Implement query optimization

ram/bookshelf/admin.py

@@ -98,6 +98,13 @@ class BookAdmin(SortableAdminBase, admin.ModelAdmin):
     search_fields = ("title", "publisher__name", "authors__last_name")
     list_filter = ("publisher__name", "authors", "published")
 
+    def get_queryset(self, request):
+        """Optimize queryset with select_related and prefetch_related."""
+        qs = super().get_queryset(request)
+        return qs.select_related('publisher', 'shop').prefetch_related(
+            'authors', 'tags', 'image', 'toc'
+        )
+
     fieldsets = (
         (
             None,
@@ -266,6 +273,13 @@ class CatalogAdmin(SortableAdminBase, admin.ModelAdmin):
         "scales__scale",
     )
 
+    def get_queryset(self, request):
+        """Optimize queryset with select_related and prefetch_related."""
+        qs = super().get_queryset(request)
+        return qs.select_related('manufacturer', 'shop').prefetch_related(
+            'scales', 'tags', 'image'
+        )
+
     fieldsets = (
         (
             None,
@@ -490,6 +504,11 @@ class MagazineAdmin(SortableAdminBase, admin.ModelAdmin):
         "publisher__name",
     )
 
+    def get_queryset(self, request):
+        """Optimize queryset with select_related and prefetch_related."""
+        qs = super().get_queryset(request)
+        return qs.select_related('publisher').prefetch_related('tags')
+
     fieldsets = (
         (
             None,

ram/bookshelf/models.py

@@ -11,6 +11,7 @@ from django_countries.fields import CountryField
 
 from ram.utils import DeduplicatedStorage
 from ram.models import BaseModel, Image, PropertyInstance
+from ram.managers import BookManager, CatalogManager, MagazineIssueManager
 from metadata.models import Scale, Manufacturer, Shop, Tag
 
 
@@ -105,6 +106,8 @@ class Book(BaseBook):
     authors = models.ManyToManyField(Author, blank=True)
     publisher = models.ForeignKey(Publisher, on_delete=models.CASCADE)
 
+    objects = BookManager()
+
     class Meta:
         ordering = ["title"]
 
@@ -134,6 +137,8 @@ class Catalog(BaseBook):
     years = models.CharField(max_length=12)
     scales = models.ManyToManyField(Scale, related_name="catalogs")
 
+    objects = CatalogManager()
+
     class Meta:
         ordering = ["manufacturer", "publication_year"]
 
@@ -214,6 +219,8 @@ class MagazineIssue(BaseBook):
         null=True, blank=True, choices=MONTHS.items()
     )
 
+    objects = MagazineIssueManager()
+
     class Meta:
         unique_together = ("magazine", "issue_number")
         ordering = [