Fixed a performance issue with django's ORM

app/api/projects.py

@@ -6,7 +6,6 @@ from .tasks import TaskIDsSerializer
 
 
 class ProjectSerializer(serializers.ModelSerializer):
-    owner = serializers.PrimaryKeyRelatedField(queryset=User.objects.all())
     tasks = TaskIDsSerializer(many=True)
 
     class Meta:

app/api/tasks.py

@@ -16,6 +16,7 @@ class TaskIDsSerializer(serializers.BaseSerializer):
     def to_representation(self, obj):
         return obj.id
 
+
 class TaskSerializer(serializers.ModelSerializer):
     project = serializers.PrimaryKeyRelatedField(queryset=models.Project.objects.all())
     processing_node = serializers.PrimaryKeyRelatedField(queryset=ProcessingNode.objects.all()) 
@@ -26,7 +27,7 @@ class TaskSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = models.Task
-        exclude = ('processing_lock', 'console_output', )
+        exclude = ('processing_lock', 'console_output', 'orthophoto', )
 
 
 def get_and_check_project(request, project_pk, perms=('view_project',)):
@@ -48,7 +49,7 @@ class TaskViewSet(viewsets.ViewSet):
     A task represents a set of images and other input to be sent to a processing node.
     Once a processing node completes processing, results are stored in the task.
     """
-    queryset = models.Task.objects.all()
+    queryset = models.Task.objects.all().defer('orthophoto', 'console_output')
     
     # We don't use object level permissions on tasks, relying on
     # project's object permissions instead (but standard model permissions still apply)
@@ -157,10 +158,10 @@ class TaskViewSet(viewsets.ViewSet):
 class TaskTilesBase(APIView):
     queryset = models.Task.objects.all()
 
-    def get_and_check_task(self, request, pk, project_pk):
+    def get_and_check_task(self, request, pk, project_pk, defer=(None, )):
         get_and_check_project(request, project_pk)
         try:
-            task = self.queryset.get(pk=pk, project=project_pk)
+            task = self.queryset.defer(*defer).get(pk=pk, project=project_pk)
         except ObjectDoesNotExist:
             raise exceptions.NotFound()
         return task
@@ -171,7 +172,7 @@ class TaskTiles(TaskTilesBase):
         """
         Returns a prerendered orthophoto tile for a task
         """
-        task = self.get_and_check_task(request, pk, project_pk)
+        task = self.get_and_check_task(request, pk, project_pk, ('orthophoto', 'console_output'))
         tile_path = task.get_tile_path(z, x, y)
         if os.path.isfile(tile_path):
             tile = open(tile_path, "rb")

app/models.py

@@ -41,7 +41,7 @@ class Project(models.Model):
         return self.name
 
     def tasks(self, pk=None):
-        return Task.objects.filter(project=self);
+        return Task.objects.filter(project=self).only('id')
 
     class Meta:
         permissions = (

requirements.txt

@@ -2,6 +2,7 @@ anyjson==0.3.3
 APScheduler==3.2.0
 Django==1.10
 django-common-helpers==0.8.0
+django-debug-toolbar==1.6
 django-filter==0.15.3
 django-guardian==1.4.6
 django-webpack-loader==0.3.3
@@ -10,13 +11,14 @@ drf-nested-routers==0.11.1
 funcsigs==1.0.2
 futures==3.0.5
 Markdown==2.6.7
-pillow==3.3.1
+Pillow==3.3.1
 pip-autoremove==0.9.0
 psycopg2==2.6.2
 pytz==2016.6.1
 requests==2.11.1
 rfc3987==1.3.7
 six==1.10.0
+sqlparse==0.2.2
 strict-rfc3339==0.7
 tzlocal==1.3
 webcolors==1.5

webodm/settings.py

@@ -25,6 +25,7 @@ SECRET_KEY = 'gmarsutd!fee6_58=6k)2je#o2^&&)ovu1svjg8k^(a!7qa7r&'
 
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
+INTERNAL_IPS = ['127.0.0.1']
 
 ALLOWED_HOSTS = []
 
@@ -43,11 +44,13 @@ INSTALLED_APPS = [
     'rest_framework',
     'rest_framework_nested',
     'webpack_loader',
+#    'debug_toolbar',
     'app',
     'nodeodm',
 ]
 
 MIDDLEWARE = [
+   # 'debug_toolbar.middleware.DebugToolbarMiddleware',
     'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',

webodm/urls.py

@@ -15,6 +15,7 @@ Including another URLconf
 """
 from django.conf.urls import include, url
 from django.contrib import admin
+from . import settings
 
 admin.site.site_header = 'WebODM Administration'
 
@@ -23,3 +24,12 @@ urlpatterns = [
     url(r'^', include('django.contrib.auth.urls')),
     url(r'^admin/', admin.site.urls),
 ]
+
+if settings.DEBUG:
+    import debug_toolbar
+    urlpatterns += [
+        url(r'^__debug__/', include(debug_toolbar.urls)),
+    ]
+
+#from django.contrib.staticfiles.urls import staticfiles_urlpatterns
+#urlpatterns += staticfiles_urlpatterns()