Fix #1996

app/Repositories/Budget/BudgetRepository.php

@@ -37,6 +37,7 @@ use FireflyIII\Models\Transaction;
 use FireflyIII\Models\TransactionCurrency;
 use FireflyIII\Models\TransactionType;
 use FireflyIII\Repositories\Account\AccountRepositoryInterface;
+use FireflyIII\Services\Internal\Destroy\BudgetDestroyService;
 use FireflyIII\User;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Support\Collection;
@@ -185,11 +186,9 @@ class BudgetRepository implements BudgetRepositoryInterface
      */
     public function destroy(Budget $budget): bool
     {
-        try {
-            $budget->delete();
-        } catch (Exception $e) {
-            Log::error(sprintf('Could not delete budget: %s', $e->getMessage()));
-        }
+        /** @var BudgetDestroyService $service */
+        $service = app(BudgetDestroyService::class);
+        $service->destroy($budget);
 
         return true;
     }

app/Services/Internal/Destroy/BudgetDestroyService.php

@@ -0,0 +1,63 @@
+<?php
+/**
+ * BudgetDestroyService.php
+ * Copyright (c) 2019 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III.
+ *
+ * Firefly III is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Firefly III 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Services\Internal\Destroy;
+
+use DB;
+use Exception;
+use FireflyIII\Models\Budget;
+use Log;
+
+/**
+ * Class BudgetDestroyService
+ */
+class BudgetDestroyService
+{
+    /**
+     * Constructor.
+     */
+    public function __construct()
+    {
+        if ('testing' === config('app.env')) {
+            Log::warning(sprintf('%s should not be instantiated in the TEST environment!', \get_class($this)));
+        }
+    }
+
+    /**
+     * @param Budget $budget
+     */
+    public function destroy(Budget $budget): void
+    {
+        try {
+            $budget->delete();
+        } catch (Exception $e) { // @codeCoverageIgnore
+            Log::error(sprintf('Could not delete budget: %s', $e->getMessage())); // @codeCoverageIgnore
+        }
+
+        // also delete all relations between categories and transaction journals:
+        DB::table('budget_transaction_journal')->where('budget_id', (int)$budget->id)->delete();
+
+        // also delete all relations between categories and transactions:
+        DB::table('budget_transaction')->where('budget_id', (int)$budget->id)->delete();
+    }
+}

app/Services/Internal/Destroy/CategoryDestroyService.php

@@ -23,6 +23,7 @@ declare(strict_types=1);
 
 namespace FireflyIII\Services\Internal\Destroy;
 
+use DB;
 use Exception;
 use FireflyIII\Models\Category;
 use Log;
@@ -52,5 +53,11 @@ class CategoryDestroyService
         } catch (Exception $e) { // @codeCoverageIgnore
             Log::error(sprintf('Could not delete category: %s', $e->getMessage())); // @codeCoverageIgnore
         }
+
+        // also delete all relations between categories and transaction journals:
+        DB::table('category_transaction_journal')->where('category_id', (int)$category->id)->delete();
+
+        // also delete all relations between categories and transactions:
+        DB::table('category_transaction')->where('category_id', (int)$category->id)->delete();
     }
 }