def add_translation_fields(model, opts):
"""
Monkey patches the original model class to provide additional fields for
every language.
Adds newly created translation fields to the given translation options.
"""
model_empty_values = getattr(opts, 'empty_values', NONE)
for field_name in opts.local_fields.keys():
field_empty_value = parse_field(model_empty_values, field_name, NONE)
for l in mt_settings.AVAILABLE_LANGUAGES:
# Create a dynamic translation field
translation_field = create_translation_field(
model=model,
field_name=field_name,
lang=l,
empty_value=field_empty_value)
# Construct the name for the localized field
localized_field_name = build_localized_fieldname(field_name, l)
# Check if the model already has a field by that name
if hasattr(model, localized_field_name):
raise ValueError(
"Error adding translation field. Model '%s' already contains a field named"
"'%s'." % (model._meta.object_name, localized_field_name))
# This approach implements the translation fields as full valid
# django model fields and therefore adds them via add_to_class
model.add_to_class(localized_field_name, translation_field)
opts.add_translation_field(field_name, translation_field)
# Rebuild information about parents fields. If there are opts.local_fields, field cache would be
# invalidated (by model._meta.add_field() function). Otherwise, we need to do it manually.
if len(opts.local_fields) == 0:
model._meta._fill_fields_cache()
def add_localized_fields(model):
"""
Monkey patchs the original model class to provide additional fields for
every language. Only do that for fields which are defined in the
translation options of the model.
Returns a dict mapping the original fieldname to a list containing the
names of the localized fields created for the original field.
"""
localized_fields = dict()
translation_opts = translator.get_options_for_model(model)
for field_name in translation_opts.fields:
localized_fields[field_name] = list()
for l in settings.LANGUAGES:
# Create a dynamic translation field
translation_field = create_translation_field(model=model,\
field_name=field_name, lang=l[0])
# Construct the name for the localized field
localized_field_name = build_localized_fieldname(field_name, l[0])
# Check if the model already has a field by that name
if hasattr(model, localized_field_name):
raise ValueError("Error adding translation field. Model '%s' "
"already contains a field named '%s'." %\
(instance.__class__.__name__,
localized_field_name))
# This approach implements the translation fields as full valid
# django model fields and therefore adds them via add_to_class
localized_field = model.add_to_class(localized_field_name,
translation_field)
localized_fields[field_name].append(localized_field_name)
return localized_fields
def add_translation_fields(model, opts):
"""
Monkey patches the original model class to provide additional fields for
every language.
Adds newly created translation fields to the given translation options.
"""
model_empty_values = getattr(opts, 'empty_values', NONE)
for field_name in opts.local_fields.keys():
field_empty_value = parse_field(model_empty_values, field_name, NONE)
for l in mt_settings.AVAILABLE_LANGUAGES:
# Create a dynamic translation field
translation_field = create_translation_field(
model=model,
field_name=field_name,
lang=l,
empty_value=field_empty_value)
# Construct the name for the localized field
localized_field_name = build_localized_fieldname(field_name, l)
# Check if the model already has a field by that name
if hasattr(model, localized_field_name):
# Check if are not dealing with abstract field inherited.
for cls in model.__mro__:
if hasattr(cls, '_meta') and cls.__dict__.get(
localized_field_name, None):
cls_opts = translator._get_options_for_model(cls)
if not cls._meta.abstract or field_name not in cls_opts.local_fields:
raise ValueError(
"Error adding translation field. Model '%s' already"
" contains a field named '%s'." %
(model._meta.object_name,
localized_field_name))
# This approach implements the translation fields as full valid
# django model fields and therefore adds them via add_to_class
model.add_to_class(localized_field_name, translation_field)
opts.add_translation_field(field_name, translation_field)
# Rebuild information about parents fields. If there are opts.local_fields, field cache would be
# invalidated (by model._meta.add_field() function). Otherwise, we need to do it manually.
if len(opts.local_fields) == 0:
try:
model._meta._fill_fields_cache()
except AttributeError:
# Django 1.8 removed _fill_fields_cache
model._meta._expire_cache()
model._meta.get_fields()
def add_translation_fields(model, opts):
"""
Monkey patches the original model class to provide additional fields for
every language.
Adds newly created translation fields to the given translation options.
"""
for field_name in opts.local_fields.keys():
for l in settings.LANGUAGES:
# Create a dynamic translation field
translation_field = create_translation_field(model=model,
field_name=field_name,
lang=l[0])
# Construct the name for the localized field
localized_field_name = build_localized_fieldname(field_name, l[0])
# Check if the model already has a field by that name
if hasattr(model, localized_field_name):
raise ValueError(
"Error adding translation field. Model '%s' already contains a field named"
"'%s'." % (model._meta.object_name, localized_field_name))
# This approach implements the translation fields as full valid
# django model fields and therefore adds them via add_to_class
model.add_to_class(localized_field_name, translation_field)
opts.add_translation_field(field_name, translation_field)