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* It's problematic to delete an instance that is referenced by a foreign key; where the referening model is one that has a Polymorphic parent. * Specifically, when Django goes to nullify the relationship it relies on the related instances[0] class type to issue a query to decide what to nullify. So if the foreignkey references multiple different types (i.e. ProjectUpdate, Job) then only 1 of those class types will get nullified. The end result is an IntegrityError when delete() is called. * This changeset ensures that the parent Polymorphic class is queried so that all the foreignkey entries are nullified * Also remove old Django "hack" that doesn't work with Django 1.11
18 lines
619 B
Python
18 lines
619 B
Python
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from django.contrib.contenttypes.models import ContentType
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from django.db import models
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def build_polymorphic_ctypes_map(cls):
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# {'1': 'unified_job', '2': 'Job', '3': 'project_update', ...}
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mapping = {}
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for ct in ContentType.objects.filter(app_label='main'):
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ct_model_class = ct.model_class()
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if ct_model_class and issubclass(ct_model_class, cls):
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mapping[ct.id] = ct_model_class._camel_to_underscore(ct_model_class.__name__)
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return mapping
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def SET_NULL(collector, field, sub_objs, using):
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return models.SET_NULL(collector, field, sub_objs.non_polymorphic(), using)
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