
    {
        public int CourseId { get; set; }

        public Course Course { get; set; }

        public int StudentId { get; set; }

        public Student Student { get; set; }

    }
}

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;
using P01_StudentSystem.Data.Models;

namespace P01_StudentSystem.Data
{
    public partial class StudentSystemContext : DbContext
    {
        public StudentSystemContext()
        {
        }

        public StudentSystemContext(DbContextOptions<StudentSystemContext> options)
            : base(options)
        {
        }

        public DbSet<Student> Students { get; set; }
        public DbSet<Course> Courses { get; set; }
        public DbSet<Resource> Resources { get; set; }
        public DbSet<Homework> Homeworks { get; set; }
        public DbSet<StudentCourse> StudentsCourses { get; set; }


        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
            {
                optionsBuilder.UseSqlServer("Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=P01_StudentSystem;Integrated Security=True");
            }

            base.OnConfiguring(optionsBuilder);

        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<StudentCourse>(x =>
                {
                    x.HasKey(x => new { x.CourseId, x.StudentId });
                });

            base.OnModelCreating(modelBuilder);
        }
    }
}