Add link from the NN Re-assigned install to the node that got its number

src/meshapi/admin/models/install.py

@@ -12,7 +12,7 @@
 from simple_history.admin import SimpleHistoryAdmin
 
 from meshapi.models import Install
-from meshapi.widgets import ExternalHyperlinkWidget
+from meshapi.widgets import ExternalHyperlinkWidget, InstallStatusWidget
 
 from ..ranked_search import RankedSearchMixin
 
@@ -40,8 +40,13 @@ class Meta:
                 lambda ticket_number: f"{OSTICKET_URL}/scp/tickets.php?number={ticket_number}",
                 title="View in OSTicket",
             ),
+            "status": InstallStatusWidget(),
         }
 
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
+        super().__init__(*args, **kwargs)
+        self.fields["status"].widget.form_instance = self
+
 
 @admin.register(Install)
 class InstallAdmin(RankedSearchMixin, ImportExportMixin, ExportActionMixin, SimpleHistoryAdmin):

src/meshapi/templates/widgets/install_status.html

@@ -0,0 +1,15 @@
+{% load i18n static %}
+<div class="related-widget-wrapper">
+    {% include "django/forms/widgets/select.html" %}
+    {% if reassigned_node_id %}
+        {% block links %}
+        {% spaceless %}
+        <a class="related-widget-wrapper-link view-related"
+           href="/admin/meshapi/node/{{ reassigned_node_id }}"
+            title="{% blocktranslate %}Show the node that got this install's number{% endblocktranslate %}">
+            <img src="{% static 'admin/img/icon-viewlink.svg' %}" alt="{% translate 'Navigate' %}">
+        </a>
+        {% endspaceless %}
+        {% endblock %}
+    {% endif %}
+</div>

src/meshapi/tests/test_admin_change_view.py

@@ -642,6 +642,25 @@ def test_change_building_address(self):
         self.assertEqual(building.primary_node, self.node1)
         self.assertEqual(list(building.nodes.all()), [self.node1])
 
+    def test_install_hyperlinks_to_nn_assigned_node(self):
+        old_install = Install(**sample_install)
+        old_install.install_number = 741
+        old_install.member = self.member
+        old_install.building = self.building_1
+        old_install.status = Install.InstallStatus.NN_REASSIGNED
+        old_install.save()
+
+        new_node = Node(**sample_node)
+        new_node.network_number = old_install.install_number
+        new_node.save()
+
+        change_url = f"/admin/meshapi/install/{old_install.id}/change/"
+        response = self._call(change_url, 200)
+        form_soup = bs4.BeautifulSoup(response.content.decode()).find(id="install_form")
+        link_tag = form_soup.find("select", {"id": "id_status"}).parent.find("a")
+        self.assertEqual(link_tag.attrs["href"], f"/admin/meshapi/node/{new_node.id}")
+        self.assertEqual(link_tag.attrs["title"], "Show the node that got this install's number")
+
 
 class TestAdminAddView(TestCase):
     def setUp(self):

src/meshapi/widgets.py

@@ -9,6 +9,8 @@
 from django_jsonform.widgets import JSONFormWidget
 from flags.state import flag_enabled
 
+from meshapi.models import Install, Node
+
 
 class PanoramaViewer(JSONFormWidget):
     pano_template_name = "widgets/panorama_viewer.html"
@@ -93,6 +95,22 @@ class UISPHyperlinkWidget(widgets.TextInput):
     template_name = "widgets/uisp_link.html"
 
 
+class InstallStatusWidget(widgets.Select):
+    template_name = "widgets/install_status.html"
+    form_instance: "InstallAdminForm"
+
+    def get_context(self, name: str, value: str, attrs: Optional[dict] = None) -> dict:
+        context = super().get_context(name, value, attrs)
+        if self.form_instance:
+            install = self.form_instance.instance
+            if install and install.status == Install.InstallStatus.NN_REASSIGNED:
+                recycled_as_node = Node.objects.filter(network_number=install.install_number).first()
+                if recycled_as_node:
+                    context["reassigned_node_id"] = str(recycled_as_node.id)
+
+        return context
+
+
 class AutoPopulateLocationWidget(forms.Widget):
     template_name = "widgets/auto_populate_location.html"
 
@@ -111,3 +129,7 @@ def get_context(self, name: str, value: str, attrs: Optional[dict] = None) -> di
         context["auto_populate_source"] = self.source
         context["auto_populate_url"] = self.source
         return context
+
+
+# Down here to resolve circular imports
+from meshapi.admin.models.install import InstallAdminForm  # noqa: E402