def localize_fields(cls, localized_fields):
"""
For each field name in localized_fields,
for each language in settings.LANGUAGES,
add fields to cls,
and remove the original field, instead
replace it with a DefaultFieldDescriptor,
which always returns the field in the current language.
"""
# never do this twice
if hasattr(cls, 'localized_fields'):
return cls
# MSGID_LANGUAGE is the language that is used for the gettext message id's.
# If it is not available, because the site isn't using subsites, the
# LANGUAGE_CODE is good too. MSGID_LANGUAGE gives the opportunity to
# specify a language not available in the site but which is still used for
# the message id's.
msgid_language = getattr(settings, 'MSGID_LANGUAGE',
settings.LANGUAGE_CODE)
# set the localized fields property
cls.localized_fields = localized_fields
for field in localized_fields:
original_attr = get_field_from_model_by_name(cls, field)
for cnt, language_code in enumerate(get_all_language_codes()):
i18n_attr = copy.copy(original_attr)
# add support for south introspection.
i18n_attr._south_introspects = True
i18n_attr.original_fieldname = field
i18n_attr.include_in_xml = False
lang_attr_name = get_real_fieldname(field, language_code)
i18n_attr.name = lang_attr_name
i18n_attr.creation_counter = i18n_attr.creation_counter + .01 * cnt
# null must be allowed for the message id language because this
# language might not be available at all in the backend
if not i18n_attr.null and i18n_attr.default is NOT_PROVIDED:
i18n_attr.null = True
if language_code != msgid_language:
# no validation for the fields that are language specific
if not i18n_attr.blank:
i18n_attr.blank = True
if i18n_attr.verbose_name:
i18n_attr.verbose_name = translation.string_concat(
i18n_attr.verbose_name, u' (%s)' % language_code)
cls.add_to_class(lang_attr_name, i18n_attr)
# delete original field
del cls._meta.local_fields[cls._meta.local_fields.index(original_attr)]
# copy some values and functions from the original_attr
# so the field can emulate the original_attr as good as possible
kwargs = {
'serialize':
getattr(original_attr, 'serialize', True),
'extra_attrs':
getattr(original_attr, 'extra_attrs', None),
'max_length':
getattr(original_attr, 'max_length', None),
'min_length':
getattr(original_attr, 'min_length', None),
'form_field':
original_attr.formfield(**FORMFIELD_FOR_DBFIELD_DEFAULTS.get(
original_attr.__class__, {})),
'get_internal_type':
original_attr.get_internal_type,
'unique':
getattr(original_attr, 'unique', False),
'to_python':
original_attr.to_python,
}
# copy __serialize__ if it was defined on the original attr
if hasattr(original_attr, '__serialize__'):
kwargs['__serialize__'] = original_attr.__serialize__
# add the DefaultFieldDescriptor where the original_attr was.
cls.add_to_class(field, DefaultFieldDescriptor(field, **kwargs))
# update fields cache
cls._meta._fill_fields_cache()
# return the finished product
return cls
def __restoreBlank(self, cls, blankFlags):
for field, blank in zip(self.localizedFields, blankFlags):
for code in get_all_language_codes():
i18n_attr = get_field_from_model_by_name(
cls, getLocalizedFieldName(field, code))
i18n_attr.blank = blank
def __collectBlank(self, cls):
blankFlags = []
for field in self.localizedFields:
attr = get_field_from_model_by_name(cls, field)
blankFlags.append(attr.blank)
return blankFlags
def localize_fields(cls, localized_fields):
"""
For each field name in localized_fields,
for each language in settings.LANGUAGES,
add fields to cls,
and remove the original field, instead
replace it with a DefaultFieldDescriptor,
which always returns the field in the current language.
"""
# never do this twice
if hasattr(cls, 'localized_fields'):
return cls
# MSGID_LANGUAGE is the language that is used for the gettext message id's.
# If it is not available, because the site isn't using subsites, the
# LANGUAGE_CODE is good too. MSGID_LANGUAGE gives the opportunity to
# specify a language not available in the site but which is still used for
# the message id's.
msgid_language = getattr(settings,
'MSGID_LANGUAGE', settings.LANGUAGE_CODE)
# set the localized fields property
cls.localized_fields = localized_fields
for field in localized_fields:
original_attr = get_field_from_model_by_name(cls, field)
for cnt, language_code in enumerate(get_all_language_codes()):
i18n_attr = copy.copy(original_attr)
# add support for south introspection.
i18n_attr._south_introspects = True
i18n_attr.original_fieldname = field
i18n_attr.include_in_xml = False
lang_attr_name = get_real_fieldname(field, language_code)
i18n_attr.name = lang_attr_name
i18n_attr.creation_counter = i18n_attr.creation_counter + .01 * cnt
# null must be allowed for the message id language because this
# language might not be available at all in the backend
if not i18n_attr.null and i18n_attr.default is NOT_PROVIDED:
i18n_attr.null = True
if language_code != msgid_language:
# no validation for the fields that are language specific
if not i18n_attr.blank:
i18n_attr.blank = True
if i18n_attr.verbose_name:
i18n_attr.verbose_name = translation.string_concat(
i18n_attr.verbose_name, u' (%s)' % language_code)
cls.add_to_class(lang_attr_name, i18n_attr)
# delete original field
del cls._meta.local_fields[cls._meta.local_fields.index(original_attr)]
# copy some values and functions from the original_attr
# so the field can emulate the original_attr as good as possible
kwargs = {
'serialize': getattr(original_attr, 'serialize', True),
'extra_attrs': getattr(original_attr, 'extra_attrs', None),
'max_length': getattr(original_attr, 'max_length', None),
'min_length': getattr(original_attr, 'min_length', None),
'form_field': original_attr.formfield(
**FORMFIELD_FOR_DBFIELD_DEFAULTS.get(
original_attr.__class__, {})),
'get_internal_type': original_attr.get_internal_type,
'unique': getattr(original_attr, 'unique', False),
'to_python': original_attr.to_python,
}
# copy __serialize__ if it was defined on the original attr
if hasattr(original_attr, '__serialize__'):
kwargs['__serialize__'] = original_attr.__serialize__
# add the DefaultFieldDescriptor where the original_attr was.
cls.add_to_class(field, DefaultFieldDescriptor(field, **kwargs))
# update fields cache
try:
cls._meta._fill_fields_cache()
except AttributeError:
# Django 1.8 removed _fill_fields_cache
cls._meta._expire_cache()
cls._meta._get_fields(reverse=False)
# return the finished product
return cls
def __restoreBlank(self, cls, blankFlags):
for field, blank in zip(self.localizedFields, blankFlags):
for code in get_all_language_codes():
i18n_attr = get_field_from_model_by_name(cls, getLocalizedFieldName(field, code))
i18n_attr.blank = blank
def __collectBlank(self, cls):
blankFlags = []
for field in self.localizedFields:
attr = get_field_from_model_by_name(cls, field)
blankFlags.append(attr.blank)
return blankFlags
