8927 plugin search (#10489)

* #7016 base search classes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 8927 refactor search

* 8927 refactor search

* 8927 refactor search

* 8927 refactor search

* 8927 get search choices working

* 8927 cleanup - optimize

* 8927 use backend search function

* 8927 fix for plugin search

* 8927 add docs

* Move search app to a module under netbox/

* Utilize global registry to register model search classes

* Build search form options from registry

* Determine search categories from model app by default

* Enable dynamic search registration for plugins

* Update docs & improve plugin support

* Clean up search backend class

* Docs for #8927

Co-authored-by: jeremystretch <jstretch@ns1.com>

netbox/tenancy/apps.py

@@ -3,3 +3,6 @@ from django.apps import AppConfig
 
 class TenancyConfig(AppConfig):
     name = 'tenancy'
+
+    def ready(self):
+        from . import search

netbox/tenancy/search.py

@@ -0,0 +1,25 @@
+import tenancy.filtersets
+import tenancy.tables
+from netbox.search import SearchIndex, register_search
+from tenancy.models import Contact, ContactAssignment, Tenant
+from utilities.utils import count_related
+
+
+@register_search()
+class TenantIndex(SearchIndex):
+    model = Tenant
+    queryset = Tenant.objects.prefetch_related('group')
+    filterset = tenancy.filtersets.TenantFilterSet
+    table = tenancy.tables.TenantTable
+    url = 'tenancy:tenant_list'
+
+
+@register_search()
+class ContactIndex(SearchIndex):
+    model = Contact
+    queryset = Contact.objects.prefetch_related('group', 'assignments').annotate(
+        assignment_count=count_related(ContactAssignment, 'contact')
+    )
+    filterset = tenancy.filtersets.ContactFilterSet
+    table = tenancy.tables.ContactTable
+    url = 'tenancy:contact_list'