preparing for proposal composition

app/Http/Controllers/TableController.php

@@ -5,6 +5,7 @@ namespace App\Http\Controllers;
 use App\Models\Revision;
 use App\Models\Table;
 use App\Models\User;
+use App\Tables\Changeset;
 use App\Tables\Column;
 use App\Tables\ColumnNumerator;
 use App\Tables\CStructArrayExporter;
@@ -57,22 +58,29 @@ class TableController extends Controller
     public function draftChange(Request $request, User $user, string $table)
     {
         /** @var Table $tableModel */
-        $tableModel = $user->tables()->with('revision')->where('name', $table)->first();
+        $tableModel = $user->tables()->where('name', $table)->first();
         if ($tableModel === null) abort(404, "No such table.");
 
-        $revision = $tableModel->revision;
+        $session_key = "proposal_{$tableModel->id}";
 
+        /** @var Changeset $changeset */
+        $changeset = $request->session()->remember($session_key, function () use ($tableModel) {
+            $changeset = new Changeset();
+            $changeset->table = $tableModel;
+            $changeset->revision = $tableModel->revision;
+            return $changeset;
+        });
+
+        $revision = $changeset->revision;
         $columns = Column::columnsFromJson($revision->columns);
-
         $rows = $revision->rowsData($columns)->paginate(25, []);
 
-        // TODO instantiate changeset and store it in session
-
-        return view('table.view', [
+        return view('table.propose', [
             'table' => $tableModel,
             'revision' => $revision,
             'columns' => $columns,
             'rows' => $rows,
+            'changeset' => $changeset,
         ]);
     }