add SetApplicationName middleware for nav use

procat2/middleware.py

@@ -0,0 +1,13 @@
+# https://docs.djangoproject.com/en/2.1/topics/http/middleware/
+# https://stackoverflow.com/questions/12596722/django-identify-app-in-template
+
+class SetApplicationName(object):
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        return self.get_response(request)
+
+    def process_view(self, request, view_func, view_args, view_kwargs):
+        request.current_app = view_func.__module__.split('.')[0]

procat2/settings.py

@@ -46,6 +46,7 @@ MIDDLEWARE = [
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
+    'procat2.middleware.SetApplicationName',
 ]
 
 ROOT_URLCONF = 'procat2.urls'
@@ -54,8 +55,7 @@ TEMPLATES = [
     {
         'BACKEND': 'django.template.backends.django.DjangoTemplates',
         'DIRS': ['templates'],
-        #'APP_DIRS': True,
-        #'DIRS': [os.path.join(BASE_DIR, 'templates')],
+        'APP_DIRS': True,
         'OPTIONS': {
             'context_processors': [
                 'django.template.context_processors.debug',

templates/nav.html

@@ -1,3 +1,3 @@
 <div class="container navigation">
-  SEPARATE NAV for {{ user }}
+  SEPARATE NAV for "{{ user }}" in app "{{ request.current_app }}"
 </div>