Django fails, sometimes very erratic behavior

Question

I have terrible problems with django that respond differently to the same requests for no apparent reason.

Sometimes I update, and I see an error, then update and disappear, sometimes the template complains about the missing value, and then stops again, again without explanation.

Sometimes it pulls graphics from a production server, sometimes from a development server.

Worst of all, sometimes, very often, everything looks and loads fine, but the request returns 0 hits, even hard ones, the second request based on the same request loads fine, how does the same request partially fail in one request? For this last one, I have a theory that it does not get the queryset variable from the view at all.

I am losing the search keywords for this problem, I am on the verge of porting the project to php, because at least it always does the same.

The project installs as wsgi using apache2, yes, every time I update, I am sure that the touch wsgi.pyWSGI script.

Please, help.

apache vhost config:

<VirtualHost *>
    ServerAdmin [e-mail]
    ServerName example.com
    ServerAlias www.example.com

    DocumentRoot /home/self/example.com
    <Directory />
        Options FollowSymLinks
        AllowOverride None
    </Directory>
    <Directory /home/self/example.com>
        Options Indexes FollowSymLinks MultiViews
        AllowOverride None
        Order allow,deny
        allow from all
    </Directory>

    Alias /media/ /home/self/projects/django/myapp/media/
    <Directory /home/self/projects/django/myapp/media/>
        Order deny,allow
        Allow from all
    </Directory>
    WSGIScriptAlias / /home/self/projects/django/myapp/wsgi.py
    <Directory /home/self/projects/django/myapp/>
        Order allow,deny
        Allow from all
    </Directory>
    ErrorLog /home/self/example.com/error.log
    LogLevel warn
    CustomLog /home/self/example.com/access.log combined
    ServerSignature Off
</VirtualHost>

This is wsgi.py

import os
import sys
sys.path.append('/home/self/projects/django')
sys.path.append('/home/self/projects/django/myapp')
os.environ['DJANGO_SETTINGS_MODULE'] = 'myapp.settings'

import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

And settings.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

# Django settings for myapp project.
import os
PROJECT_DIR = os.path.dirname(os.path.abspath(__file__))

DEBUG = True
TEMPLATE_DEBUG = DEBUG

ADMINS = (
    # ('My self', '[e-mail]'),
)

MANAGERS = ADMINS

DATABASE_ENGINE = 'sqlite3'                           # 'postgresql_psycopg2', 'postgresql', 'mysql', 'sqlite3' or 'oracle'.
DATABASE_NAME = os.path.join(PROJECT_DIR, 'myapp.db') # Or path to database file if using sqlite3.
DATABASE_USER = ''             # Not used with sqlite3.
DATABASE_PASSWORD = ''         # Not used with sqlite3.
DATABASE_HOST = ''             # Set to empty string for localhost. Not used with sqlite3.
DATABASE_PORT = ''             # Set to empty string for default. Not used with sqlite3.

# Local time zone for this installation. Choices can be found here:
# http://en.wikipedia.org/wiki/List_of_tz_zones_by_name
# although not all choices may be available on all operating systems.
# If running in a Windows environment this must be set to the same as your
# system time zone.
TIME_ZONE = 'America/Tegucigalpa'

# Language code for this installation. All choices can be found here:
# http://www.i18nguy.com/unicode/language-identifiers.html
# LANGUAGE_CODE = 'en-us'
LANGUAGE_CODE = 'es-es'

SITE_ID = 1

# If you set this to False, Django will make some optimizations so as not
# to load the internationalization machinery.
USE_I18N = True

# Absolute path to the directory that holds media.
# Example: "/home/media/media.lawrence.com/"
MEDIA_ROOT = ''

# URL that handles the media served from MEDIA_ROOT. Make sure to use a
# trailing slash if there is a path component (optional in other cases).
# Examples: "http://media.lawrence.com", "http://example.com/media/"
MEDIA_URL = ''

# URL prefix for admin media -- CSS, JavaScript and images. Make sure to use a
# trailing slash.
# Examples: "http://foo.com/media/", "/media/".
ADMIN_MEDIA_PREFIX = 'http://media.example.com/media/'

AUTH_PROFILE_MODULE = "myapp.userprofile"
LOGIN_URL = "/login"

# Make this unique, and don't share it with anybody.
SECRET_KEY = '1(!u3tvq^=x)y@kny&^eg&uevo6&y%k-wgl$q$-sl_0+s%3g^5'

# List of callables that know how to import templates from various sources.
TEMPLATE_LOADERS = (
    'django.template.loaders.filesystem.load_template_source',
    'django.template.loaders.app_directories.load_template_source',
#     'django.template.loaders.eggs.load_template_source',
)

MIDDLEWARE_CLASSES = (
    'django.middleware.common.CommonMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'pagination.middleware.PaginationMiddleware',
)

ROOT_URLCONF = 'myapp.urls'

TEMPLATE_DIRS = (
    os.path.join(PROJECT_DIR, 'templates'),
    # Put strings here, like "/home/html/django_templates" or "C:/www/django/templates".
    # Always use forward slashes, even on Windows.
    # Don't forget to use absolute paths, not relative paths.
)

TEMPLATE_CONTEXT_PROCESSORS = (
    "django.core.context_processors.auth",
    "django.core.context_processors.debug",
    "django.core.context_processors.i18n",
    "django.core.context_processors.media",
    "django.core.context_processors.request",
)

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'myapp',
    'pagination',
)

UPDATE:

Now I’m sure that the templates work fine and correctly update the views, which behave randomly, but with the template, sometimes they show old behaviors.

This seems like a caching problem, but I do not do any caching myself, also I always do a touch wsgi.pyscript for updating the WSGI, which is all that is needed to update the application.

Answer 1

? , .

, Django . Django.

Answer 2

, , . , , .

, KISS. , .

WSGI, . , ; .

python unittest.TestCase , python.

!:)

Answer 3

You need to show the view code if you think the problem is there. Otherwise, we can only guess what the problem is.