Case insensitive structure filter

arkindex/documents/api/elements.py

@@ -149,7 +149,7 @@ class ElementsList(CorpusACLMixin, ListAPIView):
         if structure_param is not None:
             filters['metadatas__in'] = MetaData.objects.filter(
                 type=MetaType.Structure,
-                value__contains=structure_param
+                value__icontains=structure_param
             )
 
         if 'corpus' in self.request.query_params:
@@ -421,7 +421,7 @@ class ElementParents(ListAPIView):
         if structure_param is not None:
             filters['metadatas__in'] = MetaData.objects.filter(
                 type=MetaType.Structure,
-                value__contains=structure_param
+                value__icontains=structure_param
             )
 
         recursive_param = self.request.query_params.get('recursive')
@@ -573,7 +573,7 @@ class ElementChildren(ListAPIView):
         if structure_param is not None:
             filters['metadatas__in'] = MetaData.objects.filter(
                 type=MetaType.Structure,
-                value__contains=structure_param
+                value__icontains=structure_param
             )
 
         recursive_param = self.request.query_params.get('recursive')