Add a middleware to count queries

- https://www.dabapps.com/blog/logging-sql-queries-django-13/

InvenTree/InvenTree/middleware.py

@@ -1,5 +1,9 @@
 from django.shortcuts import HttpResponseRedirect
 from django.urls import reverse_lazy
+from django.db import connection
+import logging
+
+logger = logging.getLogger(__name__)
 
 
 class AuthRequiredMiddleware(object):
@@ -24,3 +28,40 @@ class AuthRequiredMiddleware(object):
         # the view is called.
 
         return response
+
+
+class QueryCountMiddleware(object):
+    """
+    This middleware will log the number of queries run
+    and the total time taken for each request (with a
+    status code of 200). It does not currently support
+    multi-db setups.
+
+    Reference: https://www.dabapps.com/blog/logging-sql-queries-django-13/
+    """
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+
+        response = self.get_response(request)
+
+        if response.status_code == 200:
+            total_time = 0
+
+            if len(connection.queries) > 0:
+
+                for query in connection.queries:
+                    query_time = query.get('time')
+                    if query_time is None:
+                        # django-debug-toolbar monkeypatches the connection
+                        # cursor wrapper and adds extra information in each
+                        # item in connection.queries. The query time is stored
+                        # under the key "duration" rather than "time" and is
+                        # in milliseconds, not seconds.
+                        query_time = query.get('duration', 0) / 1000
+                    total_time += float(query_time)
+
+                logger.debug('%s queries run, total %s seconds' % (len(connection.queries), total_time))
+        return response

InvenTree/InvenTree/settings.py

@@ -86,6 +86,9 @@ MIDDLEWARE = [
     'InvenTree.middleware.AuthRequiredMiddleware'
 ]
 
+if DEBUG:
+    MIDDLEWARE.append('InvenTree.middleware.QueryCountMiddleware')
+
 ROOT_URLCONF = 'InvenTree.urls'
 
 TEMPLATES = [

InvenTree/part/templates/part/part_base.html

@@ -85,25 +85,6 @@
             <td>{{ part.allocation_count }}</td>
         </tr>
         {% endif %}
-        {% if part.supplier_count > 0 %}
-        <tr>
-            <td>
-                Price
-            </td>
-            <td>
-                {% if part.min_single_price %}
-                {% if part.min_single_price == part.max_single_price %}
-                {{ part.min_single_price }}
-                {% else %}
-                {{ part.min_single_price }} to {{ part.max_single_price }}
-                {% endif %}
-                from {{ part.supplier_count }} suppliers.
-                {% else %}
-                <span class='warning-msg'><i>No pricing data avilable</i></span>
-                {% endif %}
-            </td>
-        </tr>
-        {% endif %}
     </table>
 </div>
 </div>