mirror of
https://github.com/pacnpal/thrillwiki_django_no_react.git
synced 2025-12-20 16:31:08 -05:00
93 lines
3.3 KiB
Python
93 lines
3.3 KiB
Python
from django.db import models
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from django.contrib.contenttypes.models import ContentType
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from django.contrib.contenttypes.fields import GenericForeignKey
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from django.conf import settings
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from typing import Any, Dict, Optional
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from django.db.models import QuerySet
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class DiffMixin:
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"""Mixin to add diffing capabilities to models"""
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def get_prev_record(self) -> Optional[Any]:
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"""Get the previous record for this instance"""
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try:
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return type(self).objects.filter(
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pgh_created_at__lt=self.pgh_created_at,
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pgh_obj_id=self.pgh_obj_id
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).order_by('-pgh_created_at').first()
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except (AttributeError, TypeError):
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return None
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def diff_against_previous(self) -> Dict:
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"""Compare this record against the previous one"""
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prev_record = self.get_prev_record()
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if not prev_record:
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return {}
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skip_fields = {
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'pgh_id', 'pgh_created_at', 'pgh_label',
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'pgh_obj_id', 'pgh_context_id', '_state',
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'created_at', 'updated_at'
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}
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changes = {}
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for field, value in self.__dict__.items():
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# Skip internal fields and those we don't want to track
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if field.startswith('_') or field in skip_fields or field.endswith('_id'):
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continue
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try:
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old_value = getattr(prev_record, field)
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new_value = value
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if old_value != new_value:
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changes[field] = {
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"old": str(old_value) if old_value is not None else "None",
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"new": str(new_value) if new_value is not None else "None"
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}
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except AttributeError:
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continue
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return changes
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class TrackedModel(models.Model):
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"""Abstract base class for models that need history tracking"""
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created_at = models.DateTimeField(auto_now_add=True)
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updated_at = models.DateTimeField(auto_now=True)
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class Meta:
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abstract = True
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def get_history(self) -> QuerySet:
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"""Get all history records for this instance in chronological order"""
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event_model = self.events.model # pghistory provides this automatically
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if event_model:
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return event_model.objects.filter(
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pgh_obj_id=self.pk
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).order_by('-pgh_created_at')
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return self.__class__.objects.none()
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class HistoricalSlug(models.Model):
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"""Track historical slugs for models"""
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content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
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object_id = models.PositiveIntegerField()
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content_object = GenericForeignKey('content_type', 'object_id')
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slug = models.SlugField(max_length=255)
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created_at = models.DateTimeField(auto_now_add=True)
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user = models.ForeignKey(
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settings.AUTH_USER_MODEL,
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null=True,
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blank=True,
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on_delete=models.SET_NULL,
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related_name='historical_slugs'
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)
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class Meta:
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unique_together = ('content_type', 'slug')
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indexes = [
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models.Index(fields=['content_type', 'object_id']),
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models.Index(fields=['slug']),
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]
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def __str__(self) -> str:
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return f"{self.content_type} - {self.object_id} - {self.slug}"
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