Initial commit: breakpilot-lehrer - Lehrer KI Platform
Services: Admin-Lehrer, Backend-Lehrer, Studio v2, Website, Klausur-Service, School-Service, Voice-Service, Geo-Service, BreakPilot Drive, Agent-Core Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Benjamin Boenisch
646
school-service/internal/services/grade_service.go
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646
school-service/internal/services/grade_service.go
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@@ -0,0 +1,646 @@
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package services
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import (
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"context"
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"github.com/breakpilot/school-service/internal/models"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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// GradeService handles grade-related operations
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type GradeService struct {
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db *pgxpool.Pool
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}
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// NewGradeService creates a new GradeService
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func NewGradeService(db *pgxpool.Pool) *GradeService {
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return &GradeService{db: db}
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}
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// GetGradeOverview returns grade overview for a class
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func (s *GradeService) GetGradeOverview(ctx context.Context, classID string, semester int) ([]models.GradeOverview, error) {
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rows, err := s.db.Query(ctx, `
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SELECT go.id, go.student_id, go.subject_id, go.school_year_id, go.semester,
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go.written_grade_avg, go.written_grade_count, go.oral_grade, go.oral_notes,
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go.final_grade, go.final_grade_locked, go.written_weight, go.oral_weight,
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go.created_at, go.updated_at,
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CONCAT(st.first_name, ' ', st.last_name) as student_name,
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sub.name as subject_name
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FROM grade_overview go
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JOIN students st ON go.student_id = st.id
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JOIN subjects sub ON go.subject_id = sub.id
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WHERE st.class_id = $1 AND go.semester = $2
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ORDER BY st.last_name, st.first_name, sub.name
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`, classID, semester)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var grades []models.GradeOverview
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for rows.Next() {
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var g models.GradeOverview
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if err := rows.Scan(&g.ID, &g.StudentID, &g.SubjectID, &g.SchoolYearID, &g.Semester, &g.WrittenGradeAvg, &g.WrittenGradeCount, &g.OralGrade, &g.OralNotes, &g.FinalGrade, &g.FinalGradeLocked, &g.WrittenWeight, &g.OralWeight, &g.CreatedAt, &g.UpdatedAt, &g.StudentName, &g.SubjectName); err != nil {
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return nil, err
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}
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grades = append(grades, g)
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}
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return grades, nil
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}
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// GetStudentGrades returns all grades for a student
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func (s *GradeService) GetStudentGrades(ctx context.Context, studentID string) ([]models.GradeOverview, error) {
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rows, err := s.db.Query(ctx, `
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SELECT go.id, go.student_id, go.subject_id, go.school_year_id, go.semester,
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go.written_grade_avg, go.written_grade_count, go.oral_grade, go.oral_notes,
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go.final_grade, go.final_grade_locked, go.written_weight, go.oral_weight,
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go.created_at, go.updated_at,
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CONCAT(st.first_name, ' ', st.last_name) as student_name,
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sub.name as subject_name
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FROM grade_overview go
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JOIN students st ON go.student_id = st.id
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JOIN subjects sub ON go.subject_id = sub.id
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WHERE go.student_id = $1
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ORDER BY go.school_year_id DESC, go.semester DESC, sub.name
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`, studentID)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var grades []models.GradeOverview
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for rows.Next() {
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var g models.GradeOverview
