Honor optional sort_order on course create under a program.

Parses body sort_order, shifts sibling courses in-program, and inserts at the requested slot; omitting it keeps append-after-max behavior. Swagger/sqlc regenerated.

Co-authored-by: Cursor <cursoragent@cursor.com>

db/query/lms_courses.sql

@@ -1,16 +1,17 @@
 -- name: CreateCourse :one
 INSERT INTO courses (program_id, name, description, thumbnail, sort_order)
 SELECT
-    $1,
+    sqlc.arg('program_id'),
-    $2,
+    sqlc.arg('name'),
-    $3,
+    sqlc.arg('description'),
-    $4,
+    sqlc.arg('thumbnail'),
-    coalesce((
+    COALESCE(sqlc.narg('sort_order')::int,
+        COALESCE((
             SELECT
                 max(c.sort_order)
             FROM courses c
             WHERE
-            c.program_id = $1), 0) + 1
+                c.program_id = sqlc.arg('program_id')), 0) + 1)
 RETURNING
     *;
 

docs/docs.go

@@ -4395,7 +4395,7 @@ const docTemplate = `{
                 }
             },
             "post": {
-                "description": "Create a course under a program",
+                "description": "Create a course under a program. Optional sort_order assigns position within that program (siblings shifted); omit to append after the current highest sort_order in the program.",
                 "consumes": [
                     "application/json"
                 ],
@@ -10364,6 +10364,11 @@ const docTemplate = `{
                 "name": {
                     "type": "string"
                 },
+                "sort_order": {
+                    "description": "SortOrder within the program when set; omit to append after current max within program_id (uniqueness is per-program).",
+                    "type": "integer",
+                    "minimum": 0
+                },
                 "thumbnail": {
                     "type": "string"
                 }

docs/swagger.json

@@ -4387,7 +4387,7 @@
                 }
             },
             "post": {
-                "description": "Create a course under a program",
+                "description": "Create a course under a program. Optional sort_order assigns position within that program (siblings shifted); omit to append after the current highest sort_order in the program.",
                 "consumes": [
                     "application/json"
                 ],
@@ -10356,6 +10356,11 @@
                 "name": {
                     "type": "string"
                 },
+                "sort_order": {
+                    "description": "SortOrder within the program when set; omit to append after current max within program_id (uniqueness is per-program).",
+                    "type": "integer",
+                    "minimum": 0
+                },
                 "thumbnail": {
                     "type": "string"
                 }

docs/swagger.yaml

@@ -338,6 +338,11 @@ definitions:
         type: string
       name:
         type: string
+      sort_order:
+        description: SortOrder within the program when set; omit to append after current
+          max within program_id (uniqueness is per-program).
+        minimum: 0
+        type: integer
       thumbnail:
         type: string
     required:
@@ -5372,7 +5377,9 @@ paths:
     post:
       consumes:
       - application/json
-      description: Create a course under a program
+      description: Create a course under a program. Optional sort_order assigns position
+        within that program (siblings shifted); omit to append after the current highest
+        sort_order in the program.
       parameters:
       - description: Program ID
         in: path

gen/db/lms_courses.sql.go

@@ -18,12 +18,13 @@ SELECT
     $2,
     $3,
     $4,
-    coalesce((
+    COALESCE($5::int,
+        COALESCE((
             SELECT
                 max(c.sort_order)
             FROM courses c
             WHERE
-            c.program_id = $1), 0) + 1
+                c.program_id = $1), 0) + 1)
 RETURNING
     id, program_id, name, description, thumbnail, created_at, updated_at, sort_order
 `
@@ -33,6 +34,7 @@ type CreateCourseParams struct {
 	Name        string      `json:"name"`
 	Description pgtype.Text `json:"description"`
 	Thumbnail   pgtype.Text `json:"thumbnail"`
+	SortOrder   pgtype.Int4 `json:"sort_order"`
 }
 
 func (q *Queries) CreateCourse(ctx context.Context, arg CreateCourseParams) (Course, error) {
@@ -41,6 +43,7 @@ func (q *Queries) CreateCourse(ctx context.Context, arg CreateCourseParams) (Cou
 		arg.Name,
 		arg.Description,
 		arg.Thumbnail,
+		arg.SortOrder,
 	)
 	var i Course
 	err := row.Scan(

internal/domain/course.go

@@ -36,6 +36,8 @@ type CreateCourseInput struct {
 	Name        string  `json:"name" validate:"required"`
 	Description *string `json:"description,omitempty"`
 	Thumbnail   *string `json:"thumbnail,omitempty"`
+	// SortOrder within the program when set; omit to append after current max within program_id (uniqueness is per-program).
+	SortOrder *int `json:"sort_order,omitempty" validate:"omitempty,min=0"`
 }
 
 type UpdateCourseInput struct {

internal/repository/lms_courses.go

@@ -29,11 +29,41 @@ func courseToDomain(c dbgen.Course) domain.Course {
 }
 
 func (s *Store) CreateCourse(ctx context.Context, programID int64, input domain.CreateCourseInput) (domain.Course, error) {
+	if input.SortOrder != nil {
+		q, tx, err := s.BeginTx(ctx)
+		if err != nil {
+			return domain.Course{}, err
+		}
+		defer func() { _ = tx.Rollback(ctx) }()
+		target := int32(*input.SortOrder)
+		if _, err := tx.Exec(ctx,
+			`UPDATE courses SET sort_order = sort_order + 1 WHERE program_id = $1 AND sort_order >= $2`,
+			programID, target,
+		); err != nil {
+			return domain.Course{}, err
+		}
+		c, err := q.CreateCourse(ctx, dbgen.CreateCourseParams{
+			ProgramID:   programID,
+			Name:        input.Name,
+			Description: toPgText(input.Description),
+			Thumbnail:   toPgText(input.Thumbnail),
+			SortOrder:   pgtype.Int4{Int32: target, Valid: true},
+		})
+		if err != nil {
+			return domain.Course{}, err
+		}
+		if err := tx.Commit(ctx); err != nil {
+			return domain.Course{}, err
+		}
+		return courseToDomain(c), nil
+	}
+
 	c, err := s.queries.CreateCourse(ctx, dbgen.CreateCourseParams{
 		ProgramID:   programID,
 		Name:        input.Name,
 		Description: toPgText(input.Description),
 		Thumbnail:   toPgText(input.Thumbnail),
+		SortOrder:   pgtype.Int4{Valid: false},
 	})
 	if err != nil {
 		return domain.Course{}, err

internal/web_server/handlers/course_handler.go

@@ -13,7 +13,7 @@ import (
 
 // CreateCourse godoc
 // @Summary Create course
-// @Description Create a course under a program
+// @Description Create a course under a program. Optional sort_order assigns position within that program (siblings shifted); omit to append after the current highest sort_order in the program.
 // @Tags courses
 // @Accept json
 // @Produce json