Merge pull request 3scale-qe#141 from mkudlej/fix_usages_in_backend

fix list of usages in backend object

Author: dhlavac

tests/integration/test_integration_backends.py

@@ -48,3 +48,6 @@ def test_backend_metrics_list(backend, backend_metric):
 
 def test_backend_mapping_rules_list(backend, backend_mapping_rule):
     assert backend.mapping_rules.list()
+
+def test_backend_usages(backend, service, backend_usage):
+    assert backend.usages() == [backend_usage]

threescale_api/resources.py

@@ -1465,9 +1465,10 @@ def metrics(self) -> 'BackendMetrics':
     def mapping_rules(self) -> 'BackendMappingRules':
         return BackendMappingRules(parent=self, instance_klass=BackendMappingRule)
 
-    @property
-    def usages(self) -> 'BackendUsages':
-        return BackendUsages(parent=self, instance_klass=BackendUsages)
+    def usages(self) -> list['BackendUsage']:
+        """ Returns list of backend usages where the backend is used."""
+        return [usage for service in self.threescale_client.services.list()
+                for usage in service.backend_usages.select_by(backend_id=self['id'])]
 
 
 class BackendMetric(Metric):