Rename all correction commands.

app/Console/Commands/Correction/RemovesEmptyGroups.php

@@ -0,0 +1,70 @@
+<?php
+
+/**
+ * DeleteEmptyGroups.php
+ * Copyright (c) 2020 james@firefly-iii.org
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Console\Commands\Correction;
+
+use Exception;
+use FireflyIII\Console\Commands\ShowsFriendlyMessages;
+use FireflyIII\Models\TransactionGroup;
+use Illuminate\Console\Command;
+
+/**
+ * Class DeleteEmptyGroups
+ */
+class RemovesEmptyGroups extends Command
+{
+    use ShowsFriendlyMessages;
+
+    protected $description = 'Delete empty transaction groups.';
+    protected $signature   = 'firefly-iii:delete-empty-groups';
+
+    /**
+     * Execute the console command.
+     *
+     * @throws Exception;
+     */
+    public function handle(): int
+    {
+        $groupIds
+               = TransactionGroup::leftJoin('transaction_journals', 'transaction_groups.id', '=', 'transaction_journals.transaction_group_id')
+                   ->whereNull('transaction_journals.id')->get(['transaction_groups.id'])->pluck('id')->toArray()
+        ;
+
+        $total = count($groupIds);
+        if ($total > 0) {
+            $this->friendlyInfo(sprintf('Deleted %d empty transaction group(s).', $total));
+
+            // again, chunks for SQLite.
+            $chunks = array_chunk($groupIds, 500);
+            foreach ($chunks as $chunk) {
+                TransactionGroup::whereNull('deleted_at')->whereIn('id', $chunk)->delete();
+            }
+        }
+        if (0 === $total) {
+            $this->friendlyInfo('Verified there are no empty groups.');
+        }
+
+        return 0;
+    }
+}