Remove database queries from nav template

cbv/templates/cbv/includes/nav.html

@@ -1,3 +1,5 @@
+{% load sansdb %}
+{% sansdb %}
 <li li="version-{{ version.version_number }}" class="dropdown">
     {% if not other_versions %}
         <a href="#">{{ version }}</a>
@@ -8,35 +10,36 @@
         <ul class="dropdown-menu">
             {% for v in other_versions %}
                 <li>
-                    <a href="{{ v.url|default:v.get_absolute_url }}">{{ v }}</a>
+                    <a href="{{ v.url }}">{{ v.name }}</a>
                 </li>
             {% endfor %}
         </ul>
     {% endif %}
 </li>
-{% for module in version.module_set.all %}
+{% for module in modules %}
     {% ifchanged module.source_name %}
         <li class="divider-vertical"></li>
         <li><a href="#">{{ module.source_name }}</a></li>
     {% endifchanged %}
-    {% if module.klass_set.count == 1 %}
-        {% with klass=module.klass_set.get %}
-            <li {% if klass == this_klass %}class=" active"{% endif %}>
-                <a href="{{ klass.get_absolute_url }}">{{ klass }}</a>
+    {% if module.classes|length == 1 %}
+        {% with klass=module.classes.0 %}
+            <li {% if klass.active %}class=" active"{% endif %}>
+                <a href="{{ klass.url }}">{{ klass.name }}</a>
             </li>
         {% endwith %}
     {% else %}
-        <li id="module-{{ module.short_name }}" class="dropdown{% if module == this_module %} active{% endif %}">
+        <li id="module-{{ module.short_name }}" class="dropdown{% if module.active %} active{% endif %}">
             <a href="#module-{{ module.short_name }}" class="dropdown-toggle" data-toggle="dropdown">
                 {{ module.short_name|title }} <b class="caret"></b>
             </a>
             <ul class="dropdown-menu">
-                {% for klass in module.klass_set.all %}
-                    <li {% if klass == this_klass %}class=" active"{% endif %}>
-                        <a href="{{ klass.get_absolute_url }}">{{ klass }}</a>
+                {% for klass in module.classes %}
+                    <li {% if klass.active %}class=" active"{% endif %}>
+                        <a href="{{ klass.url }}">{{ klass.name }}</a>
                     </li>
                 {% endfor %}
             </ul>
         </li>
     {% endif %}
 {% endfor %}
+{% endsansdb %}

cbv/templatetags/cbv_tags.py

@@ -1,6 +1,7 @@
+import attrs
 from django import template
 
-from cbv.models import Klass, ProjectVersion
+from cbv.models import Klass, Module, ProjectVersion
 
 
 register = template.Library()
@@ -28,31 +29,80 @@ def namesake_methods(parent_klass, name):
     return result
 
