88 lines
2.8 KiB
C#
88 lines
2.8 KiB
C#
using Entities.Contracts;
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using Microsoft.EntityFrameworkCore.Metadata.Builders;
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using Microsoft.EntityFrameworkCore;
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namespace TechHelper.Context.Configuration
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{
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public class SubmissionConfiguration : IEntityTypeConfiguration<Submission>
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{
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public void Configure(EntityTypeBuilder<Submission> builder)
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{
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// 1. 设置表名
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builder.ToTable("submissions");
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// 2. 设置主键
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builder.HasKey(s => s.Id);
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// 3. 配置列名、必需性、精度及其他属性
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// Id
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builder.Property(s => s.Id)
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.HasColumnName("id");
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// AssignmentId
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builder.Property(s => s.AssignmentId)
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.HasColumnName("assignment_id")
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.IsRequired();
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// StudentId
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builder.Property(s => s.StudentId)
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.HasColumnName("student_id")
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.IsRequired();
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builder.Property(s => s.AttemptNumber)
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.HasColumnName("attempt_number")
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.IsRequired();
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builder.Property(s => s.SubmissionTime)
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.HasColumnName("submission_time"); // 没有 [Required] 属性，所以可以是可空的
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builder.Property(s => s.OverallGrade)
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.HasColumnName("overall_grade")
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.HasPrecision(5, 2); // 应用精度设置
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// OverallFeedback
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builder.Property(s => s.OverallFeedback)
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.HasColumnName("overall_feedback");
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// GradedBy (现为 Guid? 类型)
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builder.Property(s => s.GraderId)
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.HasColumnName("graded_by");
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builder.Property(s => s.GradedAt)
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.HasColumnName("graded_at");
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builder.Property(s => s.IsDeleted)
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.HasColumnName("deleted")
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.HasDefaultValue(false);
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builder.Property(s => s.Status)
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.HasColumnName("status")
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.IsRequired()
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.HasMaxLength(15);
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builder.HasOne(s => s.Assignment) // 当前 Submission 有一个 Assignment
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.WithMany(a => a.Submissions) // 那个 Assignment 可以有多个 Submission
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.HasForeignKey(s => s.AssignmentId) // 外键是 Submission.AssignmentId
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.OnDelete(DeleteBehavior.Cascade); // 当 Assignment 被删除时，相关的 Submission 也级联删除。
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builder.HasOne(s => s.Student) // 当前 Submission 有一个 Student (User)
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.WithMany(u => u.SubmissionsAsStudent) // 那个 User (Student) 可以有多个 Submission
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.HasForeignKey(s => s.StudentId) // 外键是 Submission.StudentId
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.OnDelete(DeleteBehavior.Cascade); // 当 User (Student) 被删除时，如果还有其提交的 Submission，则会阻止删除。
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builder.HasOne(s => s.Grader) // 当前 Submission 有一个 Grader (User)，可以是空的
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.WithMany(u => u.GradedSubmissions) // 那个 User (Grader) 可以批改多个 Submission
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.HasForeignKey(s => s.GraderId) // 外键是 Submission.GradedBy
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.OnDelete(DeleteBehavior.SetNull); // 当 User (Grader) 被删除时，如果 GradedBy 是可空的，则将其设置为 NULL。
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}
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}
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}
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