预演

2026-07-27 12:20:29 +08:00
parent 727a429abf
commit 33ae991e86
16 changed files with 7117 additions and 8 deletions
@@ -22,6 +22,7 @@ public sealed class AppDbContext(DbContextOptions<AppDbContext> options)
    public DbSet<Student> Students => Set<Student>();
    public DbSet<CourseCategory> CourseCategories => Set<CourseCategory>();
    public DbSet<Course> Courses => Set<Course>();
+    public DbSet<CoursePrerequisite> CoursePrerequisites => Set<CoursePrerequisite>();
    public DbSet<CurriculumPlan> CurriculumPlans => Set<CurriculumPlan>();
    public DbSet<CurriculumModule> CurriculumModules => Set<CurriculumModule>();
    public DbSet<CurriculumCourse> CurriculumCourses => Set<CurriculumCourse>();
@@ -247,6 +248,20 @@ public sealed class AppDbContext(DbContextOptions<AppDbContext> options)
                .OnDelete(DeleteBehavior.Restrict);
        });

+        builder.Entity<CoursePrerequisite>(entity =>
+        {
+            entity.HasIndex(x => new { x.CourseId, x.PrerequisiteCourseId })
+                .IsUnique();
+            entity.HasOne(x => x.Course)
+                .WithMany(x => x.Prerequisites)
+                .HasForeignKey(x => x.CourseId)
+                .OnDelete(DeleteBehavior.Cascade);
+            entity.HasOne(x => x.PrerequisiteCourse)
+                .WithMany(x => x.RequiredByCourses)
+                .HasForeignKey(x => x.PrerequisiteCourseId)
+                .OnDelete(DeleteBehavior.Restrict);
+        });
+
        builder.Entity<CurriculumPlan>(entity =>
        {
            entity.Property(x => x.Name).HasMaxLength(120);