重构项目结构，移除Assignment相关功能，优化Submission模块

Entities/Contracts/User.cs

@@ -3,47 +3,57 @@ using System.ComponentModel.DataAnnotations.Schema;
 
 namespace Entities.Contracts
 {
-	public enum UserRoles 
-	{
-		Student,
-		Teacher,
-		Administrator
-	}
 
 	public class User : IdentityUser<Guid>
 	{
 		public string? RefreshToken { get; set; }
+
 		public DateTime? RefreshTokenExpiryTime { get; set; }
-		public string? Address { get; set; }	
+		
+		public string? HomeAddress { get; set; }
+
 		public string? DisplayName { get; set; }
-		public SubjectAreaEnum SubjectArea { get; set; } = SubjectAreaEnum.Unknown;
+
+		public UserRoles? Role { get; set; } 
+
+		public Guid? TeachSubjectId { get; set; }
+		[ForeignKey(nameof(TeachSubjectId))]
+		public virtual Subject? TeachSubject { get; set; }
 
 		[Column("deleted")]
 		public bool IsDeleted { get; set; }
+		
+		[InverseProperty(nameof(ClassUser.User))]
+		public virtual ICollection<ClassUser> UserInjoinedClass { get; set; }
 
-		[InverseProperty(nameof(ClassTeacher.Teacher))]
-		public ICollection<ClassTeacher> TaughtClassesLink { get; set; }
-		[InverseProperty(nameof(ClassStudent.Student))]
-		public ICollection<ClassStudent> EnrolledClassesLink { get; set; }
+		//[InverseProperty(nameof(Question.Creator))]
+		//public virtual ICollection<Question> CreatedQuestions { get; set; }
+
+		[InverseProperty(nameof(Exam.Creator))]
+		public virtual ICollection<Exam> CreatedExams { get; set; }
+
+		[InverseProperty(nameof(SubmissionDetail.Student))]
+		public virtual ICollection<SubmissionDetail> SubmissionDetails { get; set; }
+
+		[InverseProperty(nameof(Submission.Student))]
+		public virtual ICollection<Submission> StudentSubmissions { get; set; }
+
+		[InverseProperty(nameof(Submission.Grader))]
+		public virtual ICollection<Submission> GradedSubmissions { get; set; }
 
-		public ICollection<Question> CreatedQuestions { get; set; }
-		public ICollection<Assignment> CreatedAssignments { get; set; }
 
-		public ICollection<SubmissionDetail> SubmissionDetails { get; set; }
-		public ICollection<Submission> SubmissionsAsStudent { get; set; }
-		public ICollection<Submission> GradedSubmissions { get; set; }
 
 		public User()
 		{
 			Id = Guid.NewGuid();
 			SecurityStamp = Guid.NewGuid().ToString();
 
-			CreatedQuestions = new HashSet<Question>();
-			TaughtClassesLink = new HashSet<ClassTeacher>();
-			EnrolledClassesLink = new HashSet<ClassStudent>();
-			CreatedAssignments = new HashSet<Assignment>();
+			//CreatedQuestions = new HashSet<Question>();
+			UserInjoinedClass = new HashSet<ClassUser>();
+			CreatedExams = new HashSet<Exam>();
 			GradedSubmissions = new HashSet<Submission>();
-			SubmissionsAsStudent = new HashSet<Submission>();
+			StudentSubmissions = new HashSet<Submission>();
+			SubmissionDetails = new HashSet<SubmissionDetail>();
 		}
 	}
 }