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import sqlalchemy as sa
from sqlalchemy.ext.hybrid import hybrid_property
from sqlalchemy.orm.util import has_identity
from .exc import UnknownLocaleError
from .utils import get_current_locale, get_fallback_locale
class Translatable(object):
__translatable__ = {
'fallback_locale': 'en'
}
@hybrid_property
def locale(self):
raise NotImplementedError(
'Your translatable model needs to define locale property.'
)
# Current translation getters and setters
@hybrid_property
def current_translation(self):
return self.translations[get_current_locale(self)]
@current_translation.setter
def current_translation(self, obj):
self.translations[get_current_locale(self)] = obj
@current_translation.expression
def current_translation(cls):
return cls._current_translation
# Fallback translation getters and setters
@hybrid_property
def fallback_translation(self):
return self.translations[get_fallback_locale(self)]
@fallback_translation.setter
def fallback_translation(self, obj):
self.translations[get_fallback_locale(self)] = obj
@fallback_translation.expression
def fallback_translation(cls):
return cls._fallback_translation
# Translations getters and setters
@hybrid_property
def translations(self):
if not hasattr(self, '_translations_mapping'):
self._translations_mapping = TranslationsMapping(self)
return self._translations_mapping
@translations.setter
def translations(self, translations_mapping):
self._translations = translations_mapping
@translations.expression
def translations(self):
return self._translations
@sa.event.listens_for(sa.orm.mapper, 'expire')
def receive_expire(target, attrs):
if isinstance(target, Translatable):
try:
del target._translations_mapping
except AttributeError:
pass
class TranslationsMapping(object):
def __init__(self, obj):
self.obj = obj
self.manager = self.obj.__translatable__['manager']
def __contains__(self, locale):
return locale in self.manager.option(self.obj, 'locales')
def fetch(self, locale):
session = sa.orm.object_session(self.obj)
# If the object has no identity and its not in session or if the object
# has _translations relationship loaded get the locale object from the
# relationship.
if '_translations' not in sa.inspect(self.obj).unloaded or (
not session or not has_identity(self.obj)
):
return self.obj._translations.get(locale)
return session.query(self.obj.__translatable__['class']).get(
sa.inspect(self.obj).identity + (locale, )
)
def __getitem__(self, locale):
if locale in self:
locale_obj = self.fetch(locale)
if locale_obj is not None:
return locale_obj
class_ = self.obj.__translatable__['class']
locale_obj = class_(
translation_parent=self.obj,
locale=locale
)
self.obj._translations[locale] = locale_obj
return locale_obj
raise UnknownLocaleError(locale, self.obj)
def __getattr__(self, locale):
return self.__getitem__(locale)
# Added for py2.6 compatibility
def __length_hint__(self):
return len(self)
def __len__(self):
return len(self.manager.option(self.obj, 'locales'))
@property
def all(self):
return list(self.values())
def values(self):
for locale in self.manager.option(self.obj, 'locales'):
yield self[locale]
def __setitem__(self, locale, translation_obj):
if locale in self:
translation_obj.translation_parent = self.obj
translation_obj.locale = locale
self.obj._translations[locale] = translation_obj
def __repr__(self):
return 'TranslationsMapping(%r)' % self.obj
def items(self):
return [
(locale, self[locale])
for locale in self.manager.option(self.obj, 'locales')
]
def iteritems(self):
for locale in self.manager.option(self.obj, 'locales'):
yield locale, self[locale]
def __iter__(self):
for locale in self.manager.option(self.obj, 'locales'):
yield locale, self[locale]
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