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if err := rows.Scan(&g.ID, &g.StudentID, &g.SubjectID, &g.SchoolYearID, &g.Semester, &g.WrittenGradeAvg, &g.WrittenGradeCount, &g.OralGrade, &g.OralNotes, &g.FinalGrade, &g.FinalGradeLocked, &g.WrittenWeight, &g.OralWeight, &g.CreatedAt, &g.UpdatedAt, &g.StudentName, &g.SubjectName); err != nil {
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return nil, err
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}
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grades = append(grades, g)
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}
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return grades, nil
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}
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// UpdateOralGrade updates the oral grade for a student in a subject
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func (s *GradeService) UpdateOralGrade(ctx context.Context, studentID, subjectID string, req *models.UpdateOralGradeRequest) (*models.GradeOverview, error) {
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// First, get or create the grade overview record
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var grade models.GradeOverview
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// Try to get the current school year and semester
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var schoolYearID string
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err := s.db.QueryRow(ctx, `
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SELECT sy.id FROM school_years sy
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JOIN classes c ON c.school_year_id = sy.id
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JOIN students st ON st.class_id = c.id
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WHERE st.id = $1 AND sy.is_current = true
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LIMIT 1
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`, studentID).Scan(&schoolYearID)
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if err != nil {
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// No current school year found, cannot update
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return nil, err
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}
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// Current semester (simplified - could be calculated from date)
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semester := 1
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err = s.db.QueryRow(ctx, `
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INSERT INTO grade_overview (student_id, subject_id, school_year_id, semester, oral_grade, oral_notes)
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VALUES ($1, $2, $3, $4, $5, $6)
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ON CONFLICT (student_id, subject_id, school_year_id, semester) DO UPDATE SET
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oral_grade = EXCLUDED.oral_grade,
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oral_notes = EXCLUDED.oral_notes,
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updated_at = NOW()
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RETURNING id, student_id, subject_id, school_year_id, semester, written_grade_avg, written_grade_count, oral_grade, oral_notes, final_grade, final_grade_locked, written_weight, oral_weight, created_at, updated_at
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`, studentID, subjectID, schoolYearID, semester, req.OralGrade, req.OralNotes).Scan(
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&grade.ID, &grade.StudentID, &grade.SubjectID, &grade.SchoolYearID, &grade.Semester, &grade.WrittenGradeAvg, &grade.WrittenGradeCount, &grade.OralGrade, &grade.OralNotes, &grade.FinalGrade, &grade.FinalGradeLocked, &grade.WrittenWeight, &grade.OralWeight, &grade.CreatedAt, &grade.UpdatedAt,
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)
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return &grade, err
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}
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// CalculateFinalGrades calculates final grades for all students in a class
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func (s *GradeService) CalculateFinalGrades(ctx context.Context, classID string, semester int) error {
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// Update written grade averages from approved exam results
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_, err := s.db.Exec(ctx, `
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WITH avg_grades AS (
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SELECT er.student_id, e.subject_id, AVG(er.grade) as avg_grade, COUNT(*) as grade_count
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FROM exam_results er
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JOIN exams e ON er.exam_id = e.id
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JOIN students st ON er.student_id = st.id
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WHERE st.class_id = $1 AND er.approved_by_teacher = true AND er.grade IS NOT NULL
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GROUP BY er.student_id, e.subject_id
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)
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UPDATE grade_overview go SET
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written_grade_avg = ag.avg_grade,
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written_grade_count = ag.grade_count,
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updated_at = NOW()
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FROM avg_grades ag
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WHERE go.student_id = ag.student_id AND go.subject_id = ag.subject_id AND go.semester = $2
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`, classID, semester)
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if err != nil {
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return err
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}
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// Calculate final grades based on weights
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_, err = s.db.Exec(ctx, `
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UPDATE grade_overview SET
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final_grade = CASE
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WHEN oral_grade IS NULL THEN written_grade_avg
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WHEN written_grade_avg IS NULL THEN oral_grade
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ELSE ROUND((written_grade_avg * written_weight + oral_grade * oral_weight) / (written_weight + oral_weight), 1)
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END,
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updated_at = NOW()
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WHERE student_id IN (SELECT id FROM students WHERE class_id = $1)
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AND semester = $2
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AND final_grade_locked = false
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`, classID, semester)
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return err
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}
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// TransferApprovedGrades transfers approved exam results to grade overview
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func (s *GradeService) TransferApprovedGrades(ctx context.Context, teacherID string) error {
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// Get current school year
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var schoolYearID string
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err := s.db.QueryRow(ctx, `
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SELECT id FROM school_years WHERE teacher_id = $1 AND is_current = true LIMIT 1
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`, teacherID).Scan(&schoolYearID)
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if err != nil {
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return err
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}
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// Current semester
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semester := 1
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// Ensure grade_overview records exist for all students with approved results
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_, err = s.db.Exec(ctx, `
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INSERT INTO grade_overview (student_id, subject_id, school_year_id, semester)
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SELECT DISTINCT er.student_id, e.subject_id, $1, $2
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FROM exam_results er
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JOIN exams e ON er.exam_id = e.id
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WHERE er.approved_by_teacher = true AND e.subject_id IS NOT NULL
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ON CONFLICT (student_id, subject_id, school_year_id, semester) DO NOTHING
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`, schoolYearID, semester)
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return err
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}
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// LockFinalGrade locks a final grade (prevents further changes)
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func (s *GradeService) LockFinalGrade(ctx context.Context, studentID, subjectID string, semester int) error {
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_, err := s.db.Exec(ctx, `
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UPDATE grade_overview SET final_grade_locked = true, updated_at = NOW()
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WHERE student_id = $1 AND subject_id = $2 AND semester = $3
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`, studentID, subjectID, semester)
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return err
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}
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// UpdateGradeWeights updates the written/oral weights for grade calculation
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func (s *GradeService) UpdateGradeWeights(ctx context.Context, studentID, subjectID string, writtenWeight, oralWeight int) error {
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_, err := s.db.Exec(ctx, `
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UPDATE grade_overview SET written_weight = $3, oral_weight = $4, updated_at = NOW()
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WHERE student_id = $1 AND subject_id = $2
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`, studentID, subjectID, writtenWeight, oralWeight)
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return err
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}
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// =============================================
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// STATISTICS METHODS
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// =============================================
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// ClassStatistics holds statistics for a class
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type ClassStatistics struct {
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ClassID string `json:"class_id"`
