feat: add TreeView and its endpoint

backend/kernelCI/urls.py

@@ -16,8 +16,9 @@
 """
 
 from django.contrib import admin
-from django.urls import path
+from django.urls import path, include
 
 urlpatterns = [
     path("admin/", admin.site.urls),
+    path('api/', include('kernelCI_app.urls')),
 ]

backend/kernelCI_app/urls.py

@@ -0,0 +1,7 @@
+from django.urls import path
+from kernelCI_app import views
+
+
+urlpatterns = [
+    path('tree/', views.TreeView.as_view(), name='tree')
+]

backend/kernelCI_app/views.py

@@ -1,3 +1,16 @@
-# from django.shortcuts import render
+from django.http import JsonResponse
+from django.views import View
 
-# Create your views here.
+from kernelCI_app.models import Checkouts
+from kernelCI_app.serializers import TreeSerializer
+from kernelCI_app.utils import get_visible_record_ids
+
+
+class TreeView(View):
+
+    def get(self, _):
+        checkout_ids = get_visible_record_ids('checkouts')
+        checkouts = Checkouts.objects.filter(id__in=checkout_ids)
+        serializer = TreeSerializer(checkouts, many=True)
+
+        return JsonResponse(serializer.data, safe=False)