From ef7a9b5152096d693871820083a7e31481d716d9 Mon Sep 17 00:00:00 2001
From: Oliver <oliver.henry.walters@gmail.com>
Date: Sat, 27 Nov 2021 00:11:18 +1100
Subject: [PATCH] Adds a simple endpoint for accessing serial number
 information for a Part instance

- This is not included by default in the "part detail" endpoint as it must be calculated!
---
 InvenTree/part/api.py                         | 38 ++++++++++++++++++-
 .../stock/templates/stock/item_base.html      |  1 +
 InvenTree/templates/js/translated/api.js      |  1 +
 InvenTree/templates/js/translated/stock.js    | 14 +++++++
 4 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/InvenTree/part/api.py b/InvenTree/part/api.py
index 00b5dfa7de..403934d3d9 100644
--- a/InvenTree/part/api.py
+++ b/InvenTree/part/api.py
@@ -42,7 +42,7 @@ from build.models import Build
 
 from . import serializers as part_serializers
 
-from InvenTree.helpers import str2bool, isNull
+from InvenTree.helpers import str2bool, isNull, increment
 from InvenTree.api import AttachmentMixin
 
 from InvenTree.status_codes import BuildStatus
@@ -410,6 +410,33 @@ class PartThumbsUpdate(generics.RetrieveUpdateAPIView):
     ]
 
 
+class PartSerialNumberDetail(generics.RetrieveAPIView):
+    """
+    API endpoint for returning extra serial number information about a particular part
+    """
+
+    queryset = Part.objects.all()
+
+    def retrieve(self, request, *args, **kwargs):
+
+        part = self.get_object()
+
+        # Calculate the "latest" serial number
+        latest = part.getLatestSerialNumber()
+
+        data = {
+            'latest': latest,
+        }
+
+        if latest is not None:
+            next = increment(latest)
+
+            if next != increment:
+                data['next'] = next
+
+        return Response(data)
+
+
 class PartDetail(generics.RetrieveUpdateDestroyAPIView):
     """ API endpoint for detail view of a single Part object """
 
@@ -1532,7 +1559,14 @@ part_api_urls = [
         url(r'^(?P<pk>\d+)/?', PartThumbsUpdate.as_view(), name='api-part-thumbs-update'),
     ])),
 
-    url(r'^(?P<pk>\d+)/', PartDetail.as_view(), name='api-part-detail'),
+    url(r'^(?P<pk>\d+)/', include([
+
+        # Endpoint for extra serial number information
+        url(r'^serial-numbers/', PartSerialNumberDetail.as_view(), name='api-part-serial-number-detail'),
+
+        # Part detail endpoint
+        url(r'^.*$', PartDetail.as_view(), name='api-part-detail'),
+    ])),
 
     url(r'^.*$', PartList.as_view(), name='api-part-list'),
 ]
diff --git a/InvenTree/stock/templates/stock/item_base.html b/InvenTree/stock/templates/stock/item_base.html
index 0f8d81203a..111007cd71 100644
--- a/InvenTree/stock/templates/stock/item_base.html
+++ b/InvenTree/stock/templates/stock/item_base.html
@@ -433,6 +433,7 @@
 $("#stock-serialize").click(function() {
 
     serializeStockItem({{ item.pk }}, {
+        part: {{ item.part.pk }},
         reload: true,
         data: {
             quantity: {{ item.quantity }},
diff --git a/InvenTree/templates/js/translated/api.js b/InvenTree/templates/js/translated/api.js
index 735ce0a676..d9c23f035f 100644
--- a/InvenTree/templates/js/translated/api.js
+++ b/InvenTree/templates/js/translated/api.js
@@ -54,6 +54,7 @@ function inventreeGet(url, filters={}, options={}) {
         data: filters,
         dataType: 'json',
         contentType: 'application/json',
+        async: (options.async == false) ? false : true,
         success: function(response) {
             if (options.success) {
                 options.success(response);
diff --git a/InvenTree/templates/js/translated/stock.js b/InvenTree/templates/js/translated/stock.js
index c624278c93..e5a59d7767 100644
--- a/InvenTree/templates/js/translated/stock.js
+++ b/InvenTree/templates/js/translated/stock.js
@@ -80,6 +80,20 @@ function serializeStockItem(pk, options={}) {
         notes: {},
     };
 
+    if (options.part) {
+        // Work out the next available serial number
+        inventreeGet(`/api/part/${options.part}/serial-numbers/`, {}, {
+            success: function(data) {
+                if (data.next) {
+                    options.fields.serial_numbers.placeholder = `{% trans "Next available serial number" %}: ${data.next}`;
+                } else if (data.latest) {
+                    options.fields.serial_numbers.placeholder = `{% trans "Latest serial number" %}: ${data.latest}`;
+                }
+            },
+            async: false,
+        });
+    }
+
     constructForm(url, options);
 }