 
+@attrs.frozen
+class OtherVersion:
+    name: str
+    url: str
+
+
+@attrs.frozen
+class ModuleData:
+    @attrs.frozen
+    class KlassData:
+        name: str
+        url: str
+        active: bool
+
+    source_name: str
+    short_name: str
+    classes: list[KlassData]
+    active: bool
+
+    @classmethod
+    def from_module(
+        cls, module: Module, active_module: Module | None, active_klass: Klass | None
+    ) -> "ModuleData":
+        return ModuleData(
+            source_name=module.source_name(),
+            short_name=module.short_name(),
+            classes=[
+                ModuleData.KlassData(
+                    name=klass.name,
+                    url=klass.get_absolute_url(),
+                    active=klass == active_klass,
+                )
+                for klass in module.klass_set.all()
+            ],
+            active=module == active_module,
+        )
+
+
 @register.inclusion_tag("cbv/includes/nav.html")
 def nav(version, module=None, klass=None):
     other_versions = ProjectVersion.objects.filter(project=version.project).exclude(
         pk=version.pk
     )
-    context = {
+    if klass:
+        other_versions_of_klass = Klass.objects.filter(
+            name=klass.name,
+            module__project_version__in=other_versions,
+        )
+        other_versions_of_klass_dict = {
+            x.module.project_version: x for x in other_versions_of_klass
+        }
+        version_switcher = []
+        for other_version in other_versions:
+            try:
+                other_klass = other_versions_of_klass_dict[other_version]
+            except KeyError:
+                url = other_version.get_absolute_url()
+            else:
+                url = other_klass.get_absolute_url()
+
+            version_switcher.append(OtherVersion(name=str(other_version), url=url))
+    else:
+        version_switcher = [
+            OtherVersion(name=str(other_version), url=other_version.get_absolute_url())
+            for other_version in other_versions
+        ]
+
+    modules = [
+        ModuleData.from_module(module=m, active_module=module, active_klass=klass)
+        for m in version.module_set.prefetch_related("klass_set")
+    ]
+
+    return {
         "version": version,
+        "other_versions": version_switcher,
+        "modules": modules,
     }
-    if module:
-        context["this_module"] = module
-        if klass:
-            context["this_klass"] = klass
-            other_versions_of_klass = Klass.objects.filter(
-                name=klass.name,
-                module__project_version__in=other_versions,
-            )
-            other_versions_of_klass_dict = {
-                x.module.project_version: x for x in other_versions_of_klass
-            }
-            for other_version in other_versions:
-                try:
-                    other_klass = other_versions_of_klass_dict[other_version]
-                except KeyError:
-                    pass
-                else:
-                    other_version.url = other_klass.get_absolute_url()
-    context["other_versions"] = other_versions
-    return context

cbv/tests/test_page_snapshots.py

@@ -12,17 +12,17 @@
 RENDERED_VIEWS = [
     (
         "homepage.html",
-        205,
+        190,
         reverse("home"),
     ),
     (
         "version-detail.html",
-        204,
+        189,
         reverse("version-detail", kwargs={"package": "django", "version": "4.0"}),
     ),
     (
         "module-detail.html",
-        27,
+        12,
         reverse(
             "module-detail",
             kwargs={
@@ -34,7 +34,7 @@
     ),
     (
         "klass-detail.html",
-        51,
+        36,
         reverse(
             "klass-detail",
             kwargs={
@@ -47,18 +47,18 @@
     ),
     (
         "klass-detail.html",
-        54,
+        39,
         reverse("klass-detail-shortcut", kwargs={"klass": "FormView"}),
     ),
     # Detail pages with wRonGLY CasEd arGuMEnTs
     (
         "fuzzy-version-detail.html",
-        204,
+        189,
         reverse("version-detail", kwargs={"package": "DJANGO", "version": "4.0"}),
     ),
     (
         "fuzzy-module-detail.html",
-        28,
+        13,
         reverse(
             "module-detail",
             kwargs={
@@ -70,7 +70,7 @@
     ),
     (
         "fuzzy-klass-detail.html",
-        51,
+        36,
         reverse(
             "klass-detail",
             kwargs={
@@ -83,7 +83,7 @@
     ),
     (
         "fuzzy-klass-detail.html",
-        54,
+        39,
         reverse("klass-detail-shortcut", kwargs={"klass": "fORMvIEW"}),
     ),
 ]

inspector/settings.py

@@ -19,6 +19,8 @@
     # Third Party Apps
     "django_extensions",
     "django_pygmy",
+    "sans_db",
+    # Django
     "django.contrib.auth",
     "django.contrib.contenttypes",
     "django.contrib.sessions",

requirements.in

@@ -1,10 +1,11 @@
-attrs
+attrs>=21.4.0
 blessings
 coverage[toml]
 django~=3.1.14
 dj-database-url
 django-extensions
 django-pygmy
+django-sans-db
 factory_boy
 gunicorn
 mypy

requirements.txt

@@ -6,7 +6,7 @@
 #
 asgiref==3.4.1
     # via django
-attrs==21.2.0
+attrs==21.4.0
     # via
     #   -r requirements.in
     #   pytest
@@ -34,6 +34,8 @@ django-extensions==3.1.3
     # via -r requirements.in
 django-pygmy==0.1.5
     # via -r requirements.in
+django-sans-db==1.1.0
+    # via -r requirements.in
 docutils==0.17.1
     # via sphinx
 factory-boy==3.2.0