fix course creation linkage to sub-categories

Allow course creation payloads to include sub_category_id and persist it so newly created language paths appear in unified hierarchy views.

Made-with: Cursor

gen/db/compat_course_management.go

@@ -2,6 +2,8 @@ package dbgen
 
 import (
 	"context"
+
+	"github.com/jackc/pgx/v5/pgtype"
 )
 
 func (q *Queries) GetSubModuleByIDCompat(ctx context.Context, id int64) (SubModule, error) {
@@ -111,3 +113,56 @@ func (q *Queries) DeletePracticeCompat(ctx context.Context, id int64) error {
 	_, err := q.db.Exec(ctx, `DELETE FROM question_sets WHERE id = $1`, id)
 	return err
 }
+
+func (q *Queries) CreateCourseCompat(
+	ctx context.Context,
+	categoryID int64,
+	subCategoryID *int64,
+	title string,
+	description string,
+	thumbnail string,
+	introVideoURL string,
+	isActive bool,
+) (Course, error) {
+	row := q.db.QueryRow(ctx, `
+INSERT INTO courses (
+    category_id,
+    sub_category_id,
+    title,
+    description,
+    thumbnail,
+    intro_video_url,
+    is_active
+)
+VALUES (
+    $1,
+    $2,
+    $3,
+    NULLIF($4, ''),
+    NULLIF($5, ''),
+    NULLIF($6, ''),
+    $7
+)
+RETURNING id, category_id, title, description, is_active, thumbnail, intro_video_url, display_order, sub_category_id
+`, categoryID, subCategoryID, title, description, thumbnail, introVideoURL, isActive)
+
+	var i Course
+	err := row.Scan(
+		&i.ID,
+		&i.CategoryID,
+		&i.Title,
+		&i.Description,
+		&i.IsActive,
+		&i.Thumbnail,
+		&i.IntroVideoUrl,
+		&i.DisplayOrder,
+		&i.SubCategoryID,
+	)
+	if err != nil {
+		return Course{}, err
+	}
+	if !i.SubCategoryID.Valid {
+		i.SubCategoryID = pgtype.Int8{Valid: false}
+	}
+	return i, nil
+}

internal/web_server/handlers/hierarchy_handler.go

@@ -25,6 +25,7 @@ type createCourseCategoryReq struct {
 
 type createCourseReq struct {
 	CategoryID    int64   `json:"category_id"`
+	SubCategoryID *int64  `json:"sub_category_id"`
 	Title         string  `json:"title"`
 	Description   *string `json:"description"`
 	Thumbnail     *string `json:"thumbnail"`
@@ -238,14 +239,33 @@ func (h *Handler) CreateCourse(c *fiber.Ctx) error {
 		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{Message: "category_id and title are required"})
 	}
 
-	created, err := h.analyticsDB.CreateCourse(c.Context(), dbgen.CreateCourseParams{
+	isActive := true
-		CategoryID:    req.CategoryID,
+	if req.IsActive != nil {
-		Title:         req.Title,
+		isActive = *req.IsActive
-		Description:   toText(req.Description),
+	}
-		Thumbnail:     toText(req.Thumbnail),
+	description := ""
-		IntroVideoUrl: toText(req.IntroVideoURL),
+	if req.Description != nil {
-		Column6:       boolOrNil(req.IsActive),
+		description = *req.Description
-	})
+	}
+	thumbnail := ""
+	if req.Thumbnail != nil {
+		thumbnail = *req.Thumbnail
+	}
+	introVideoURL := ""
+	if req.IntroVideoURL != nil {
+		introVideoURL = *req.IntroVideoURL
+	}
+
+	created, err := h.analyticsDB.CreateCourseCompat(
+		c.Context(),
+		req.CategoryID,
+		req.SubCategoryID,
+		req.Title,
+		description,
+		thumbnail,
+		introVideoURL,
+		isActive,
+	)
 	if err != nil {
 		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{Message: "Failed to create course", Error: err.Error()})
 	}