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pacnpal
302
apps/parks/managers.py
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302
apps/parks/managers.py
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"""
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Custom managers and QuerySets for Parks models.
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Optimized queries following Django styleguide patterns.
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"""
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from django.db.models import Q, Count, Avg, Max, Min, Prefetch
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from apps.core.managers import (
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BaseQuerySet,
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BaseManager,
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LocationQuerySet,
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LocationManager,
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ReviewableQuerySet,
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ReviewableManager,
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StatusQuerySet,
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StatusManager,
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)
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class ParkQuerySet(StatusQuerySet, ReviewableQuerySet, LocationQuerySet):
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"""Optimized QuerySet for Park model."""
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def with_complete_stats(self):
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"""Add comprehensive park statistics."""
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return self.annotate(
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ride_count_calculated=Count("rides", distinct=True),
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coaster_count_calculated=Count(
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"rides",
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filter=Q(rides__category__in=["RC", "WC"]),
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distinct=True,
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),
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area_count=Count("areas", distinct=True),
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review_count=Count(
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"reviews", filter=Q(reviews__is_published=True), distinct=True
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),
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average_rating_calculated=Avg(
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"reviews__rating", filter=Q(reviews__is_published=True)
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),
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latest_ride_opening=Max("rides__opening_date"),
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oldest_ride_opening=Min("rides__opening_date"),
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)
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def optimized_for_list(self):
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"""Optimize for park list display."""
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return (
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self.select_related("operator", "property_owner")
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.prefetch_related("location")
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.with_complete_stats()
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)
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def optimized_for_detail(self):
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"""Optimize for park detail display."""
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from apps.rides.models import Ride
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from .models import ParkReview
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return self.select_related("operator", "property_owner").prefetch_related(
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"location",
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"areas",
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Prefetch(
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"rides",
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queryset=Ride.objects.select_related(
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"manufacturer", "designer", "ride_model", "park_area"
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).order_by("name"),
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),
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Prefetch(
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"reviews",
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queryset=ParkReview.objects.select_related("user")
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.filter(is_published=True)
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.order_by("-created_at")[:10],
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),
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"photos",
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)
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def by_operator(self, *, operator_id: int):
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"""Filter parks by operator."""
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return self.filter(operator_id=operator_id)
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def by_property_owner(self, *, owner_id: int):
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"""Filter parks by property owner."""
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return self.filter(property_owner_id=owner_id)
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def with_minimum_coasters(self, *, min_coasters: int = 5):
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"""Filter parks with minimum number of coasters."""
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return self.with_complete_stats().filter(
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coaster_count_calculated__gte=min_coasters
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)
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def large_parks(self, *, min_acres: float = 100.0):
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"""Filter for large parks."""
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return self.filter(size_acres__gte=min_acres)
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def seasonal_parks(self):
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"""Filter for parks with seasonal operation."""
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return self.exclude(operating_season__exact="")
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def for_map_display(self, *, bounds=None):
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"""Optimize for map display with minimal data."""
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queryset = self.select_related("operator").prefetch_related("location")
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if bounds:
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queryset = queryset.within_bounds(
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north=bounds.north,
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south=bounds.south,
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east=bounds.east,
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west=bounds.west,
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)
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return queryset.values(
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"id",
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"name",
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"slug",
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"status",
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"location__latitude",
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"location__longitude",
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"location__city",
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"location__state",
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"location__country",
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"operator__name",
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)
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def search_autocomplete(self, *, query: str, limit: int = 10):
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"""Optimized search for autocomplete."""
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return (
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self.filter(
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Q(name__icontains=query)
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| Q(location__city__icontains=query)
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| Q(location__state__icontains=query)
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)
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.select_related("operator", "location")
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.values(
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"id",
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"name",
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"slug",
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"location__city",
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"location__state",
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"operator__name",
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)[:limit]
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)
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class ParkManager(StatusManager, ReviewableManager, LocationManager):
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"""Custom manager for Park model."""
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def get_queryset(self):
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return ParkQuerySet(self.model, using=self._db)
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def with_complete_stats(self):
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return self.get_queryset().with_complete_stats()
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def optimized_for_list(self):
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return self.get_queryset().optimized_for_list()
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def optimized_for_detail(self):
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return self.get_queryset().optimized_for_detail()
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def by_operator(self, *, operator_id: int):
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return self.get_queryset().by_operator(operator_id=operator_id)
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def large_parks(self, *, min_acres: float = 100.0):
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return self.get_queryset().large_parks(min_acres=min_acres)
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def for_map_display(self, *, bounds=None):
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return self.get_queryset().for_map_display(bounds=bounds)
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class ParkAreaQuerySet(BaseQuerySet):
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"""QuerySet for ParkArea model."""
