实验成绩计算

src/Jiaowu.Api/Infrastructure/Persistence/AppDbContext.cs

@@ -58,6 +58,8 @@ public sealed class AppDbContext(DbContextOptions<AppDbContext> options)
         Set<ExperimentGradeItem>();
     public DbSet<ExperimentGradeRecord> ExperimentGradeRecords =>
         Set<ExperimentGradeRecord>();
+    public DbSet<ExperimentCourseGrade> ExperimentCourseGrades =>
+        Set<ExperimentCourseGrade>();
     public DbSet<ExperimentGradeItemScore> ExperimentGradeItemScores =>
         Set<ExperimentGradeItemScore>();
     public DbSet<CourseSelectionRound> CourseSelectionRounds =>
@@ -795,6 +797,21 @@ public sealed class AppDbContext(DbContextOptions<AppDbContext> options)
                 .OnDelete(DeleteBehavior.Restrict);
         });
 
+        builder.Entity<ExperimentCourseGrade>(entity =>
+        {
+            entity.Property(x => x.WeightedAverageScore).HasPrecision(5, 1);
+            entity.Property(x => x.TotalWeight).HasPrecision(8, 1);
+            entity.HasIndex(x => new { x.TeachingTaskId, x.StudentId })
+                .IsUnique();
+            entity.HasIndex(x => x.StudentId);
+            entity.HasOne(x => x.TeachingTask).WithMany()
+                .HasForeignKey(x => x.TeachingTaskId)
+                .OnDelete(DeleteBehavior.Cascade);
+            entity.HasOne(x => x.Student).WithMany()
+                .HasForeignKey(x => x.StudentId)
+                .OnDelete(DeleteBehavior.Restrict);
+        });
+
         builder.Entity<ExperimentGradeItemScore>(entity =>
         {
             entity.HasKey(x => new