First attempt at displaying a group.

app/Http/Controllers/Transaction/ShowController.php

@@ -0,0 +1,79 @@
+<?php
+/**
+ * ShowController.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\Http\Controllers\Transaction;
+
+
+use FireflyIII\Http\Controllers\Controller;
+use FireflyIII\Models\TransactionGroup;
+use FireflyIII\Models\TransactionJournal;
+use FireflyIII\Repositories\TransactionGroup\TransactionGroupRepositoryInterface;
+
+/**
+ * Class ShowController
+ */
+class ShowController extends Controller
+{
+    /** @var TransactionGroupRepositoryInterface */
+    private $groupRepository;
+
+    /**
+     * SingleController constructor.
+     */
+    public function __construct()
+    {
+        parent::__construct();
+        // some useful repositories:
+        $this->middleware(
+            function ($request, $next) {
+                $this->groupRepository = app(TransactionGroupRepositoryInterface::class);
+
+                app('view')->share('title', (string)trans('firefly.transactions'));
+                app('view')->share('mainTitleIcon', 'fa-repeat');
+
+                return $next($request);
+            }
+        );
+    }
+
+    /**
+     * @param TransactionGroup $transactionGroup
+     *
+     * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
+     */
+    public function show(TransactionGroup $transactionGroup)
+    {
+        /** @var TransactionJournal $first */
+        $first       = $transactionGroup->transactionJournals->first();
+        $groupType   = $first->transactionType->type;
+        $description = $transactionGroup->title;
+        if ($transactionGroup->transactionJournals()->count() > 1) {
+            $description = $first->description;
+        }
+
+        $subTitle = sprintf('%s: "%s"', $groupType, $description);
+
+        return view('transactions.show', compact('transactionGroup', 'subTitle'));
+    }
+
+}