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def with_ride_counts(self):
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"""Add ride count annotations."""
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return self.annotate(
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ride_count=Count("rides", distinct=True),
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coaster_count=Count(
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"rides",
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filter=Q(rides__category__in=["RC", "WC"]),
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distinct=True,
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),
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)
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def optimized_for_list(self):
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"""Optimize for area list display."""
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return self.select_related("park").with_ride_counts()
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def by_park(self, *, park_id: int):
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"""Filter areas by park."""
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return self.filter(park_id=park_id)
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def with_rides(self):
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"""Filter areas that have rides."""
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return self.filter(rides__isnull=False).distinct()
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class ParkAreaManager(BaseManager):
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"""Manager for ParkArea model."""
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def get_queryset(self):
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return ParkAreaQuerySet(self.model, using=self._db)
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def with_ride_counts(self):
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return self.get_queryset().with_ride_counts()
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def by_park(self, *, park_id: int):
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return self.get_queryset().by_park(park_id=park_id)
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class ParkReviewQuerySet(ReviewableQuerySet):
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"""QuerySet for ParkReview model."""
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def for_park(self, *, park_id: int):
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"""Filter reviews for a specific park."""
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return self.filter(park_id=park_id)
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def by_user(self, *, user_id: int):
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"""Filter reviews by user."""
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return self.filter(user_id=user_id)
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def by_rating_range(self, *, min_rating: int = 1, max_rating: int = 10):
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"""Filter reviews by rating range."""
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return self.filter(rating__gte=min_rating, rating__lte=max_rating)
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def optimized_for_display(self):
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"""Optimize for review display."""
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return self.select_related("user", "park", "moderated_by")
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def recent_reviews(self, *, days: int = 30):
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"""Get recent reviews."""
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return self.recent(days=days)
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def moderation_required(self):
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"""Filter reviews requiring moderation."""
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return self.filter(Q(is_published=False) | Q(moderated_at__isnull=True))
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class ParkReviewManager(BaseManager):
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"""Manager for ParkReview model."""
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def get_queryset(self):
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return ParkReviewQuerySet(self.model, using=self._db)
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def for_park(self, *, park_id: int):
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return self.get_queryset().for_park(park_id=park_id)
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def by_rating_range(self, *, min_rating: int = 1, max_rating: int = 10):
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return self.get_queryset().by_rating_range(
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min_rating=min_rating, max_rating=max_rating
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)
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def moderation_required(self):
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return self.get_queryset().moderation_required()
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class CompanyQuerySet(BaseQuerySet):
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"""QuerySet for Company model."""
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def operators(self):
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"""Filter for companies that operate parks."""
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return self.filter(roles__contains=["OPERATOR"])
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def property_owners(self):
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"""Filter for companies that own park properties."""
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return self.filter(roles__contains=["PROPERTY_OWNER"])
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def manufacturers(self):
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"""Filter for ride manufacturers."""
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return self.filter(roles__contains=["MANUFACTURER"])
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def with_park_counts(self):
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"""Add park count annotations."""
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return self.annotate(
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operated_parks_count=Count("operated_parks", distinct=True),
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owned_parks_count=Count("owned_parks", distinct=True),
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total_parks_involvement=Count("operated_parks", distinct=True)
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+ Count("owned_parks", distinct=True),
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)
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def major_operators(self, *, min_parks: int = 5):
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"""Filter for major park operators."""
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return (
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self.operators()
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.with_park_counts()
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.filter(operated_parks_count__gte=min_parks)
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)
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def optimized_for_list(self):
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"""Optimize for company list display."""
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return self.with_park_counts()
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class CompanyManager(BaseManager):
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"""Manager for Company model."""
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def get_queryset(self):
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return CompanyQuerySet(self.model, using=self._db)
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def operators(self):
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return self.get_queryset().operators()
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def manufacturers(self):
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return self.get_queryset().manufacturers()
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def major_operators(self, *, min_parks: int = 5):
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return self.get_queryset().major_operators(min_parks=min_parks)
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