77 lines
3.1 KiB
C#
77 lines
3.1 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 SubmissionDetailConfiguration : IEntityTypeConfiguration<SubmissionDetail>
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{
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public void Configure(EntityTypeBuilder<SubmissionDetail> builder)
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{
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builder.ToTable("submission_details");
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builder.HasKey(sd => sd.Id);
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builder.Property(sd => sd.Id)
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.HasColumnName("id");
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builder.Property(sd => sd.SubmissionId)
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.HasColumnName("submission_id")
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.IsRequired();
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builder.Property(sd => sd.StudentId)
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.HasColumnName("student_id")
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.IsRequired();
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builder.Property(sd => sd.AssignmentQuestionId)
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.HasColumnName("assignment_question_id")
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.IsRequired();
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builder.Property(sd => sd.StudentAnswer)
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.HasColumnName("student_answer"); // string 默认可空
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builder.Property(sd => sd.IsCorrect)
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.HasColumnName("is_correct"); // bool? 默认可空
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builder.Property(sd => sd.PointsAwarded)
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.HasColumnName("points_awarded")
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.HasPrecision(5, 2); // 应用 [Precision(5, 2)] 设置
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builder.Property(sd => sd.TeacherFeedback)
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.HasColumnName("teacher_feedback"); // string 默认可空
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builder.Property(sd => sd.CreatedAt)
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.HasColumnName("created_at")
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.IsRequired()
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.ValueGeneratedOnAdd(); // 在实体首次保存时自动设置值
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builder.Property(sd => sd.UpdatedAt)
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.HasColumnName("updated_at")
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.IsRequired()
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.ValueGeneratedOnAddOrUpdate() // 在实体添加或更新时自动设置值
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.IsConcurrencyToken(); // 用作乐观并发控制，防止同时修改同一记录
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builder.Property(sd => sd.IsDeleted)
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.HasColumnName("deleted")
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.HasDefaultValue(false);
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builder.HasOne(sd => sd.Submission) // 当前 SubmissionDetail 有一个 Submission
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.WithMany(s => s.SubmissionDetails) // 那个 Submission 可以有多个 SubmissionDetail 记录
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.HasForeignKey(sd => sd.SubmissionId) // 外键是 SubmissionDetail.SubmissionId
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.OnDelete(DeleteBehavior.Cascade); // 当 Submission 被删除时，相关的 SubmissionDetail 记录也级联删除。
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builder.HasOne(sd => sd.Student) // 当前 SubmissionDetail 有一个 User (作为学生)
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.WithMany(u => u.SubmissionDetails)
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.HasForeignKey(sd => sd.StudentId) // 外键是 SubmissionDetail.StudentId
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.OnDelete(DeleteBehavior.Restrict); // 当 User (学生) 被删除时，如果他/她还有提交详情，则会阻止删除。
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// 这是一个更安全的选择，以防止意外数据丢失。
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builder.HasOne(sd => sd.AssignmentQuestion) // 当前 SubmissionDetail 有一个 AssignmentQuestion
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.WithMany(aq => aq.SubmissionDetails) // 那个 AssignmentQuestion 可以有多个 SubmissionDetail 记录
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.HasForeignKey(sd => sd.AssignmentQuestionId) // 外键是 SubmissionDetail.AssignmentQuestionId
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.OnDelete(DeleteBehavior.Cascade); // 当 AssignmentQuestion 被删除时，相关的 SubmissionDetail 记录也级联删除。
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}
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}
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}
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