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179c06ec20
* Initial work on ObjectChange data migrations * Fix migration bug * Add migrators for MAC address assignments * Update reverting kwarg; allow pop() to fail * Cross-reference MAC address migrators * Split migrator logic across migrations * Add missing migrator
101 lines
3.2 KiB
Python
101 lines
3.2 KiB
Python
import django.db.models.deletion
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from django.db import migrations, models
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def populate_denormalized_fields(apps, schema_editor):
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"""
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Copy site ForeignKey values to the Termination GFK.
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"""
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CircuitTermination = apps.get_model('circuits', 'CircuitTermination')
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db_alias = schema_editor.connection.alias
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terminations = CircuitTermination.objects.using(db_alias).filter(site__isnull=False).prefetch_related('site')
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for termination in terminations:
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termination._region_id = termination.site.region_id
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termination._site_group_id = termination.site.group_id
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termination._site_id = termination.site_id
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# Note: Location cannot be set prior to migration
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CircuitTermination.objects.using(db_alias).bulk_update(
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terminations,
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['_region', '_site_group', '_site'],
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batch_size=100
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)
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class Migration(migrations.Migration):
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dependencies = [
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('circuits', '0047_circuittermination__termination'),
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]
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operations = [
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migrations.AddField(
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model_name='circuittermination',
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name='_location',
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field=models.ForeignKey(
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blank=True,
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null=True,
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on_delete=django.db.models.deletion.CASCADE,
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related_name='circuit_terminations',
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to='dcim.location',
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),
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),
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migrations.AddField(
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model_name='circuittermination',
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name='_region',
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field=models.ForeignKey(
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blank=True,
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null=True,
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on_delete=django.db.models.deletion.CASCADE,
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related_name='circuit_terminations',
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to='dcim.region',
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),
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),
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migrations.AddField(
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model_name='circuittermination',
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name='_site',
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field=models.ForeignKey(
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blank=True,
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null=True,
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on_delete=django.db.models.deletion.CASCADE,
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related_name='circuit_terminations',
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to='dcim.site',
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),
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),
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migrations.AddField(
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model_name='circuittermination',
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name='_site_group',
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field=models.ForeignKey(
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blank=True,
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null=True,
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on_delete=django.db.models.deletion.CASCADE,
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related_name='circuit_terminations',
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to='dcim.sitegroup',
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),
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),
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# Populate denormalized FK values
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migrations.RunPython(code=populate_denormalized_fields, reverse_code=migrations.RunPython.noop),
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# Delete the site ForeignKey
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migrations.RemoveField(
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model_name='circuittermination',
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name='site',
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),
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migrations.RenameField(
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model_name='circuittermination',
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old_name='provider_network',
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new_name='_provider_network',
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),
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]
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def oc_circuittermination_remove_fields(objectchange, reverting):
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for data in (objectchange.prechange_data, objectchange.postchange_data):
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if data is not None:
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data.pop('site', None)
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data.pop('provider_network', None)
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objectchange_migrators = {
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'circuits.circuittermination': oc_circuittermination_remove_fields,
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}
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