Adopt SummerCMS v0.1.1 admin features

Datepickers on native time.Time / lagoon.Date fields, file uploads on
materials, readings and class sessions managed from the course form
(course_id made nullable).

updates/20261002234500_make_course_id_nullable.go

@@ -0,0 +1,27 @@
+package updates
+
+import (
+	"github.com/go-gormigrate/gormigrate/v2"
+	"gorm.io/gorm"
+)
+
+// MakeCourseIDNullable returns the 20261002234500_make_course_id_nullable
+// gormigrate entry: class sessions and readings may have no course while
+// the course form that creates them is not saved yet. The relation managers
+// on the course form hold such rows in deferred_bindings, and the first save
+// of the course sets course_id; deferred:purge deletes abandoned ones.
+func MakeCourseIDNullable() *gormigrate.Migration {
+	return &gormigrate.Migration{
+		ID: "20261002234500_make_course_id_nullable",
+		Migrate: func(tx *gorm.DB) error {
+			return execAll(tx, `ALTER TABLE jz_bm_class_sessions ALTER COLUMN course_id DROP NOT NULL;
+ALTER TABLE jz_bm_readings ALTER COLUMN course_id DROP NOT NULL`)
+		},
+		Rollback: func(tx *gorm.DB) error {
+			return execAll(tx, `DELETE FROM jz_bm_class_sessions WHERE course_id IS NULL;
+DELETE FROM jz_bm_readings WHERE course_id IS NULL;
+ALTER TABLE jz_bm_class_sessions ALTER COLUMN course_id SET NOT NULL;
+ALTER TABLE jz_bm_readings ALTER COLUMN course_id SET NOT NULL`)
+		},
+	}
+}