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Some essential tools when working with any Django project

Project Description

Few essential additions for working with Django web framework. In other words, stuff I have always copied to every project I have been working with.

Setting management

Module conf contains tools to hwlp working with django settings.py. Most important parts are including local_settings.py and creating SECRET_KEY in secret_key.py. In addition, environment variables starting with DJANGO_ will be included (parsed as json) to overwrite settings (useful for heroku for example).

In end of your settings.py add following:

from r_django_essentials.conf import update_settings
update_settings(__name__)

That is basically same as:

from r_django_essentials.conf import *

# second argument is optional for all except firts. Default is shown here.
update_settings_from_module(__name__, 'local_settings')
update_secret_from_file(__name__, 'secret_key')
update_settings_from_environment(__name__, 'DJANGO_')
update_installed_apps(__name__, 'required_apps')
update_context_processors_from_apps(__name__, 'context_processors')
use_cache_template_loader_in_production(__name__)

Consult the conf.py for more details.

Secret key autogeneration

Every installation of your application should always use it’s own randomly generated SECRET_KEY. To help with this task you can use this feature to automatically create new key if one is not provided by the settings.

For this feature to work, your settings.py needs to do one of the following:

# Include SECRET_KEY from secret_key.py into settings
from r_django_essentials.conf import update_secret_from_file
update_secret_from_file(__name__, 'secret_key')
# update_settings will call above function as part of it's work
from r_django_essentials.conf import update_settings
update_settings(__name__)

This will load the option if the file exists and will create new file if one doesn’t exist.

Remember to add myproject/secret_key.py to .gitignore as you shouldn’t ever have SECRET_KEY in your version control.

Django app dependencies

Django doesn’t support depending from another Django app, but that is still sometimes really useful. To keep power for the web app maintainer, don’t abuse this system my including complex django apps. This feature is best used to include template and asset libraries (distributed ass django apps).

For this feature to work, your settings.py needs to do one of the following:

# Just expand the apps dependencies
from r_django_essentials.conf import expand_required_apps
INSTALLED_APPS = expand_required_apps(INSTALLED_APPS)
# Do same as above, but manipulate settings module
from r_django_essentials.conf import update_installed_apps
update_installed_apps(__name__)
# update_settings will call above function as part of it's work
from r_django_essentials.conf import update_settings
update_settings(__name__)

Now that settings.py is calling correct functions, you need to add something like following to your apps AppConfig:

# myapp/apps.py
from django.apps import AppConfig

class MyAppConfig(AppConfig):
    name = 'myapp'
    verbose_name = 'My example app'

    required_apps = [
        'django.contrib.staticfiles',
        'django.contrib.humanize',
    ]

Those apps will be added to INSTALLED_APPS by one of the above settings snippets.

Required context processors

Similar to app dependencies, this feature populates template engines context_processors list from AppConfig.

For this feature to work, your settings.py needs to do one of the following:

# Just update TEMPLATES list of dictionaries
from r_django_essentials.conf import add_required_context_processors
add_required_context_processors(TEMPLATES, INSTALLED_APPS)
# Do same as above, but manipulate settings module
from r_django_essentials.conf import update_context_processors_from_apps
update_context_processors_from_apps(__name__)
# update_settings will call above function as part of it's work
from r_django_essentials.conf import update_settings
update_settings(__name__)

In your apps AppConfig you would have something like this:

# myapp/apps.py
from django.apps import AppConfig

class MyAppConfig(AppConfig):
    name = 'myapp'
    verbose_name = 'My example app'

    context_processors = 'myapp.context_processors.myapp_context_processor'
    # or
    context_processors = (
        'myapp.context_processors.myapp_context_processor1',
        'myapp.context_processors.myapp_context_processor2',
    )

Above will add context processors into django template engines options. If you need to add context processors for different backend, then use dictionary with backend as a key and list of processors as value.

Deprecated warning

Need to mark function deprecated without good deprecation system in place?

from r_django_essentials.deprecation import deprecated

@deprecated("my_function is deprecated, use my_new_function instead")
def my_function(argument):
    return my_new_function(argument)

Colorized log formatter

You would like to color code different log sources with different colors?

In your settings.py:

OGGING = {
  'version': 1,
  'disable_existing_loggers': False,
  'formatters': {
    'colored': {
      '()': 'r_django_essentials.logging.SourceColorizeFormatter',
      'format': '[%(asctime)s: %(levelname)8s %(name)s] %(message)s',
      'colors': {
        'django.db.backends': {'fg': 'cyan'},
        'myapp': {'fg': 'red'},
      },
    },
  },
  'handlers': {
    'debug_console': {
      'level': 'DEBUG',
      'class': 'logging.StreamHandler',
      'stream': 'ext://sys.stdout',
      'formatter': 'colored',
    },
  },
  'loggers': {
    '': {
      'level': 'DEBUG',
      'handlers': ['debug_console'],
      'propagate': True
    },
  },
}

Enum for choices in models

Easily create enumerations that works well with choices field in django.

In your models.py:

from django.db import models
from django.utils.translation import ugettext_lazy as _
from r_django_essentials.fields import Enum

class MyProcess(models.Model):
    STATUS = Enum(
        ('OK', 0, _('Process is ok')),
        ('PROBLEM', 1, _('Process has problem')),
        ('ERROR', 2, _('Process is in error state')),
    )

    status = models.PositiveSmallIntegerField(
        default=STATUS.OK,
        choices=STATUS.choices,
        verbose_name=_("Process status"),
    )

    @property
    def status_text(self):
        return self.STATUS[self.status]
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1.0.0

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