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from __future__ import absolute_import, unicode_literals
from contextlib import contextmanager
from functools import wraps
from django.utils import translation
@contextmanager
def respect_language(language):
"""Context manager that changes the current translation language for
all code inside the following block.
Can e.g. be used inside tasks like this::
from celery import task
from djcelery.common import respect_language
@task
def my_task(language=None):
with respect_language(language):
pass
"""
if language:
prev = translation.get_language()
translation.activate(language)
try:
yield
finally:
translation.activate(prev)
else:
yield
def respects_language(fun):
"""Decorator for tasks with respect to site's current language.
You can use this decorator on your tasks together with default @task
decorator (remember that the task decorator must be applied last).
See also the with-statement alternative :func:`respect_language`.
**Example**:
.. code-block:: python
@task
@respects_language
def my_task()
# localize something.
The task will then accept a ``language`` argument that will be
used to set the language in the task, and the task can thus be
called like:
.. code-block:: python
from django.utils import translation
from myapp.tasks import my_task
# Pass the current language on to the task
my_task.delay(language=translation.get_language())
# or set the language explicitly
my_task.delay(language='no.no')
"""
@wraps(fun)
def _inner(*args, **kwargs):
with respect_language(kwargs.pop('language', None)):
return fun(*args, **kwargs)
return _inner
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