Introduce group collector to API

app/Api/V1/Controllers/BudgetLimitController.php

@@ -26,12 +26,12 @@ namespace FireflyIII\Api\V1\Controllers;
 
 use FireflyIII\Api\V1\Requests\BudgetLimitRequest;
 use FireflyIII\Exceptions\FireflyException;
-use FireflyIII\Helpers\Collector\TransactionCollectorInterface;
+use FireflyIII\Helpers\Collector\GroupCollectorInterface;
 use FireflyIII\Models\BudgetLimit;
 use FireflyIII\Repositories\Budget\BudgetRepositoryInterface;
 use FireflyIII\Support\Http\Api\TransactionFilter;
 use FireflyIII\Transformers\BudgetLimitTransformer;
-use FireflyIII\Transformers\TransactionTransformer;
+use FireflyIII\Transformers\TransactionGroupTransformer;
 use FireflyIII\User;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
@@ -202,21 +202,31 @@ class BudgetLimitController extends Controller
 
         /** @var User $admin */
         $admin = auth()->user();
-        /** @var TransactionCollectorInterface $collector */
-        $collector = app(TransactionCollectorInterface::class);
-        $collector->setUser($admin);
-        $collector->withOpposingAccount()->withCategoryInformation()->withBudgetInformation();
-        $collector->setAllAssetAccounts();
-        $collector->setBudget($budgetLimit->budget);
+
+        // use new group collector:
+        /** @var GroupCollectorInterface $collector */
+        $collector = app(GroupCollectorInterface::class);
+        $collector
+            ->setUser($admin)
+            // filter on budget.
+            ->setBudget($budgetLimit->budget)
+            // all info needed for the API:
+            ->withAPIInformation()
+            // set page size:
+            ->setLimit($pageSize)
+            // set page to retrieve
+            ->setPage($this->parameters->get('page'))
+            // set types of transactions to return.
+            ->setTypes($types);
+
         $collector->setRange($budgetLimit->start_date, $budgetLimit->end_date);
-        $collector->setLimit($pageSize)->setPage($this->parameters->get('page'));
         $collector->setTypes($types);
-        $paginator = $collector->getPaginatedTransactions();
+        $paginator = $collector->getPaginatedGroups();
         $paginator->setPath(route('api.v1.budget_limits.transactions', [$budgetLimit->id]) . $this->buildParams());
         $transactions = $paginator->getCollection();
 
-        /** @var TransactionTransformer $transformer */
-        $transformer = app(TransactionTransformer::class);
+        /** @var TransactionGroupTransformer $transformer */
+        $transformer = app(TransactionGroupTransformer::class);
         $transformer->setParameters($this->parameters);
 
         $resource = new FractalCollection($transactions, $transformer, 'transactions');