delete group transaction

app/Models/Group.php

@@ -3,11 +3,28 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 class Group extends Model
 {
-	public function transaction()
+	public function transactions()
     {
-        return $this->belongsToMany('App\Models\Transaction', 'group_transaction');
+        return $this->belongsToMany(Transaction::class, GroupTransaction::class);
+    }
+
+    /**
+     * @return BelongsTo
+     */
+    public function currency(): BelongsTo
+    {
+        return $this->BelongsTo(Currency::class, 'currency_id', 'id');
+    }
+
+    /**
+     * @return BelongsTo
+     */
+    public function original_currency(): BelongsTo
+    {
+        return $this->BelongsTo(Currency::class, 'original_currency_id', 'id');
     }
 }

app/Models/GroupTransaction.php

@@ -3,8 +3,25 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 class GroupTransaction extends Model
 {
-    //
+    protected $table = 'group_transactions';
+    
+    /**
+     * @return BelongsTo
+     */
+    public function group(): BelongsTo
+    {
+        return $this->BelongsTo(Group::class, 'group_id', 'id');
+    }
+
+    /**
+     * @return BelongsTo
+     */
+    public function transaction(): BelongsTo
+    {
+        return $this->BelongsTo(Transaction::class, 'transaction_id', 'id');
+    }
 }