Display reimbursement amounts in grants admin

Update GrantAdmin to show approved reimbursements and total allocated amount.
Add utility methods to Grant model for checking reimbursement status.

Key changes:
- Add column for approved reimbursement categories and amounts
- Add inline editor for GrantReimbursement
- Add `total_allocated_amount` and `has_approved` helper methods
- Optimize queries with select_related and prefetch_related

Author: estyxx

backend/grants/admin.py

@@ -4,6 +4,10 @@
     create_addition_admin_log_entry,
     create_change_admin_log_entry,
 )
+from django.db.models import Value, IntegerField
+
+from django.db.models import Sum
+from django.db.models.functions import Coalesce
 from conferences.models.conference_voucher import ConferenceVoucher
 from pycon.constants import UTC
 from custom_admin.admin import (
@@ -402,6 +406,7 @@ def queryset(self, request, queryset):
 class GrantReimbursementCategoryAdmin(ConferencePermissionMixin, admin.ModelAdmin):
     list_display = ("__str__", "max_amount", "category", "included_by_default")
     list_filter = ("conference", "category", "included_by_default")
+    search_fields = ("category", "name")
 
 
 @admin.register(GrantReimbursement)
@@ -416,23 +421,32 @@ class GrantReimbursementAdmin(ConferencePermissionMixin, admin.ModelAdmin):
     autocomplete_fields = ("grant",)
 
 
+class GrantReimbursementInline(admin.TabularInline):
+    model = GrantReimbursement
+    extra = 0
+    autocomplete_fields = ["category"]
+    fields = ["category", "granted_amount"]
+
+
 @admin.register(Grant)
 class GrantAdmin(ExportMixin, ConferencePermissionMixin, admin.ModelAdmin):
     change_list_template = "admin/grants/grant/change_list.html"
     resource_class = GrantResource
     list_display = (
-        "user_display_name",
+        "user",
         "country",
         "is_proposed_speaker",
         "is_confirmed_speaker",
         "emoji_gender",
         "conference",
         "status",
         "approved_type",
+        "approved_amounts_display",
         "ticket_amount",
         "travel_amount",
         "accommodation_amount",
         "total_amount",
+        "total_amount_display",
         "country_type",
         "user_has_ticket",
         "has_voucher",
@@ -472,6 +486,7 @@ class GrantAdmin(ExportMixin, ConferencePermissionMixin, admin.ModelAdmin):
         "delete_selected",
     ]
     autocomplete_fields = ("user",)
+    inlines = [GrantReimbursementInline]
 
     fieldsets = (
         (
@@ -607,10 +622,22 @@ def user_has_ticket(self, obj: Grant) -> bool:
     def has_voucher(self, obj: Grant) -> bool:
         return obj.has_voucher
 
+    @admin.display(description="Total")
+    def total_amount_display(self, obj):
+        return f"{obj.total_allocated:.2f}"
+
+    @admin.display(description="Approved Reimbursements")
+    def approved_amounts_display(self, obj):
+        return ", ".join(
+            f"{r.category.name}: {r.granted_amount}" for r in obj.reimbursements.all()
+        )
+
     def get_queryset(self, request):
         qs = (
             super()
             .get_queryset(request)
+            .select_related("user")
+            .prefetch_related("reimbursements__category")
             .annotate(
                 is_proposed_speaker=Exists(
                     Submission.objects.non_cancelled().filter(
@@ -631,6 +658,11 @@ def get_queryset(self, request):
                         user_id=OuterRef("user_id"),
                     )
                 ),
+                total_allocated=Coalesce(
+                    Sum("reimbursements__granted_amount"),
+                    Value(0),
+                    output_field=IntegerField(),
+                ),
             )
         )
 

backend/grants/models.py

@@ -373,6 +373,13 @@ def has_approved_accommodation(self):
             or self.approved_type == Grant.ApprovedType.ticket_travel_accommodation
         )
 
+    @property
+    def total_allocated_amount(self):
+        return sum(r.allocated_amount for r in self.reimbursements.all())
+
+    def has_approved(self, type_):
+        return self.reimbursements.filter(category__category=type_).exists()
+
 
 class GrantReimbursement(models.Model):
     """Links a Grant to its reimbursement categories and stores the actual amount granted."""