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# Generated by Django 2.2.16 on 2020-09-04 12:06
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from django.db import migrations
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from logging import getLogger
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log = getLogger(__name__)
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# Oprava migrací 0065 a 0066, kde jsem špatně pochopil django-polymorphic
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# Pomocná funkce -- děláme to samé pro obě polymorfní hierarchie
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def fix_ctypes(parent: str, children, apps, schema_editor):
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Parent = apps.get_model('seminar', parent)
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ContentType = apps.get_model('contenttypes', 'ContentType')
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# Nejdřív všechno smažeme:
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Parent.objects.update(polymorphic_ctype=None)
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# Opravíme děti
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for clsname in children:
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Model = apps.get_model('seminar', clsname)
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ct = ContentType.objects.get_for_model(Model)
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Model.objects.update(polymorphic_ctype=ct)
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# Ostatní instance mají mít explicitně content type pro rodiče
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new_ct = ContentType.objects.get_for_model(Parent)
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for obj in Parent.objects.filter(polymorphic_ctype__isnull=True):
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# Po úpravě pořadí migrací se tohle stane pro každý problém. Není to správně, ale warning moc otravuje…
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log.info(f"{parent} \"{obj}\" neměl content type -- nejspíš to je instance přímo {parent}!")
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obj.polymorphic_ctype=new_ct
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obj.save()
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def fix_treenode(apps, schema_editor):
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children = ['RocnikNode', 'CisloNode', 'MezicisloNode', 'TemaVCisleNode',
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'OrgTextNode', 'UlohaZadaniNode', 'UlohaVzorakNode', 'PohadkaNode',
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'TextNode', 'CastNode', 'ReseniNode']
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fix_ctypes("TreeNode", children, apps, schema_editor)
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def fix_problem(apps, schema_editor):
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children = ['Tema', 'Clanek', 'Uloha'] # FIXME: Konfera z nějakého důvodu tenhle field vůbec nemá, asi je to špatně.
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fix_ctypes("Problem", children, apps, schema_editor)
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class Migration(migrations.Migration):
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dependencies = [
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('seminar', '0077_auto_20200318_2146'),
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]
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operations = [
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migrations.RunPython(fix_treenode, migrations.RunPython.noop),
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migrations.RunPython(fix_problem, migrations.RunPython.noop),
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]
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