mirror of
https://github.com/Hopiu/django-modeltranslation.git
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74 lines
2.7 KiB
Python
74 lines
2.7 KiB
Python
# -*- coding: utf-8 -*-
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from django.db import models
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from django.conf import settings
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from django.core.exceptions import ValidationError
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from django.contrib.contenttypes.models import ContentType
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from django.utils.translation import get_language as _get_language
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from django.utils.functional import lazy
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def get_language():
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"""
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Return an active language code that is guaranteed to be in
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settings.LANGUAGES (Django does not seem to guarantee this for us.)
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"""
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lang = _get_language()
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available_languages = [l[0] for l in settings.LANGUAGES]
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if lang not in available_languages and '-' in lang:
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lang = lang.split('-')[0]
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if lang in available_languages:
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return lang
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return available_languages[0]
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def get_translation_fields(field):
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"""Returns a list of localized fieldnames for a given field."""
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return [build_localized_fieldname(field, l[0]) for l in settings.LANGUAGES]
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def build_localized_fieldname(field_name, lang):
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return '%s_%s' % (field_name, lang.replace('-', '_'))
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def _build_localized_verbose_name(verbose_name, lang):
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return u'%s [%s]' % (verbose_name, lang)
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build_localized_verbose_name = lazy(_build_localized_verbose_name, unicode)
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class TranslationFieldDescriptor(object):
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"""A descriptor used for the original translated field."""
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def __init__(self, name, initial_val=""):
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"""
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The ``name`` is the name of the field (which is not available in the
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descriptor by default - this is Python behaviour).
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"""
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self.name = name
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self.val = initial_val
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def __set__(self, instance, value):
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lang = get_language()
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loc_field_name = build_localized_fieldname(self.name, lang)
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# also update the translation field of the current language
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setattr(instance, loc_field_name, value)
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# update the original field via the __dict__ to prevent calling the
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# descriptor
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instance.__dict__[self.name] = value
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def __get__(self, instance, owner):
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if not instance:
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raise ValueError(u"Translation field '%s' can only be "
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"accessed via an instance not via "
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"a class." % self.name)
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lang = get_language()
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loc_field_name = build_localized_fieldname(self.name, lang)
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if hasattr(instance, loc_field_name):
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return getattr(instance, loc_field_name) or \
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instance.__dict__[self.name]
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#return instance.__dict__[self.name]
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# FIXME: KeyError raised for ForeignKeyTanslationField
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# in admin list view
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try:
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return instance.__dict__[self.name]
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except KeyError:
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return None
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