feat(core): add a view for listing reversion version information

This commit adds a view to list versions overall or versions specific to
an instance. It also links to that view from the generic detail view of
the entities.

apis_core/apis_entities/templates/apis_entities/detail_views/detail_generic.html

@@ -70,6 +70,9 @@ <h2 style="text-align: center;">
                       <span class="material-symbols-outlined">content_copy</span>
                     </a>
                   {% endif %}
+		  | <a href="{% url 'apis_core:versions' object.self_contenttype.id object.id %}" title="History">
+                      <span class="material-symbols-outlined">history</span>
+		  </a>
                 {% endif %}
 
               {% endblock object-actions %}

apis_core/core/templates/reversion/version_list.html

@@ -0,0 +1,9 @@
+{% extends basetemplate %}
+
+{% block content %}
+<ul>
+  {% for version in object_list %}
+  <li>{{version.revision.date_created }} - {{ version.revision.user }}: {{ version.revision.get_comment }}</li>
+  {% endfor %}
+</ul>
+{% endblock content %}

apis_core/core/views.py

@@ -0,0 +1,21 @@
+from django.views.generic.list import ListView
+from django.contrib.contenttypes.models import ContentType
+from reversion.models import Revision, Version
+
+
+class Versions(ListView):
+    paginate_by = 100
+    model = Version
+    instance = None
+
+    def dispatch(self, request, *args, **kwargs):
+        if content_type := kwargs.get("content_type"):
+            contenttype = ContentType.objects.get_for_id(content_type)
+            if object_id := kwargs.get("object_id"):
+                self.instance = contenttype.model_class().objects.get(pk=object_id)
+        return super().dispatch(request, *args, **kwargs)
+
+    def get_queryset(self):
+        if self.instance:
+            return Version.objects.get_for_object(self.instance)
+        return Version.objects.all()

apis_core/urls.py

@@ -10,6 +10,8 @@
 from apis_core.api_routers import load_additional_serializers
 from apis_core.api_routers import views
 
+from apis_core.core.views import Versions
+
 # from apis_core.apis_entities.api_views import (
 #     NetJsonViewSet,
 #     PlaceGeoJsonViewSet,
@@ -185,6 +187,8 @@ def build_apis_mock_request(method, path, view, original_request, **kwargs):
     ),
     # url(r'^docs/', include('sphinxdoc.urls')),
     # url(r'^accounts/', include('registration.backends.simple.urls')),
+    path('reversion/versions/', Versions.as_view(), name="versions"),
+    path('reversion/versions/<int:content_type>/<int:object_id>', Versions.as_view(), name="versions"),
 ]
 
 if "apis_highlighter" in settings.INSTALLED_APPS: