Expand API and routes.

app/Helpers/Collector/TransactionCollector.php

@@ -42,6 +42,7 @@ use FireflyIII\Models\Budget;
 use FireflyIII\Models\Category;
 use FireflyIII\Models\Tag;
 use FireflyIII\Models\Transaction;
+use FireflyIII\Models\TransactionCurrency;
 use FireflyIII\Repositories\Account\AccountRepositoryInterface;
 use FireflyIII\Support\CacheProperties;
 use FireflyIII\User;
@@ -527,6 +528,25 @@ class TransactionCollector implements TransactionCollectorInterface
         return $this;
     }
 
+    /**
+     * Set the required currency (local or foreign)
+     *
+     * @param TransactionCurrency $currency
+     *
+     * @return TransactionCollectorInterface
+     */
+    public function setCurrency(TransactionCurrency $currency): TransactionCollectorInterface
+    {
+        $this->query->where(
+            function (EloquentBuilder $builder) use ($currency) {
+                $builder->where('transactions.transaction_currency_id', $currency->id);
+                $builder->orWhere('transactions.foreign_currency_id', $currency->id);
+            }
+        );
+
+        return $this;
+    }
+
     /**
      * @param array $journalIds
      *

app/Helpers/Collector/TransactionCollectorInterface.php

@@ -27,6 +27,7 @@ use Carbon\Carbon;
 use FireflyIII\Models\Budget;
 use FireflyIII\Models\Category;
 use FireflyIII\Models\Tag;
+use FireflyIII\Models\TransactionCurrency;
 use FireflyIII\User;
 use Illuminate\Database\Eloquent\Builder as EloquentBuilder;
 use Illuminate\Pagination\LengthAwarePaginator;
@@ -144,6 +145,15 @@ interface TransactionCollectorInterface
      */
     public function setAllAssetAccounts(): TransactionCollectorInterface;
 
+    /**
+     * Set the required currency (local or foreign)
+     *
+     * @param TransactionCurrency $currency
+     *
+     * @return TransactionCollectorInterface
+     */
+    public function setCurrency(TransactionCurrency $currency): TransactionCollectorInterface;
+
     /**
      * Collect transactions before a specific date.
      *