Introduce new model for future remodeling of split transactions.

app/Models/TransactionGroup.php

@@ -0,0 +1,100 @@
+<?php
+/**
+ * TransactionGroup.php
+ * Copyright (c) 2017 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\Models;
+
+use FireflyIII\User;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\SoftDeletes;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+
+/**
+ * Class TransactionGroup.
+ */
+class TransactionGroup extends Model
+{
+    use SoftDeletes;
+
+    /**
+     * The attributes that should be casted to native types.
+     *
+     * @var array
+     */
+    protected $casts
+        = [
+            'created_at' => 'datetime',
+            'updated_at' => 'datetime',
+            'deleted_at' => 'datetime',
+            'title'      => 'string',
+        ];
+
+    /** @var array Fields that can be filled */
+    protected $fillable
+        = ['user_id', 'title'];
+
+    /**
+     * Route binder. Converts the key in the URL to the specified object (or throw 404).
+     *
+     * @param string $value
+     *
+     * @return TransactionGroup
+     * @throws NotFoundHttpException
+     */
+    public static function routeBinder(string $value): TransactionGroup
+    {
+        if (auth()->check()) {
+            $groupId = (int)$value;
+            /** @var User $user */
+            $user = auth()->user();
+            /** @var TransactionGroup $group */
+            $group = $user->transactionGroups()->where('transaction_groups.id', $groupId)
+                          ->first(['transaction_groups.*']);
+            if (null !== $group) {
+                return $group;
+            }
+        }
+
+        throw new NotFoundHttpException;
+    }
+
+    /**
+     * @codeCoverageIgnore
+     * @return BelongsToMany
+     */
+    public function transactionJournals(): BelongsToMany
+    {
+        return $this->belongsToMany(TransactionJournal::class);
+    }
+
+    /**
+     * @codeCoverageIgnore
+     * @return BelongsTo
+     */
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+}