feat(apis_entities): add endpoint that lists all entities

Closes: #850

apis_core/apis_entities/api_views.py

@@ -1,8 +1,12 @@
 from django.shortcuts import redirect
+from django.db.models import Q
 from rest_framework.views import APIView
 from rest_framework.exceptions import NotFound
+from rest_framework.generics import ListAPIView
 
 from apis_core.apis_metainfo.models import RootObject
+from apis_core.apis_entities.serializers import MinimalEntitySerializer
+from apis_core.apis_entities.utils import get_entity_classes
 
 
 class GetEntityGeneric(APIView):
@@ -12,3 +16,15 @@ def get(self, request, pk):
             return redirect(obj.get_api_detail_endpoint())
         except RootObject.DoesNotExist:
             raise NotFound
+
+
+class ListEntityGeneric(ListAPIView):
+    serializer_class = MinimalEntitySerializer
+
+    def get_queryset(self):
+        entities = get_entity_classes()
+        entities = [entity._meta.model_name for entity in entities]
+        q = Q()
+        for entity in entities:
+            q |= Q(**{f"{entity}__isnull": False})
+        return RootObject.objects_inheritance.select_subclasses().filter(q)

apis_core/apis_entities/serializers.py

@@ -0,0 +1,10 @@
+from rest_framework import serializers
+from apis_core.generic.serializers import GenericHyperlinkedIdentityField
+
+
+class MinimalEntitySerializer(serializers.Serializer):
+    uri = GenericHyperlinkedIdentityField(view_name="apis_core:generic:genericmodelapi-detail")
+    name = serializers.SerializerMethodField(method_name="get_name")
+
+    def get_name(self, object):
+        return str(object)

apis_core/apis_entities/utils.py

@@ -0,0 +1,6 @@
+from django.apps import apps
+from apis_core.apis_entities.models import AbstractEntity
+
+
+def get_entity_classes():
+    return list(filter(lambda x: issubclass(x, AbstractEntity), apps.get_models()))

apis_core/urls.py

@@ -10,7 +10,7 @@
 
 from apis_core.apis_metainfo.viewsets import UriToObjectViewSet
 from apis_core.core.views import Dumpdata
-from apis_core.apis_entities.api_views import GetEntityGeneric
+from apis_core.apis_entities.api_views import GetEntityGeneric, ListEntityGeneric
 
 from drf_spectacular.views import (
     SpectacularAPIView,
@@ -67,6 +67,7 @@
         GetEntityGeneric.as_view(),
         name="GetEntityGeneric",
     ),
+    path("entities/", ListEntityGeneric.as_view()),
     path("api/dumpdata", Dumpdata.as_view()),
     path("", include("apis_core.generic.urls", namespace="generic")),
 ]