core v1

server/internal/db/courses.go

@@ -0,0 +1,85 @@
+package db
+
+import (
+	"server/internal/models"
+
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+type ClassCourseDTO struct {
+	ID         int64  `json:"id"`
+	Name       string `json:"name"`
+	CourseCode string `json:"courseCode"`
+}
+
+func UpsertClassCourses(db *gorm.DB, classRkID int64, items []ClassCourseDTO) error {
+	if len(items) == 0 {
+		return nil
+	}
+	rows := make([]models.ClassCourse, 0, len(items))
+	for _, it := range items {
+		if it.ID <= 0 {
+			continue
+		}
+		rows = append(rows, models.ClassCourse{
+			ClassRkID:  classRkID,
+			CourseRkID: it.ID,
+			Name:       it.Name,
+			CourseCode: it.CourseCode,
+		})
+	}
+	if len(rows) == 0 {
+		return nil
+	}
+	return db.Clauses(clause.OnConflict{
+		Columns:   []clause.Column{{Name: "class_rk_id"}, {Name: "course_rk_id"}},
+		DoUpdates: clause.AssignmentColumns([]string{"name", "course_code", "updated_at"}),
+	}).Create(&rows).Error
+}
+
+func ListClassCourses(db *gorm.DB, classRkID int64) ([]ClassCourseDTO, error) {
+	var rows []models.ClassCourse
+	if err := db.Where("class_rk_id = ?", classRkID).Order("name asc").Find(&rows).Error; err != nil {
+		return nil, err
+	}
+	out := make([]ClassCourseDTO, 0, len(rows))
+	for _, r := range rows {
+		out = append(out, ClassCourseDTO{
+			ID:         r.CourseRkID,
+			Name:       r.Name,
+			CourseCode: r.CourseCode,
+		})
+	}
+	return out, nil
+}
+
+func MergeClassCourses(base []ClassCourseDTO, extra []ClassCourseDTO) []ClassCourseDTO {
+	merged := make(map[int64]ClassCourseDTO, len(base)+len(extra))
+	for _, c := range base {
+		if c.ID > 0 {
+			merged[c.ID] = c
+		}
+	}
+	for _, c := range extra {
+		if c.ID <= 0 {
+			continue
+		}
+		if existing, ok := merged[c.ID]; ok {
+			if c.Name != "" {
+				existing.Name = c.Name
+			}
+			if c.CourseCode != "" {
+				existing.CourseCode = c.CourseCode
+			}
+			merged[c.ID] = existing
+		} else {
+			merged[c.ID] = c
+		}
+	}
+	out := make([]ClassCourseDTO, 0, len(merged))
+	for _, c := range merged {
+		out = append(out, c)
+	}
+	return out
+}