diff --git a/src/Service/Nelmio/DtoOADescriber.php b/src/Service/Nelmio/DtoOADescriber.php
index 77aa973..cfac802 100644
--- a/src/Service/Nelmio/DtoOADescriber.php
+++ b/src/Service/Nelmio/DtoOADescriber.php
@@ -230,9 +230,17 @@ private function resolveProperties(
             ]);
 
             if (is_array($model)) {
-                $property->properties = $this->resolveProperties($model);
-                $property->type = 'object';
-                $property->required = $this->resolveRequiredProperties($model);
+                // checking whether there is an empty index by which you can distinguish whether the model is a collection of objects or a flat object
+                if (is_array($model[''] ?? null)) {
+                    $property->type = "array";
+                    $property->items = new Items([]);
+                    $property->items->properties = $this->resolveProperties($model['']);
+                    $property->items->required = $this->resolveRequiredProperties($model['']);
+                } else {
+                    $property->type = 'object';
+                    $property->properties = $this->resolveProperties($model);
+                    $property->required = $this->resolveRequiredProperties($model);
+                }
             } else {
                 $assignTo = $property;
 
@@ -338,6 +346,9 @@ private function getClassBags(
             }
 
             if ($item instanceof DtoTypeModel) {
+                if ($item->isCollection()) { // forces an empty index to make it easier to check whether an element is an array
+                    $propertyPath .= '.';
+                }
                 $bags = DtoUtil::mergeRecursively($bags, $this->getClassBags($item, $propertyPath));
 
                 continue;
diff --git a/src/Service/Validation/TypeValidationHelper.php b/src/Service/Validation/TypeValidationHelper.php
index a28714f..6d8af3b 100644
--- a/src/Service/Validation/TypeValidationHelper.php
+++ b/src/Service/Validation/TypeValidationHelper.php
@@ -42,6 +42,7 @@ public function validateType(
         }
 
         $list = new ConstraintViolationList();
+
         // coerce and copy sub-values
         foreach ($subValues as $key => $value) {
             if (null === ($result = $this->coercionService->coerce($key, $subProperties[$key], $value))) {