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https://github.com/pacnpal/thrillwiki_django_no_react.git
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105 lines
3.6 KiB
Python
105 lines
3.6 KiB
Python
from django.db import models
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from django.contrib.contenttypes.fields import GenericForeignKey
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from django.contrib.contenttypes.models import ContentType
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from django.utils.text import slugify
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from history_tracking.models import TrackedModel
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class SlugHistory(models.Model):
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"""
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Model for tracking slug changes across all models that use slugs.
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Uses generic relations to work with any model.
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"""
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content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
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object_id = models.CharField(max_length=50) # Using CharField to work with our custom IDs
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content_object = GenericForeignKey('content_type', 'object_id')
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old_slug = models.SlugField(max_length=200)
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created_at = models.DateTimeField(auto_now_add=True)
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class Meta:
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indexes = [
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models.Index(fields=['content_type', 'object_id']),
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models.Index(fields=['old_slug']),
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]
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verbose_name_plural = 'Slug histories'
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ordering = ['-created_at']
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def __str__(self):
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return f"Old slug '{self.old_slug}' for {self.content_object}"
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class SluggedModel(TrackedModel):
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"""
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Abstract base model that provides slug functionality with history tracking.
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"""
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name = models.CharField(max_length=200)
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slug = models.SlugField(max_length=200, unique=True)
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class Meta:
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abstract = True
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def save(self, *args, **kwargs):
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# Get the current instance from DB if it exists
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if self.pk:
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try:
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old_instance = self.__class__.objects.get(pk=self.pk)
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# If slug has changed, save the old one to history
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if old_instance.slug != self.slug:
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SlugHistory.objects.create(
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content_type=ContentType.objects.get_for_model(self),
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object_id=getattr(self, self.get_id_field_name()),
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old_slug=old_instance.slug
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)
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except self.__class__.DoesNotExist:
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pass
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# Generate slug if not set
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if not self.slug:
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self.slug = slugify(self.name)
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super().save(*args, **kwargs)
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def get_id_field_name(self):
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"""
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Returns the name of the read-only ID field for this model.
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Should be overridden by subclasses.
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"""
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raise NotImplementedError(
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"Subclasses of SluggedModel must implement get_id_field_name()"
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)
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@classmethod
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def get_by_slug(cls, slug):
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"""
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Get an object by its current or historical slug.
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Returns (object, is_old_slug) tuple.
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"""
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try:
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# Try to get by current slug first
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return cls.objects.get(slug=slug), False
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except cls.DoesNotExist:
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# Check pghistory first
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history_model = cls.get_history_model()
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history_entry = (
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history_model.objects.filter(slug=slug)
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.order_by('-pgh_created_at')
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.first()
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)
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if history_entry:
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return cls.objects.get(id=history_entry.pgh_obj_id), True
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# Try to find in manual slug history as fallback
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history = SlugHistory.objects.filter(
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content_type=ContentType.objects.get_for_model(cls),
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old_slug=slug
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).order_by('-created_at').first()
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if history:
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return cls.objects.get(
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**{cls.get_id_field_name(): history.object_id}
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), True
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raise cls.DoesNotExist(
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f"{cls.__name__} with slug '{slug}' does not exist"
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)
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