cek proposal periode

app/Http/Controllers/Mahasiswa/ProposalController.php

@@ -73,6 +73,13 @@ class ProposalController extends Controller
                               ->where('kirim', '1')
                               ->first();
 
+        $cekproposal  = Proposal::where('created_user', auth()->user()->id)
+                                ->where('periode_id', $periode->periode_id)
+                                ->first();
+        if($cekproposal) {
+            return redirect()->route('mahasiswa.proposal.index')->with('warning', 'Sudah ada Proposal yang di ajukan!');
+        }
+
         if(is_null($kelompok)){
 
             return redirect()->route('mahasiswa.proposal.index')->with('warning', 'Belum ada kelompok!');