Return flow data results for Merged Datasets

Return flow data results for Merged Datasets and update tests to ensure
the data is returned

onadata/apps/api/tests/viewsets/test_floip_viewset.py

@@ -9,7 +9,16 @@
 from onadata.apps.api.tests.viewsets.test_abstract_viewset import \
     TestAbstractViewSet
 from onadata.apps.api.viewsets.floip_viewset import FloipViewSet
+from onadata.apps.api.viewsets.merged_xform_viewset import MergedXFormViewSet
 from onadata.apps.logger.models import Instance, XForm
+from onadata.libs.utils.user_auth import get_user_default_project
+
+
+MD = """
+| survey  |
+|         | type  | name   | label   |
+|         | photo | image1 | Photo   |
+"""
 
 
 class TestFloipViewSet(TestAbstractViewSet):
@@ -196,6 +205,50 @@ def test_publish_number_question_names(self):  # pylint: disable=C0103
             self.assertIn(u"The name '1448506769745_42' is an invalid XML tag",
                           response.data['text'])
 
+    def test_retrieve_responses_merged_dataset(self):
+        """
+        Test retrieving responses from the FLOIP endpoint
+        """
+        merged_dataset_view = MergedXFormViewSet.as_view({
+            'post': 'create',
+        })
+
+        self.project = get_user_default_project(self.user)
+        self._publish_xls_form_to_project()
+        self._make_submissions()
+        xform = self._publish_markdown(MD, self.user, id_string='a')
+
+        data = {
+            'xforms': [
+                f'http://testserver/api/v1/forms/{self.xform.pk}',
+                f'http://testserver/api/v1/forms/{xform.pk}',
+            ],
+            'name':
+            'Merged Dataset',
+            'project':
+            f'http://testserver/api/v1/projects/{self.project.pk}',
+        }
+
+        request = self.factory.post('/', data=data, **self.extra)
+        response = merged_dataset_view(request)
+        self.assertEqual(response.status_code, 201)
+        dataset_uuid = response.data['uuid']
+
+        # Assert that it's possible to retrieve the responses
+        view = FloipViewSet.as_view({'get': 'responses'})
+        request = self.factory.get(
+            f'/flow-results/packages/{dataset_uuid}/responses',
+            content_type='application/vnd.api+json', **self.extra)
+        response = view(request, uuid=dataset_uuid)
+        self.assertEqual(response.status_code, 200)
+
+        # Convert the returned generator object into a list
+        response.data['attributes']['responses'] = list(
+            response.data['attributes']['responses'])
+        # The transportation form(self.xform) contains 11 responses
+        # Assert that the responses are returned
+        self.assertEqual(len(response.data['attributes']['responses']), 11)
+
     def test_responses_endpoint_format(self):
         """
         Test that the responses endpoint returns flow results in the correct

onadata/apps/api/viewsets/floip_viewset.py

@@ -12,7 +12,7 @@
 from rest_framework_json_api.renderers import JSONRenderer
 
 from onadata.apps.api.permissions import XFormPermissions
-from onadata.apps.logger.models import XForm
+from onadata.apps.logger.models import XForm, Instance
 from onadata.libs import filters
 from onadata.libs.renderers.renderers import floip_list
 from onadata.libs.serializers.floip_serializer import (
@@ -105,7 +105,17 @@ def responses(self, request, uuid=None):
             else:
                 status_code = status.HTTP_201_CREATED
         else:
-            queryset = xform.instances.values_list('json', flat=True)
+            if xform.is_merged_dataset:
+                xform_pks = xform.mergedxform.xforms.filter(
+                    deleted_at__isnull=True).values_list(
+                        'pk', flat=True)
+                queryset = Instance.objects.filter(
+                    xform_id__in=xform_pks,
+                    deleted_at__isnull=True).values_list(
+                        'json', flat=True)
+            else:
+                queryset = xform.instances.values_list('json', flat=True)
+
             paginate_queryset = self.paginate_queryset(queryset)
             if paginate_queryset:
                 data['attributes']['responses'] = floip_list(paginate_queryset)