BUG FIX && 权限验证

src/app/(dashboard)/teacher/classes/my/page.tsx

@@ -1,5 +1,9 @@
+import { eq } from "drizzle-orm"
 import { getTeacherClasses } from "@/modules/classes/data-access"
 import { MyClassesGrid } from "@/modules/classes/components/my-classes-grid"
+import { auth } from "@/auth"
+import { db } from "@/shared/db"
+import { grades } from "@/shared/db/schema"
 
 export const dynamic = "force-dynamic"
 
@@ -9,6 +13,16 @@ export default function MyClassesPage() {
 
 async function MyClassesPageImpl() {
   const classes = await getTeacherClasses()
+  const session = await auth()
+  const role = String(session?.user?.role ?? "")
+  const userId = String(session?.user?.id ?? "").trim()
+
+  const canCreateClass = await (async () => {
+    if (role === "admin") return true
+    if (!userId) return false
+    const [row] = await db.select({ id: grades.id }).from(grades).where(eq(grades.gradeHeadId, userId)).limit(1)
+    return Boolean(row)
+  })()
 
   return (
     <div className="flex h-full flex-col space-y-8 p-8">
@@ -21,7 +35,7 @@ async function MyClassesPageImpl() {
         </div>
       </div>
 
-      <MyClassesGrid classes={classes} />
+      <MyClassesGrid classes={classes} canCreateClass={canCreateClass} />
     </div>
   )
 }