flows: fix exporting and importing for models with multiple unique fields

passbook/flows/management/commands/apply_flow.py

@@ -0,0 +1,22 @@
+"""Apply flow from commandline"""
+from django.core.management.base import BaseCommand, no_translations
+
+from passbook.flows.transfer.importer import FlowImporter
+
+
+class Command(BaseCommand):
+    """Apply flow from commandline"""
+
+    @no_translations
+    def handle(self, *args, **options):
+        """Apply all flows in order, abort when one fails to import"""
+        for flow_path in options.get("flows", []):
+            with open(flow_path, "r") as flow_file:
+                importer = FlowImporter(flow_file.read())
+                valid = importer.validate()
+                if not valid:
+                    raise ValueError("Flow invalid")
+                importer.apply()
+
+    def add_arguments(self, parser):
+        parser.add_argument("flows", nargs="+", type=str)