From 8e82488f70cfcf8005e5b32045ea4e12be3fc122 Mon Sep 17 00:00:00 2001
From: Oliver Walters <oliver.henry.walters@gmail.com>
Date: Tue, 11 Jun 2019 21:58:20 +1000
Subject: [PATCH] Display 'net stock' value on front page

---
 InvenTree/part/models.py                     | 13 +++++++++++++
 InvenTree/static/css/inventree.css           |  4 ++++
 InvenTree/templates/required_part_table.html |  6 +++---
 3 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index 67a82a9504..4fd7360810 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -410,6 +410,19 @@ class Part(models.Model):
 
         return max(total, 0)
 
+    @property
+    def net_stock(self):
+        """ Return the 'net' stock. It takes into account:
+
+        - Stock on hand (total_stock)
+        - Stock on order (on_order)
+        - Stock allocated (allocation_count)
+
+        This number (unlike 'available_stock') can be negative.
+        """
+
+        return self.total_stock - self.allocation_count + self.on_order
+
     def isStarredBy(self, user):
         """ Return True if this part has been starred by a particular user """
 
diff --git a/InvenTree/static/css/inventree.css b/InvenTree/static/css/inventree.css
index 3bef992d34..2a98814dda 100644
--- a/InvenTree/static/css/inventree.css
+++ b/InvenTree/static/css/inventree.css
@@ -14,6 +14,10 @@
     color: #ffbb00;
 }
 
+.red-cell {
+    background-color: #ec7f7f;
+}
+
 .part-price {
     color: rgb(13, 245, 25);
 }
diff --git a/InvenTree/templates/required_part_table.html b/InvenTree/templates/required_part_table.html
index 6f21f5f7df..74feb07336 100644
--- a/InvenTree/templates/required_part_table.html
+++ b/InvenTree/templates/required_part_table.html
@@ -2,9 +2,9 @@
     <tr>
         <th>Part</th>
         <th>Description</th>
-        <th>Required</th>
         <th>In Stock</th>
         <th>On Order</th>
+        <th>Allocted</th>
         <th>Net Stock</th>
     </tr>
     {% for part in parts %}
@@ -14,10 +14,10 @@
             <a href="{% url 'part-detail' part.id %}">{{ part.full_name }}</a>
         </td>
         <td>{{ part.description }}</td>
-        <td>{{ part.allocation_count }}</td>
         <td>{{ part.total_stock }}</td>
         <td>{{ part.on_order }}</td>
-        <td>{{ part.available_stock }}</td>
+        <td>{{ part.allocation_count }}</td>
+        <td{% if part.net_stock < 0 %} class='red-cell'{% endif %}>{{ part.net_stock }}</td>
     </tr>
     {% endfor %}
 </table>
\ No newline at end of file