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ClassName string `json:"class_name"`
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StudentCount int `json:"student_count"`
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ClassAverage float64 `json:"class_average"`
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GradeDistribution map[string]int `json:"grade_distribution"`
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BestGrade float64 `json:"best_grade"`
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WorstGrade float64 `json:"worst_grade"`
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PassRate float64 `json:"pass_rate"`
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StudentsAtRisk int `json:"students_at_risk"`
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SubjectAverages map[string]float64 `json:"subject_averages"`
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}
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// SubjectStatistics holds statistics for a subject within a class
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type SubjectStatistics struct {
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ClassID string `json:"class_id"`
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SubjectID string `json:"subject_id"`
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SubjectName string `json:"subject_name"`
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StudentCount int `json:"student_count"`
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Average float64 `json:"average"`
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Median float64 `json:"median"`
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GradeDistribution map[string]int `json:"grade_distribution"`
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BestGrade float64 `json:"best_grade"`
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WorstGrade float64 `json:"worst_grade"`
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PassRate float64 `json:"pass_rate"`
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ExamAverages []ExamAverage `json:"exam_averages"`
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}
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// ExamAverage holds average for a single exam
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type ExamAverage struct {
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ExamID string `json:"exam_id"`
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Title string `json:"title"`
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Average float64 `json:"average"`
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ExamDate string `json:"exam_date"`
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}
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// StudentStatistics holds statistics for a single student
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type StudentStatistics struct {
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StudentID string `json:"student_id"`
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StudentName string `json:"student_name"`
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OverallAverage float64 `json:"overall_average"`
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SubjectGrades map[string]float64 `json:"subject_grades"`
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Trend string `json:"trend"` // "improving", "stable", "declining"
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AbsenceDays int `json:"absence_days"`
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ExamsCompleted int `json:"exams_completed"`
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StrongestSubject string `json:"strongest_subject"`
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WeakestSubject string `json:"weakest_subject"`
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}
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// Notenspiegel represents grade distribution
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type Notenspiegel struct {
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ClassID string `json:"class_id"`
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SubjectID string `json:"subject_id,omitempty"`
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ExamID string `json:"exam_id,omitempty"`
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Title string `json:"title"`
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Distribution map[string]int `json:"distribution"`
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Total int `json:"total"`
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Average float64 `json:"average"`
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PassRate float64 `json:"pass_rate"`
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}
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// GetClassStatistics returns statistics for a class
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func (s *GradeService) GetClassStatistics(ctx context.Context, classID string, semester int) (*ClassStatistics, error) {
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stats := &ClassStatistics{
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ClassID: classID,
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GradeDistribution: make(map[string]int),
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SubjectAverages: make(map[string]float64),
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}
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// Initialize grade distribution
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for i := 1; i <= 6; i++ {
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stats.GradeDistribution[string('0'+rune(i))] = 0
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}
