bugfixes and blue-green deployment feature implementation (#1017)

* fixed bug with pagination in the quality assurance list.

* yield should return an empty string

* implemented blue-green deployment strategy for zero-downtime deployments.

apollo/locations/services.py

@@ -27,7 +27,7 @@ class LocationService(Service):
     def export_list(self, query):
         headers = []
         if query.count() == 0:
-            yield None
+            yield ""
             return
 
         location_set = query.first().location_set

apollo/participants/services.py

@@ -21,7 +21,7 @@ class ParticipantService(Service):
 
     def export_list(self, query):
         if query.count() == 0:
-            yield None
+            yield ""
             return
 
         participant = query.first()

apollo/submissions/services.py

@@ -47,7 +47,7 @@ class SubmissionService(Service):
 
     def export_list(self, query, include_qa=False, include_group_timestamps=False):
         if query.count() == 0:
-            yield None
+            yield ""
             return
 
         submission = query.first()

apollo/submissions/views_submissions.py

@@ -1305,7 +1305,7 @@ def quality_assurance_list(form_id):
     breadcrumbs = [_("Quality Assurance"), form.name]
     filter_class = filters.generate_quality_assurance_filter(event, form)
 
-    data = request.args.to_dict()
+    data = request.args.to_dict(flat=False)
     data["form_id"] = str(form.id)
     page = int(data.pop("page", [1])[0])
     loc_types = displayable_location_types(is_administrative=True, location_set_id=g.event.location_set_id)

docker-compose.yml

@@ -42,7 +42,7 @@ services:
       - ./.env
     command: ['flask', 'db', 'upgrade']
 
-  web:
+  web-blue: &web
     restart: always
     build:
       context: .
@@ -70,6 +70,11 @@ services:
       - "5000:5000"
     command: ['gunicorn', '-c', 'gunicorn.py', 'apollo.runner']
 
+  web-green:
+    <<: *web
+    ports:
+      - "5001:5000"
+
   worker:
     restart: always
     build: