prvi kod za live uporabu

backend/modules/invoicing/admin.py

@@ -0,0 +1,43 @@
+# backend/modules/invoicing/admin.py
+
+from django.contrib import admin
+from .models import InvoiceTransaction
+
+@admin.register(InvoiceTransaction)
+class InvoiceTransactionEntryAdmin(admin.ModelAdmin):
+    """
+    Konfiguracija prikaza financijskih zapisa u Admin panelu.
+    """
+    # Prikaz stupaca u listi
+    list_display = ('invoice_number', 'work_order_ref', 'amount', 'created_at', 'is_active')
+    
+    # Omogućuje brzo filtriranje
+    list_filter = ('created_at', 'is_active', 'work_order')
+    list_select_related = ('work_order__vehicle',)
+    
+    # Omogućuje pretragu
+    search_fields = ('invoice_number', 'work_order__id', 'work_order__vehicle__registration_number')
+    
+    # Polja koja se ne smiju mijenjati u adminu
+    readonly_fields = ('id', 'created_at', 'updated_at')
+
+    # Grupiranje polja za lakši pregled
+    fieldsets = (
+        (None, {
+            'fields': ('invoice_number', 'work_order', 'amount', 'payment_date', 'is_active')
+        }),
+        ('Sustavni podaci', {
+            'fields': ('id', 'created_at', 'updated_at'),
+            'classes': ('collapse',)
+        }),
+    )
+
+    @admin.display(description="Povezani putni nalog")
+    def work_order_ref(self, obj):
+        if not obj.work_order_id:
+            return "—"
+        short_id = str(obj.work_order_id).split('-')[0].upper()
+        registration = getattr(obj.work_order.vehicle, 'registration_number', '')
+        if registration:
+            return f"WO-{short_id} ({registration})"
+        return f"WO-{short_id}"