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// Get class info and student count
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err := s.db.QueryRow(ctx, `
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SELECT c.name, COUNT(s.id)
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FROM classes c
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LEFT JOIN students s ON s.class_id = c.id
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WHERE c.id = $1
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GROUP BY c.name
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`, classID).Scan(&stats.ClassName, &stats.StudentCount)
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if err != nil {
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return nil, err
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}
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// Build semester condition
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semesterCond := ""
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if semester > 0 {
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semesterCond = " AND go.semester = " + string('0'+rune(semester))
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}
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// Get overall statistics from grade_overview
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var avgGrade, bestGrade, worstGrade float64
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var totalPassed, totalStudents int
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err = s.db.QueryRow(ctx, `
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SELECT
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COALESCE(AVG(go.final_grade), 0),
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COALESCE(MIN(go.final_grade), 0),
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COALESCE(MAX(go.final_grade), 0),
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COUNT(CASE WHEN go.final_grade <= 4.0 THEN 1 END),
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COUNT(go.id)
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FROM grade_overview go
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JOIN students s ON s.id = go.student_id
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WHERE s.class_id = $1 AND go.final_grade IS NOT NULL`+semesterCond+`
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`, classID).Scan(&avgGrade, &bestGrade, &worstGrade, &totalPassed, &totalStudents)
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if err == nil {
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stats.ClassAverage = avgGrade
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stats.BestGrade = bestGrade
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stats.WorstGrade = worstGrade
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if totalStudents > 0 {
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stats.PassRate = float64(totalPassed) / float64(totalStudents) * 100
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}
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}
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// Get grade distribution
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rows, err := s.db.Query(ctx, `
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SELECT FLOOR(go.final_grade) as grade_bucket, COUNT(*) as count
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FROM grade_overview go
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JOIN students s ON s.id = go.student_id
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WHERE s.class_id = $1 AND go.final_grade IS NOT NULL`+semesterCond+`
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GROUP BY FLOOR(go.final_grade)
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`, classID)
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if err == nil {
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defer rows.Close()
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for rows.Next() {
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var bucket int
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var count int
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if err := rows.Scan(&bucket, &count); err == nil && bucket >= 1 && bucket <= 6 {
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stats.GradeDistribution[string('0'+rune(bucket))] = count
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}
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}
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}
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// Count students at risk
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s.db.QueryRow(ctx, `
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SELECT COUNT(DISTINCT s.id)
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FROM students s
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JOIN grade_overview go ON go.student_id = s.id
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WHERE s.class_id = $1 AND go.final_grade >= 4.5
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`, classID).Scan(&stats.StudentsAtRisk)
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// Get subject averages
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subjectRows, err := s.db.Query(ctx, `
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SELECT sub.name, AVG(go.final_grade)
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FROM grade_overview go
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JOIN subjects sub ON sub.id = go.subject_id
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JOIN students s ON s.id = go.student_id
|
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WHERE s.class_id = $1 AND go.final_grade IS NOT NULL`+semesterCond+`
