From e43439ef5b6bd0b89c394fbdf1a08cb40d7e4963 Mon Sep 17 00:00:00 2001
From: Oliver <oliver.henry.walters@gmail.com>
Date: Mon, 16 Apr 2018 21:49:38 +1000
Subject: [PATCH] Function to calculate how many parts can be made with current
 stock

---
 InvenTree/part/models.py                     | 38 +++++++++++++++++---
 InvenTree/part/templates/part/bom.html       |  2 +-
 InvenTree/part/templates/part/delete.html    |  4 +--
 InvenTree/part/templates/part/part_base.html | 10 ++++--
 InvenTree/part/templates/part/tabs.html      |  8 ++---
 5 files changed, 49 insertions(+), 13 deletions(-)

diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index d9bdc50311..bf421cef3b 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -132,8 +132,34 @@ class Part(models.Model):
         verbose_name_plural = "Parts"
 
     @property
-    def tracked_parts(self):
-        return self.serials.order_by('serial')
+    def available_stock(self):
+        """
+        Return the total available stock.
+        This subtracts stock which is already allocated
+        """
+
+        # TODO - For now, just return total stock count
+        return self.stock
+
+    @property
+    def can_build(self):
+        """ Return the number of units that can be build with available stock
+        """
+
+        # If this part does NOT have a BOM, result is simply the currently available stock
+        if not self.has_bom:
+            return self.available_stock
+
+        total = None
+
+        for item in self.bom_items.all():
+            stock = item.sub_part.available_stock
+            n = int(1.0 * stock / item.quantity)
+
+            if total is None or n < total:
+                total = n
+
+        return total
 
     @property
     def stock(self):
@@ -149,11 +175,15 @@ class Part(models.Model):
         return result['total']
 
     @property
-    def bomItemCount(self):
+    def has_bom(self):
+        return self.bom_item_count > 0
+
+    @property
+    def bom_item_count(self):
         return self.bom_items.all().count()
 
     @property
-    def usedInCount(self):
+    def used_in_count(self):
         return self.used_in.all().count()
 
     """
diff --git a/InvenTree/part/templates/part/bom.html b/InvenTree/part/templates/part/bom.html
index 24046b5ca4..31ae8919bd 100644
--- a/InvenTree/part/templates/part/bom.html
+++ b/InvenTree/part/templates/part/bom.html
@@ -15,7 +15,7 @@
 <tr>
     <td><a href="{% url 'part-detail' sub_part.id %}">{{ sub_part.name }}</a></td>
     <td>{{ sub_part.description }}</td>
-    <td>{{ bom_item.quantity }}</td>
+    <td>{{ bom_item.quantity }}<span class='badge'>{{ bom_item.sub_part.available_stock }}</span></td>
 </tr>
 {% endwith %}
 {% endfor %}
diff --git a/InvenTree/part/templates/part/delete.html b/InvenTree/part/templates/part/delete.html
index df28dc82d8..5e536508d9 100644
--- a/InvenTree/part/templates/part/delete.html
+++ b/InvenTree/part/templates/part/delete.html
@@ -7,8 +7,8 @@
 
 {% block del_body %}
 
-    {% if part.usedInCount > 0 %}
-    <p>This part is used in BOMs for {{ part.usedInCount }} other parts. If you delete this part, the BOMs for the following parts will be updated:
+    {% if part.used_in_count %}
+    <p>This part is used in BOMs for {{ part.used_in_count }} other parts. If you delete this part, the BOMs for the following parts will be updated:
     <ul class="list-group">
         {% for child in part.used_in.all %}
         <li class='list-group-item'>{{ child.part.name }} - {{ child.part.description }}</li>
diff --git a/InvenTree/part/templates/part/part_base.html b/InvenTree/part/templates/part/part_base.html
index 7cd4120f44..7df825c3bb 100644
--- a/InvenTree/part/templates/part/part_base.html
+++ b/InvenTree/part/templates/part/part_base.html
@@ -40,9 +40,15 @@
         </tr>
         {% endif %}
         <tr>
-            <td>Stock</td>
-            <td>{{ part.stock }}</td>
+            <td>Available Stock</td>
+            <td>{{ part.available_stock }}</td>
         </tr>
+        {% if part.has_bom %}
+        <tr>
+            <td>Can Build</td>
+            <td>{{ part.can_build }}</td>
+        </tr>
+        {% endif %}
     </table>
 </div>
 </div>
diff --git a/InvenTree/part/templates/part/tabs.html b/InvenTree/part/templates/part/tabs.html
index 64e5089f10..073460e58a 100644
--- a/InvenTree/part/templates/part/tabs.html
+++ b/InvenTree/part/templates/part/tabs.html
@@ -1,11 +1,11 @@
 <ul class="nav nav-tabs">
     <li{% ifequal tab 'detail' %} class="active"{% endifequal %}><a href="{% url 'part-detail' part.id %}">Details</a></li>
-    <li{% ifequal tab 'bom' %} class="active"{% endifequal %}><a href="{% url 'part-bom' part.id %}">BOM{% if part.bomItemCount > 0 %}<span class="badge">{{ part.bomItemCount }}</span>{% endif %}</a></li>
-    {% if part.bomItemCount > 0 %}
+    <li{% ifequal tab 'bom' %} class="active"{% endifequal %}><a href="{% url 'part-bom' part.id %}">BOM{% if part.has_bom > 0 %}<span class="badge">{{ part.bom_item_cout }}</span>{% endif %}</a></li>
+    {% if part.has_bom %}
     <li{% ifequal tab 'build' %} class "active"{% endifequal %}><a href="#">Build</a></li>
     {% endif %}
-    {% if part.usedInCount > 0 %}
-    <li{% ifequal tab 'used' %} class="active"{% endifequal %}><a href="{% url 'part-used-in' part.id %}">Used In{% if part.usedInCount > 0 %}<span class="badge">{{ part.usedInCount }}</span>{% endif %}</a></li>
+    {% if part.used_in_count > 0 %}
+    <li{% ifequal tab 'used' %} class="active"{% endifequal %}><a href="{% url 'part-used-in' part.id %}">Used In{% if part.used_in_count > 0 %}<span class="badge">{{ part.used_in_count }}</span>{% endif %}</a></li>
     {% endif %}
     <li{% ifequal tab 'stock' %} class="active"{% endifequal %}><a href="{% url 'part-stock' part.id %}">Stock <span class="badge">{{ part.stock }}</span></a></li>
     {% if part.purchaseable %}