Added views for invoices

Added class-based views for all operations
Added corresponding urls
Updated transaction page to use new views

nummi/main/models.py

@@ -66,6 +66,13 @@ class Transaction(models.Model):
     def get_absolute_url(self):
         return reverse("transaction", kwargs={"pk": self.pk})
 
+    def get_delete_url(self):
+        return reverse("del_transaction", kwargs={"pk": self.pk})
+
+    @property
+    def adding(self):
+        return self._state.adding
+
     @property
     def invoices(self):
         return Invoice.objects.filter(transaction=self)
@@ -112,15 +119,33 @@ class Invoice(models.Model):
         verbose_name=_("File"),
         max_length=128,
     )
-    transaction = models.ForeignKey(Transaction, on_delete=models.CASCADE)
+    transaction = models.ForeignKey(
+        Transaction, on_delete=models.CASCADE, editable=False
+    )
 
     def __str__(self):
-        return f"{self.name}: {self.transaction}"
+        if hasattr(self, "transaction"):
+            return f"{self.name} – {self.transaction.name}"
+        return self.name
 
     def delete(self, *args, **kwargs):
         self.file.delete()
         super().delete(*args, **kwargs)
 
+    def get_absolute_url(self):
+        return reverse(
+            "invoice", kwargs={"transaction_pk": self.transaction.pk, "pk": self.pk}
+        )
+
+    def get_delete_url(self):
+        return reverse(
+            "del_invoice", kwargs={"transaction_pk": self.transaction.pk, "pk": self.pk}
+        )
+
+    @property
+    def adding(self):
+        return self._state.adding
+
     class Meta:
         verbose_name = _("Invoice")
         verbose_name_plural = _("Invoices")
@@ -132,7 +157,7 @@ class InvoiceForm(ModelForm):
 
     class Meta:
         model = Invoice
-        fields = ["name", "file"]
+        fields = "__all__"
 
 
 def snapshot_path(instance, filename):