Add publisher for rack (#2520)

Add publisher for rack

src/ralph/ralph2_sync/publishers.py

@@ -12,7 +12,7 @@
     ConfigurationClass,
     ConfigurationModule
 )
-from ralph.data_center.models import DataCenterAsset
+from ralph.data_center.models import DataCenterAsset, Rack
 from ralph.data_importer.models import (
     ImportedObjectDoesNotExist,
     ImportedObjects
@@ -138,6 +138,26 @@ def sync_model_to_ralph2(sender, instance=None, created=False, **kwargs):
     }
 
 
+@ralph2_sync(Rack)
+def sync_rack_to_ralph2(sender, instance=None, created=False, **kwargs):
+    """
+    Publish Rack info to sync it in Ralph3.
+    """
+    rack = instance
+    return {
+        'id': rack.id,
+        'ralph2_id': _get_obj_id_ralph_2(rack),
+        'name': rack.name,
+        'description': rack.description,
+        'orientation': rack.orientation,
+        'max_u_height': rack.max_u_height,
+        'visualization_col': rack.visualization_col,
+        'visualization_row': rack.visualization_row,
+        'server_room': _get_obj_id_ralph_2(rack.server_room),
+        'data_center': _get_obj_id_ralph_2(rack.server_room.data_center) if rack.server_room else None,  # noqa
+    }
+
+
 @ralph2_sync(ConfigurationModule)
 def sync_configuration_module_to_ralph2(sender, instance=None, created=False, **kwargs):  # noqa
     """