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GROUP BY sub.name
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`, classID)
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if err == nil {
|
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defer subjectRows.Close()
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for subjectRows.Next() {
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var name string
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var avg float64
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if err := subjectRows.Scan(&name, &avg); err == nil {
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stats.SubjectAverages[name] = avg
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}
|
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}
|
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}
|
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return stats, nil
|
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}
|
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|
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// GetSubjectStatistics returns statistics for a specific subject in a class
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func (s *GradeService) GetSubjectStatistics(ctx context.Context, classID, subjectID string, semester int) (*SubjectStatistics, error) {
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stats := &SubjectStatistics{
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ClassID: classID,
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SubjectID: subjectID,
|
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GradeDistribution: make(map[string]int),
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ExamAverages: []ExamAverage{},
|
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}
|
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|
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// Initialize grade distribution
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for i := 1; i <= 6; i++ {
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stats.GradeDistribution[string('0'+rune(i))] = 0
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}
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// Get subject name and basic stats
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semesterCond := ""
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if semester > 0 {
|
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semesterCond = " AND go.semester = " + string('0'+rune(semester))
|
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}
|
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err := s.db.QueryRow(ctx, `
|
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SELECT
|
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sub.name,
|
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COUNT(DISTINCT s.id),
|
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COALESCE(AVG(go.final_grade), 0),
|
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COALESCE(MIN(go.final_grade), 0),
|
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COALESCE(MAX(go.final_grade), 0),
|
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COUNT(CASE WHEN go.final_grade <= 4.0 THEN 1 END),
|
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COUNT(go.id)
|
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FROM grade_overview go
|
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JOIN subjects sub ON sub.id = go.subject_id
|
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JOIN students s ON s.id = go.student_id
|
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WHERE s.class_id = $1 AND go.subject_id = $2 AND go.final_grade IS NOT NULL`+semesterCond+`
|
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GROUP BY sub.name
|
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`, classID, subjectID).Scan(
|
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&stats.SubjectName, &stats.StudentCount, &stats.Average,
|
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&stats.BestGrade, &stats.WorstGrade,
|
||||
new(int), new(int), // We'll calculate pass rate separately
|
||||
)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Get grade distribution
|
||||
rows, err := s.db.Query(ctx, `
|
||||
SELECT FLOOR(go.final_grade), COUNT(*)
|
||||
FROM grade_overview go
|
||||
JOIN students s ON s.id = go.student_id
|
||||
WHERE s.class_id = $1 AND go.subject_id = $2 AND go.final_grade IS NOT NULL`+semesterCond+`
|
||||
GROUP BY FLOOR(go.final_grade)
|
||||
`, classID, subjectID)
|
||||
if err == nil {
|
||||
defer rows.Close()
|
||||
var passed, total int
|
||||
for rows.Next() {
|
||||
var bucket, count int
|
||||
if err := rows.Scan(&bucket, &count); err == nil && bucket >= 1 && bucket <= 6 {
|
||||
stats.GradeDistribution[string('0'+rune(bucket))] = count
|
||||
total += count
|
||||
if bucket <= 4 {
|
||||
passed += count
|
||||
}
|
||||
}
|
||||
}
|
||||
if total > 0 {
|
||||
stats.PassRate = float64(passed) / float64(total) * 100
|
||||
}
|
||||
}
|
||||
|
||||
// Get exam averages
|
||||
examRows, err := s.db.Query(ctx, `
|
||||
SELECT e.id, e.title, AVG(er.grade), COALESCE(e.exam_date::text, '')
|
||||
FROM exams e
|
||||
JOIN exam_results er ON er.exam_id = e.id
|
||||
JOIN students s ON er.student_id = s.id
|
||||
WHERE s.class_id = $1 AND e.subject_id = $2 AND er.grade IS NOT NULL
|
||||
GROUP BY e.id, e.title, e.exam_date
|
||||
ORDER BY e.exam_date DESC NULLS LAST
|
||||
`, classID, subjectID)
|
||||
if err == nil {
|
||||
defer examRows.Close()
|
||||
for examRows.Next() {
|
||||
var ea ExamAverage
|
||||
if err := examRows.Scan(&ea.ExamID, &ea.Title, &ea.Average, &ea.ExamDate); err == nil {
|
||||
stats.ExamAverages = append(stats.ExamAverages, ea)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return stats, nil
