Created part.tasks file and moved notify_low_stock function to the same from InvenTree.tasks. The argument type is changed from StockItem to Part

Added trans to headers of table in email template of low_stock_notification.html

added is_part_low_on_stock() function to the part model to check if the part's stock has fallen below the minimum quantity

used offload_task function to run the low stock notification function asynchronously

InvenTree/InvenTree/tasks.py

@@ -310,30 +310,3 @@ def send_email(subject, body, recipients, from_email=None, html_message=None):
         fail_silently=False,
         html_message=html_message
     )
-
-
-def notify_low_stock(stock_item):
-    """
-    Notify users who have starred a part when its stock quantity falls below the minimum threshold
-    """
-
-    from allauth.account.models import EmailAddress
-    starred_users = EmailAddress.objects.filter(user__starred_parts__part=stock_item.part)
-
-    if len(starred_users) > 0:
-        logger.info(f"Notify users regarding low stock of {stock_item.part.name}")
-        context = {
-            'part_name': stock_item.part.name,
-            # Part url can be used to open the page of part in application from the email.
-            # It can be facilitated when the application base url is accessible programmatically.
-            # 'part_url': f'{application_base_url}/part/{stock_item.part.id}',
-
-            # quantity is in decimal field datatype. Since the same datatype is used in models,
-            # it is not converted to number/integer,
-            'part_quantity': stock_item.quantity,
-            'minimum_quantity': stock_item.part.minimum_stock
-        }
-        subject = _(f'Attention! {stock_item.part.name} is low on stock')
-        html_message = render_to_string('stock/low_stock_notification.html', context)
-        recipients = starred_users.values_list('email', flat=True)
-        send_email(subject, '', recipients, html_message=html_message)

InvenTree/part/models.py

@@ -1988,6 +1988,9 @@ class Part(MPTTModel):
     def related_count(self):
         return len(self.get_related_parts())
 
+    def is_part_low_on_stock(self):
+        return self.total_stock <= self.minimum_stock
+
 
 def attach_file(instance, filename):
     """ Function for storing a file for a PartAttachment

InvenTree/part/tasks.py

@@ -0,0 +1,39 @@
+# Author: Roche Christopher
+# Created at 10:26 AM on 31/10/21
+
+import logging
+
+from django.utils.translation import ugettext_lazy as _
+from django.template.loader import render_to_string
+
+from InvenTree import tasks as inventree_tasks
+from part.models import Part
+
+logger = logging.getLogger("inventree")
+
+
+def notify_low_stock(part: Part):
+    """
+    Notify users who have starred a part when its stock quantity falls below the minimum threshold
+    """
+
+    from allauth.account.models import EmailAddress
+    starred_users_email = EmailAddress.objects.filter(user__starred_parts__part=part)
+
+    if len(starred_users_email) > 0:
+        logger.info(f"Notify users regarding low stock of {part.name}")
+        context = {
+            'part_name': part.name,
+            # Part url can be used to open the page of part in application from the email.
+            # It can be facilitated when the application base url is accessible programmatically.
+            # 'part_url': f'{application_base_url}/part/{stock_item.part.id}',
+
+            # quantity is in decimal field datatype. Since the same datatype is used in models,
+            # it is not converted to number/integer,
+            'part_quantity': part.total_stock,
+            'minimum_quantity': part.minimum_stock
+        }
+        subject = _(f'Attention! {part.name} is low on stock')
+        html_message = render_to_string('stock/low_stock_notification.html', context)
+        recipients = starred_users_email.values_list('email', flat=True)
+        inventree_tasks.send_email(subject, '', recipients, html_message=html_message)

InvenTree/stock/models.py

@@ -1659,8 +1659,11 @@ def after_save_stock_item(sender, instance: StockItem, **kwargs):
     starred the part
     """
 
-    if instance.quantity <= instance.part.minimum_stock:
-        inventree_tasks.notify_low_stock(instance)
+    if instance.part.is_part_low_on_stock():
+        inventree_tasks.offload_task(
+            'part.tasks.notify_low_stock',
+            instance.part
+        )
 
 
 class StockItemAttachment(InvenTreeAttachment):

InvenTree/stock/templates/stock/low_stock_notification.html

@@ -5,13 +5,13 @@
 <table style="border-collapse:collapse; width: 80%;margin-left: 10%; font-size: 1rem">
 
     <tr style="background: aliceblue; height: 4rem;">
-        <th colspan="3" style="padding-bottom: 1rem; font-size: 1.5rem; color:rgb(210,0, 0)">Part low on stock</th>
+        <th colspan="3" style="padding-bottom: 1rem; font-size: 1.5rem; color:rgb(210,0, 0)">{%  trans "Part low on stock" %}</th>
     </tr>
 
     <tr style="height: 3rem; border-bottom: 1px solid">
-        <th>Part Name</th>
-        <th>Available Quantity</th>
-        <th>Minimum Quantity</th>
+        <th>{% trans "Part Name" %}</th>
+        <th>{% trans "Available Quantity" %}</th>
+        <th>{% trans "Minimum Quantity" %}</th>
     </tr>
 
     <tr style="height: 3rem">