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netbox-community-netbox/netbox/dcim/migrations/0178_virtual_chassis_member_counter.py

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from django.db import migrations
from django.db.models import Count
import utilities.fields
from utilities.counters import update_counts
def populate_virtualchassis_members(apps, schema_editor):
VirtualChassis = apps.get_model('dcim', 'VirtualChassis')
update_counts(VirtualChassis, 'member_count', 'members')
class Migration(migrations.Migration):
dependencies = [
('dcim', '0177_devicetype_component_counters'),
]
operations = [
migrations.AddField(
model_name='virtualchassis',
name='member_count',
field=utilities.fields.CounterCacheField(
default=0, to_field='virtual_chassis', to_model='dcim.Device'
),
),
migrations.RunPython(
code=populate_virtualchassis_members,
reverse_code=migrations.RunPython.noop
),
]