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django-settings-export

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Often it is needed to make some of your Django project's settings accessible from within templates. This app provides a simple mechanism for doing just that.

Principles:

  • Explicit is better than implicit: Only explicitly listed settings keys are exported to templates.
  • Errors should never pass silently: Accessing an undefined or unexported setting key from a template results in an exception.

Tested on Python 2.7+, Django 1.5+.

Installation

$ pip install django-settings-export

Add 'django_settings_export.settings_export' to template context processor list in your settings.py:

Django 1.8 and newer:

TEMPLATES = [
    {
        # …
        'OPTIONS': {
            'context_processors': [
                # …
                'django_settings_export.settings_export',
            ],
        },
    },
]

Django older than 1.8:

TEMPLATE_CONTEXT_PROCESSORS = [
    # [...]
    'django_settings_export.settings_export',
]

Usage

All settings that should be made accessible from templates need to be explicitly listed in settings.SETTINGS_EXPORT:

# settings.py

DEBUG = True
GA_ID = 'UA-00000-0'

SETTINGS_EXPORT = [
    'DEBUG',
    'GA_ID',
]

Now you can access those exported settings from your templates via settings.<KEY>:

<!-- template.html -->

{% if not settings.DEBUG %}
    <script>ga('create', '{{ settings.GA_ID }}', 'auto');</script>
{% endif %}

The settings variable is an instance of dict subclass, so you use all the methods dict provides. For example, you can iterate over the keys and values using settings.keys, settings.values, settings.items, etc:

{% for key, value in settings.items %}
    {{ key }}: {{ value }}
{% endfor %}

Changing the settings variable name

If you wish to change the name of the context variable to something besides settings, add SETTINGS_EXPORT_VARIABLE_NAME = 'custom_name' to your settings.py. This is useful when some other plugin is already adding settings to your template contexts.

# settings.py
FOO = 'bar'
SETTINGS_EXPORT = ['FOO']
SETTINGS_EXPORT_VARIABLE_NAME = 'my_config'
<!-- template.html -->

{{ my_config.FOO }}

Exceptions

These custom exceptions can be thrown:

  • Listing an undefined setting key in SETTINGS_EXPORT results in an UndefinedSettingError.
  • Accessing a unexported setting key on the settings object in a template results in an UnexportedSettingError.

All subclass from django_settings_export.SettingsExportError.

Demo & Tests

See the source code of the bundled demo app.

Development

$ cd tests

# Run demo
$ python manage.py runserver

# Run tests on current Python
$ python manage.py test

# Run tests on all Pythons
$ tox

Change Log

See CHANGELOG.

Licence

BSD. See LICENCE for more details.

Contact

Jakub Roztocil