Use temporary negative IDs for rows created in a draft Changeset

app/Http/Controllers/TableController.php

@@ -213,7 +213,7 @@ class TableController extends Controller
         $rowsToInsert = null;
         $rowNumerator = null;
         try {
-            $rowsToInsert = Changeset::csvToRowsArray($columns, $dataCsvLines, true)->all();
+            $rowsToInsert = (new Changeset)->csvToRowsArray($columns, $dataCsvLines, true, false)->all();
         } catch (\Exception $e) {
             return $this->backWithErrors(['data' => $e->getMessage()]);
         }

app/Http/Controllers/TableEditController.php

@@ -334,6 +334,23 @@ class TableEditController extends Controller
      */
     public function draftSubmit(Request $request, User $user, string $table)
     {
+        /** @var Table $tableModel */
+        $tableModel = $user->tables()->where('name', $table)->first();
+        if ($tableModel === null) abort(404, "No such table.");
+
+        $input = $this->validate($request, [
+            'note' => 'required|string'
+        ]);
+
+        $changeset = $this->getChangeset($tableModel);
+        $changeset->note = trim($input->note);
+        if (empty($changeset->note)) throw new SimpleValidationException('note', 'Note is required.');
+
+        if (!$changeset->getRowChangeCounts()->any && !$changeset->getColumnChangeCounts()->any) {
+            flash()->error("There are no changes to submit.");
+            return back();
+        }
+
         //
     }
 }