using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Entities.Contracts
{
	[Table("textbook")]
	public class Textbook
	{
		[Key]
		public Guid Id { get; set; }

		public GradeEnum Grade { get; set; } = GradeEnum.Unknown;

		public string Title { get; set; } = string.Empty;

		public Publisher Publisher { get; set; } = Publisher.部编版;

		public SubjectAreaEnum SubjectArea { get; set; } = SubjectAreaEnum.Unknown;

		[InverseProperty(nameof(Lesson.Textbook))]
		public ICollection<Lesson> Lessons { get; set; }

		public Textbook()
		{
			Id = Guid.NewGuid();
			Lessons = new HashSet<Lesson>();
		}
	}

}