[change] Moved DeviceNode migration to create_device_nodes command #92

Closes #92

README.rst

@@ -294,6 +294,16 @@ by default the data is added to the first found organization, eg::
 
 **Note**: you can follow the `tutorial to migrate database from django-netjsongraph <https://github.com/openwisp/django-netjsongraph/blob/master/README.rst>`_.
 
+create_device_nodes
+^^^^^^^^^^^^^^^^^^^
+
+The ``create_device_nodes`` management command is used to create ``DeviceNode`` objects when
+this module is integrated with ``openwisp_controller``. It can be used as follows:
+
+.. code-block:: shell
+
+    ./manage.py create_device_nodes
+
 Logging
 -------
 

openwisp_network_topology/integrations/device/management/commands/__init__.py

@@ -0,0 +1,15 @@
+import swapper
+from django.core.management.base import BaseCommand
+
+
+class BaseCreateDeviceNodeCommand(BaseCommand):
+    help = 'Create initial DeviceNode objects'
+
+    def handle(self, *args, **kwargs):
+        Node = swapper.load_model('topology', 'Node')
+        DeviceNode = swapper.load_model('topology_device', 'DeviceNode')
+        queryset = Node.objects.select_related('topology').filter(
+            topology__parser='netdiff.OpenvpnParser'
+        )
+        for node in queryset.iterator():
+            DeviceNode.auto_create(node)

openwisp_network_topology/integrations/device/management/commands/create_device_nodes.py

@@ -0,0 +1,5 @@
+from . import BaseCreateDeviceNodeCommand
+
+
+class Command(BaseCreateDeviceNodeCommand):
+    pass

tests/openwisp2/sample_integration_device/management/commands/create_device_nodes.py

@@ -0,0 +1,7 @@
+from openwisp_network_topology.integrations.device.management.commands import (
+    BaseCreateDeviceNodeCommand,
+)
+
+
+class Command(BaseCreateDeviceNodeCommand):
+    pass