Update API and transaction components.

app/Helpers/Collector/GroupCollector.php

@@ -118,6 +118,25 @@ class GroupCollector implements GroupCollectorInterface
         ];
     }
 
+    /**
+     * Return the transaction journals without group information. Is useful in some instances.
+     *
+     * @return array
+     */
+    public function getExtractedJournals(): array
+    {
+        $selection = $this->getGroups();
+        $return    = new Collection;
+        /** @var array $group */
+        foreach ($selection as $group) {
+            foreach ($group['transactions'] as $journalId => $journal) {
+                $return[$journalId] = $journal;
+            }
+        }
+
+        return $return;
+    }
+
     /**
      * Return the groups.
      *
@@ -339,6 +358,18 @@ class GroupCollector implements GroupCollectorInterface
         return $this;
     }
 
+    /**
+     * Limit the search to one specific transaction group.
+     *
+     * @param TransactionGroup $transactionGroup
+     *
+     * @return GroupCollectorInterface
+     */
+    public function setTransactionGroup(TransactionGroup $transactionGroup): GroupCollectorInterface
+    {
+        $this->query->where('transaction_groups.id', $transactionGroup->id);
+    }
+
     /**
      * Limit the included transaction types.
      *

app/Helpers/Collector/GroupCollectorInterface.php

@@ -29,6 +29,7 @@ use FireflyIII\Models\Budget;
 use FireflyIII\Models\Category;
 use FireflyIII\Models\Tag;
 use FireflyIII\Models\TransactionCurrency;
+use FireflyIII\Models\TransactionGroup;
 use FireflyIII\User;
 use Illuminate\Pagination\LengthAwarePaginator;
 use Illuminate\Support\Collection;
@@ -38,6 +39,13 @@ use Illuminate\Support\Collection;
  */
 interface GroupCollectorInterface
 {
+    /**
+     * Return the transaction journals without group information. Is useful in some instances.
+     *
+     * @return array
+     */
+    public function getExtractedJournals(): array;
+
     /**
      * Return the groups.
      *
@@ -106,6 +114,15 @@ interface GroupCollectorInterface
      */
     public function setCurrency(TransactionCurrency $currency): GroupCollectorInterface;
 
+    /**
+     * Limit the result to a set of specific journals.
+     *
+     * @param array $journalIds
+     *
+     * @return GroupCollectorInterface
+     */
+    public function setJournalIds(array $journalIds): GroupCollectorInterface;
+
     /**
      * Limit the number of returned entries.
      *
@@ -124,15 +141,6 @@ interface GroupCollectorInterface
      */
     public function setPage(int $page): GroupCollectorInterface;
 
-    /**
-     * Limit the result to a set of specific journals.
-     *
-     * @param array $journalIds
-     *
-     * @return GroupCollectorInterface
-     */
-    public function setJournalIds(array $journalIds): GroupCollectorInterface;
-
     /**
      * Set the start and end time of the results to return.
      *
@@ -152,6 +160,15 @@ interface GroupCollectorInterface
      */
     public function setTag(Tag $tag): GroupCollectorInterface;
 
+    /**
+     * Limit the search to one specific transaction group.
+     *
+     * @param TransactionGroup $transactionGroup
+     *
+     * @return GroupCollectorInterface
+     */
+    public function setTransactionGroup(TransactionGroup $transactionGroup): GroupCollectorInterface;
+
     /**
      * Limit the included transaction types.
      *