完整性更新

现在已经实现了大部分基础功能

src/app/(dashboard)/teacher/homework/assignments/page.tsx

@@ -12,13 +12,28 @@ import {
 } from "@/shared/components/ui/table"
 import { formatDate } from "@/shared/lib/utils"
 import { getHomeworkAssignments } from "@/modules/homework/data-access"
+import { getTeacherClasses } from "@/modules/classes/data-access"
 import { PenTool, PlusCircle } from "lucide-react"
 
 export const dynamic = "force-dynamic"
 
-export default async function AssignmentsPage() {
-  const assignments = await getHomeworkAssignments()
+type SearchParams = { [key: string]: string | string[] | undefined }
+
+const getParam = (params: SearchParams, key: string) => {
+  const v = params[key]
+  return Array.isArray(v) ? v[0] : v
+}
+
+export default async function AssignmentsPage({ searchParams }: { searchParams: Promise<SearchParams> }) {
+  const sp = await searchParams
+  const classId = getParam(sp, "classId") || undefined
+
+  const [assignments, classes] = await Promise.all([
+    getHomeworkAssignments({ classId: classId && classId !== "all" ? classId : undefined }),
+    classId && classId !== "all" ? getTeacherClasses() : Promise.resolve([]),
+  ])
   const hasAssignments = assignments.length > 0
+  const className = classId && classId !== "all" ? classes.find((c) => c.id === classId)?.name : undefined
 
   return (
     <div className="h-full flex-1 flex-col space-y-8 p-8 md:flex">
@@ -26,25 +41,41 @@ export default async function AssignmentsPage() {
         <div>
           <h2 className="text-2xl font-bold tracking-tight">Assignments</h2>
           <p className="text-muted-foreground">
-            Manage homework assignments.
+            {classId && classId !== "all" ? `Filtered by class: ${className ?? classId}` : "Manage homework assignments."}
           </p>
         </div>
-        <Button asChild>
-          <Link href="/teacher/homework/assignments/create">
-            <PlusCircle className="mr-2 h-4 w-4" />
-            Create Assignment
-          </Link>
-        </Button>
+        <div className="flex items-center gap-2">
+          {classId && classId !== "all" ? (
+            <Button asChild variant="outline">
+              <Link href="/teacher/homework/assignments">Clear filter</Link>
+            </Button>
+          ) : null}
+          <Button asChild>
+            <Link
+              href={
+                classId && classId !== "all"
+                  ? `/teacher/homework/assignments/create?classId=${encodeURIComponent(classId)}`
+                  : "/teacher/homework/assignments/create"
+              }
+            >
+              <PlusCircle className="mr-2 h-4 w-4" />
+              Create Assignment
+            </Link>
+          </Button>
+        </div>
       </div>
 
       {!hasAssignments ? (
         <EmptyState
           title="No assignments"
-          description="You haven't created any assignments yet."
+          description={classId && classId !== "all" ? "No assignments for this class yet." : "You haven't created any assignments yet."}
           icon={PenTool}
           action={{
             label: "Create Assignment",
-            href: "/teacher/homework/assignments/create",
+            href:
+              classId && classId !== "all"
+                ? `/teacher/homework/assignments/create?classId=${encodeURIComponent(classId)}`
+                : "/teacher/homework/assignments/create",
           }}
         />
       ) : (