chore: state delete validations endpoint (#880)

apiserver/plane/api/urls.py

@@ -79,6 +79,7 @@ from plane.api.views import (
     ## End Issues
     # States
     StateViewSet,
+    StateDeleteIssueCheckEndpoint,
     ## End States
     # Estimates
     EstimateViewSet,
@@ -509,6 +510,11 @@ urlpatterns = [
         ),
         name="project-state",
     ),
+    path(
+        "workspaces/<str:slug>/projects/<uuid:project_id>/states/<uuid:pk>/",
+        StateDeleteIssueCheckEndpoint.as_view(),
+        name="state-delete-check",
+    ),
     # End States ##
     #  States
     path(

apiserver/plane/api/views/__init__.py

@@ -42,7 +42,7 @@ from .workspace import (
     UserWorkspaceDashboardEndpoint,
     WorkspaceThemeViewSet,
 )
-from .state import StateViewSet
+from .state import StateViewSet, StateDeleteIssueCheckEndpoint
 from .shortcut import ShortCutViewSet
 from .view import IssueViewViewSet, ViewIssuesEndpoint, IssueViewFavoriteViewSet
 from .cycle import (

apiserver/plane/api/views/state.py

@@ -11,10 +11,10 @@ from sentry_sdk import capture_exception
 
 
 # Module imports
-from . import BaseViewSet
+from . import BaseViewSet, BaseAPIView
 from plane.api.serializers import StateSerializer
 from plane.api.permissions import ProjectEntityPermission
-from plane.db.models import State
+from plane.db.models import State, Issue
 
 
 class StateViewSet(BaseViewSet):
@@ -53,7 +53,10 @@ class StateViewSet(BaseViewSet):
             )
         except Exception as e:
             capture_exception(e)
-            return Response({"error": "Something went wrong please try again later"}, status=status.HTTP_400_BAD_REQUEST)
+            return Response(
+                {"error": "Something went wrong please try again later"},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
 
     def list(self, request, slug, project_id):
         try:
@@ -85,7 +88,37 @@ class StateViewSet(BaseViewSet):
                     {"error": "Default state cannot be deleted"}, status=False
                 )
 
+            # Check for any issues in the state
+            issue_exist = Issue.objects.filter(state=pk).exists()
+
+            if issue_exist:
+                return Response(
+                    {
+                        "error": "The state is not empty, only empty states can be deleted"
+                    },
+                    status=status.HTTP_400_BAD_REQUEST,
+                )
+
             state.delete()
             return Response(status=status.HTTP_204_NO_CONTENT)
         except State.DoesNotExist:
             return Response({"error": "State does not exists"}, status=status.HTTP_404)
+
+
+class StateDeleteIssueCheckEndpoint(BaseAPIView):
+    permission_classes = [
+        ProjectEntityPermission,
+    ]
+
+    def get(self, request, slug, project_id, pk):
+        try:
+            issue_count = Issue.objects.filter(
+                state=pk, workspace__slug=slug, project_id=project_id
+            ).count()
+            return Response({"issue_count": issue_count}, status=status.HTTP_200_OK)
+        except Exception as e:
+            capture_exception(e)
+            return Response(
+                {"error": "Something went wrong please try again later"},
+                status=status.HTTP_400_BAD_REQUEST,
+            )