Fix is / is not already joined.

app/Models/BaseModel.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * BaseModel.php
+ * Copyright (C) 2016 Sander Dorigo
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace FireflyIII\Models;
+
+use Illuminate\Database\Eloquent\Model;
+/**
+ * Class BaseModel
+ *
+ * @package FireflyIII\Models
+ */
+class BaseModel extends Model
+{
+    /**
+     * @param $query
+     * @param $table
+     *
+     * @return bool
+     */
+    public static function isJoined($query, $table)
+    {
+        $joins = $query->getQuery()->joins;
+        if($joins == null) {
+            return false;
+        }
+        foreach ($joins as $join) {
+            if ($join->table == $table) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

app/Models/TransactionJournal.php

@@ -4,7 +4,6 @@ use Auth;
 use Carbon\Carbon;
 use Crypt;
 use Illuminate\Database\Eloquent\Builder as EloquentBuilder;
-use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\SoftDeletes;
 use Illuminate\Database\Query\JoinClause;
@@ -46,7 +45,7 @@ use Watson\Validating\ValidatingTrait;
  * @method static \Illuminate\Database\Query\Builder|\FireflyIII\Models\TransactionJournal before($date)
  * @method static \Illuminate\Database\Query\Builder|\FireflyIII\Models\TransactionJournal transactionTypes($types)
  */
-class TransactionJournal extends Model
+class TransactionJournal extends BaseModel
 {
     use SoftDeletes, ValidatingTrait;
 
@@ -92,8 +91,6 @@ class TransactionJournal extends Model
             'date'                    => 'required|date',
             'encrypted'               => 'required|boolean',
         ];
-    /** @var bool */
-    private $joinedTypes = false;
 
     /**
      * @param $value
@@ -312,8 +309,9 @@ class TransactionJournal extends Model
     public function scopeExpanded(EloquentBuilder $query)
     {
         // left join transaction type:
-        $query->leftJoin('transaction_types', 'transaction_types.id', '=', 'transaction_journals.transaction_type_id');
+        if (!self::isJoined($query, 'transaction_types')) {
-        $this->joinedTypes = true;
+            $query->leftJoin('transaction_types', 'transaction_types.id', '=', 'transaction_journals.transaction_type_id');
+        }
 
         // left join transaction currency:
         $query->leftJoin('transaction_currencies', 'transaction_currencies.id', '=', 'transaction_journals.transaction_currency_id');
@@ -356,9 +354,8 @@ class TransactionJournal extends Model
     public function scopeTransactionTypes(EloquentBuilder $query, array $types)
     {
 
-        if (!$this->joinedTypes) {
+        if (!self::isJoined($query, 'transaction_types')) {
             $query->leftJoin('transaction_types', 'transaction_types.id', '=', 'transaction_journals.transaction_type_id');
-            $this->joinedTypes = true;
         }
         $query->whereIn('transaction_types.type', $types);
     }

app/Repositories/Category/SingleCategoryRepository.php

@@ -115,13 +115,11 @@ class SingleCategoryRepository extends ComponentRepository implements SingleCate
     {
         $offset = $page > 0 ? $page * 50 : 0;
 
-        return $category->transactionjournals()->withRelevantData()->take(50)->offset($offset)
+        return $category->transactionjournals()->expanded()->take(50)->offset($offset)
                         ->orderBy('transaction_journals.date', 'DESC')
                         ->orderBy('transaction_journals.order', 'ASC')
                         ->orderBy('transaction_journals.id', 'DESC')
-                        ->get(
+                        ->get(TransactionJournal::QUERYFIELDS);
-                            ['transaction_journals.*']
-                        );
 
     }
 
@@ -140,13 +138,13 @@ class SingleCategoryRepository extends ComponentRepository implements SingleCate
         return $category->transactionjournals()
                         ->after($start)
                         ->before($end)
-                        ->withRelevantData()->take(50)->offset($offset)
+                        ->expanded()
+                        ->take(50)
+                        ->offset($offset)
                         ->orderBy('transaction_journals.date', 'DESC')
                         ->orderBy('transaction_journals.order', 'ASC')
                         ->orderBy('transaction_journals.id', 'DESC')
-                        ->get(
+                        ->get(TransactionJournal::QUERYFIELDS);
-                            ['transaction_journals.*']
-                        );
     }