Admin improvements (#11)

* Add the group column to OrmQ admin page

* Add group field to tasks list and search_field

* Add search by name to Schedule admin page

* Limit succesful task history per schedule with SAVE_LIMIT_GROUP config

* Improve ScheduleAdmin list view performance

Co-authored-by: Marc Sabatier <marc@sabatier.online>

django_q/admin.py

@@ -1,16 +1,19 @@
 """Admin module for Django."""
+from django.urls import reverse
+from django.utils.html import format_html
 from django.contrib import admin
 from django.utils.translation import gettext_lazy as _
+from django.db.models.expressions import OuterRef, Subquery
 
 from django_q.conf import Conf, croniter
-from django_q.models import Failure, OrmQ, Schedule, Success
+from django_q.models import Failure, OrmQ, Schedule, Success, Task
 from django_q.tasks import async_task
 
 
 class TaskAdmin(admin.ModelAdmin):
     """model admin for success tasks."""
 
-    list_display = ("name", "func", "started", "stopped", "time_taken", "group")
+    list_display = ("name", "group", "func", "started", "stopped", "time_taken")
 
     def has_add_permission(self, request):
         """Don't allow adds."""
@@ -43,14 +46,14 @@ retry_failed.short_description = _("Resubmit selected tasks to queue")
 class FailAdmin(admin.ModelAdmin):
     """model admin for failed tasks."""
 
-    list_display = ("name", "func", "started", "stopped", "short_result")
+    list_display = ("name", "group", "func", "started", "stopped", "short_result")
 
     def has_add_permission(self, request):
         """Don't allow adds."""
         return False
 
     actions = [retry_failed]
-    search_fields = ("name", "func")
+    search_fields = ("name", "func", "group")
     list_filter = ("group",)
     readonly_fields = []
 
@@ -70,8 +73,8 @@ class ScheduleAdmin(admin.ModelAdmin):
         "repeats",
         "cluster",
         "next_run",
-        "last_run",
-        "success",
+        "get_last_run",
+        "get_success",
     )
 
     # optional cron strings
@@ -79,14 +82,37 @@ class ScheduleAdmin(admin.ModelAdmin):
         readonly_fields = ("cron",)
 
     list_filter = ("next_run", "schedule_type", "cluster")
-    search_fields = ("func",)
+    search_fields = ("name", "func",)
     list_display_links = ("id", "name")
 
+    def get_queryset(self, request):
+        qs = super().get_queryset(request)
+        task_query = Task.objects.filter(id=OuterRef('task')).values('id', 'name', 'success')
+        qs = qs.annotate(task_id=Subquery(task_query.values('id')), task_name=Subquery(task_query.values('name')),
+                         task_success=Subquery(task_query.values('success')))
+        return qs
+
+    def get_success(self, obj):
+        return obj.task_success
+    get_success.boolean = True
+    get_success.short_description = _("success")
+
+    def get_last_run(self, obj):
+        if obj.task_name is not None:
+            if obj.task_success:
+                url = reverse("admin:django_q_success_change", args=(obj.task_id,))
+            else:
+                url = reverse("admin:django_q_failure_change", args=(obj.task_id,))
+            return format_html(f'<a href="{url}">[{obj.task_name}]</a>')
+        return None
+    get_last_run.allow_tags = True
+    get_last_run.short_description = _("last_run")
+
 
 class QueueAdmin(admin.ModelAdmin):
     """queue admin for ORM broker"""
 
-    list_display = ("id", "key", "task_id", "name", "func", "lock")
+    list_display = ("id", "key", "name",  "group", "func", "lock", "task_id")
 
     def save_model(self, request, obj, form, change):
         obj.save(using=Conf.ORM)