|
||||
}
|
||||
|
||||
// GetStudentStatistics returns statistics for a specific student
|
||||
func (s *GradeService) GetStudentStatistics(ctx context.Context, studentID string) (*StudentStatistics, error) {
|
||||
stats := &StudentStatistics{
|
||||
StudentID: studentID,
|
||||
SubjectGrades: make(map[string]float64),
|
||||
}
|
||||
|
||||
// Get student name
|
||||
err := s.db.QueryRow(ctx, `
|
||||
SELECT CONCAT(first_name, ' ', last_name) FROM students WHERE id = $1
|
||||
`, studentID).Scan(&stats.StudentName)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Get subject grades and calculate overall average
|
||||
var totalGrade, numSubjects float64
|
||||
var bestGrade float64 = 6
|
||||
var worstGrade float64 = 1
|
||||
var bestSubject, worstSubject string
|
||||
|
||||
rows, err := s.db.Query(ctx, `
|
||||
SELECT sub.name, go.final_grade
|
||||
FROM grade_overview go
|
||||
JOIN subjects sub ON sub.id = go.subject_id
|
||||
WHERE go.student_id = $1 AND go.final_grade IS NOT NULL
|
||||
ORDER BY sub.name
|
||||
`, studentID)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer rows.Close()
|
||||
|
||||
for rows.Next() {
|
||||
var name string
|
||||
var grade float64
|
||||
if err := rows.Scan(&name, &grade); err == nil {
|
||||
stats.SubjectGrades[name] = grade
|
||||
totalGrade += grade
|
||||
numSubjects++
|
||||
if grade < bestGrade {
|
||||
bestGrade = grade
|
||||
bestSubject = name
|
||||
}
|
||||
if grade > worstGrade {
|
||||
worstGrade = grade
|
||||
worstSubject = name
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if numSubjects > 0 {
|
||||
stats.OverallAverage = totalGrade / numSubjects
|
||||
stats.StrongestSubject = bestSubject
|
||||
stats.WeakestSubject = worstSubject
|
||||
}
|
||||
|
||||
// Count exams completed
|
||||
s.db.QueryRow(ctx, `
|
||||
SELECT COUNT(*) FROM exam_results WHERE student_id = $1 AND grade IS NOT NULL
|
||||
`, studentID).Scan(&stats.ExamsCompleted)
|
||||
|
||||
// Count absence days
|
||||
s.db.QueryRow(ctx, `
|
||||
SELECT COALESCE(SUM(periods), 0) FROM attendance
|
||||
WHERE student_id = $1 AND status IN ('absent_excused', 'absent_unexcused')
|
||||
`, studentID).Scan(&stats.AbsenceDays)
|
||||
|
||||
// Determine trend (simplified - compare first and last exam grades)
|
||||
stats.Trend = "stable"
|
||||
var firstGrade, lastGrade float64
|
||||
s.db.QueryRow(ctx, `
|
||||
SELECT grade FROM exam_results
|
||||
WHERE student_id = $1 AND grade IS NOT NULL
|
||||
ORDER BY created_at ASC LIMIT 1
|
||||
`, studentID).Scan(&firstGrade)
|
||||
s.db.QueryRow(ctx, `
|
||||
SELECT grade FROM exam_results
|
||||
WHERE student_id = $1 AND grade IS NOT NULL
|
||||
ORDER BY created_at DESC LIMIT 1
|
||||
`, studentID).Scan(&lastGrade)
|
||||
|
||||
if lastGrade < firstGrade-0.5 {
|
||||
stats.Trend = "improving"
|
||||
} else if lastGrade > firstGrade+0.5 {
|
||||
stats.Trend = "declining"
|
||||
}
|
||||
|
||||
return stats, nil
|
||||
}
|
||||
|
||||
// GetNotenspiegel returns grade distribution (Notenspiegel)
|
||||
func (s *GradeService) GetNotenspiegel(ctx context.Context, classID, subjectID, examID string, semester int) (*Notenspiegel, error) {
|
||||
ns := &Notenspiegel{
|
||||
ClassID: classID,
|
||||
SubjectID: subjectID,
|
||||
ExamID: examID,
|
||||
Distribution: make(map[string]int),
|
||||
}
|
||||
|
||||
// Initialize distribution
|
||||
for i := 1; i <= 6; i++ {
|
||||
ns.Distribution[string('0'+rune(i))] = 0
|
||||
}
|
||||
|
||||
var query string
|
||||
var args []interface{}
|
||||
|
||||
if examID != "" {
|
||||
// Notenspiegel for specific exam
|
||||
query = `
|
||||
SELECT e.title, FLOOR(er.grade), COUNT(*), AVG(er.grade)
|
||||
FROM exam_results er
|
||||
JOIN exams e ON e.id = er.exam_id
|
||||
WHERE er.exam_id = $1 AND er.grade IS NOT NULL
|
||||
GROUP BY e.title, FLOOR(er.grade)
|
||||
`
|
||||
args = []interface{}{examID}
|
||||
} else if subjectID != "" {
|
||||
// Notenspiegel for subject in class
|
||||
semesterCond := ""
|
||||
if semester > 0 {
|
||||
semesterCond = " AND go.semester = " + string('0'+rune(semester))
|
||||
}
|
||||
query = `
|
||||
SELECT sub.name, FLOOR(go.final_grade), COUNT(*), AVG(go.final_grade)
|
||||
FROM grade_overview go
|
||||
JOIN subjects sub ON sub.id = go.subject_id
|
||||
JOIN students s ON s.id = go.student_id
|
||||
WHERE s.class_id = $1 AND go.subject_id = $2 AND go.final_grade IS NOT NULL` + semesterCond + `
|
||||
GROUP BY sub.name, FLOOR(go.final_grade)
|
||||
`
|
||||
args = []interface{}{classID, subjectID}
|
||||
} else {
|
||||
// Notenspiegel for entire class
|
||||
semesterCond := ""
|
||||
if semester > 0 {
|
||||
semesterCond = " AND go.semester = " + string('0'+rune(semester))
|
||||
}
|
||||
query = `
|
||||
SELECT c.name, FLOOR(go.final_grade), COUNT(*), AVG(go.final_grade)
|
||||
FROM grade_overview go
|
||||
JOIN students s ON s.id = go.student_id
|
||||
JOIN classes c ON c.id = s.class_id
|
||||
WHERE s.class_id = $1 AND go.final_grade IS NOT NULL` + semesterCond + `
|
||||
GROUP BY c.name, FLOOR(go.final_grade)
|
||||
`
|
||||
args = []interface{}{classID}
|
||||
}
|
||||
|
||||
rows, err := s.db.Query(ctx, query, args...)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer rows.Close()
|
||||
|
||||
var passed int
|
||||
for rows.Next() {
|
||||
var title string
|
||||
var bucket, count int
|
||||
var avg float64
|
||||
if err := rows.Scan(&title, &bucket, &count, &avg); err == nil {
|
||||
ns.Title = title
|
||||
if bucket >= 1 && bucket <= 6 {
|
||||
ns.Distribution[string('0'+rune(bucket))] = count
|
||||
ns.Total += count
|
||||
if bucket <= 4 {
|
||||
passed += count
|
||||
}
|
||||
}
|
||||
ns.Average = avg
|
||||
}
|
||||
}
|
||||
|
||||
if ns.Total > 0 {
|
||||
ns.PassRate = float64(passed) / float64(ns.Total) * 100
|
||||
}
|
||||
|
||||
return ns, nil
|
||||
}
|
||||
Reference in New Issue
Block a user