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manager.py
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manager.py
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import django
from django.core.exceptions import FieldError
from django.db import connections, models, transaction, IntegrityError
if django.VERSION >= (1, 9):
from django.db.models.query import QuerySet
else:
from django.db.models.query import QuerySet, ValuesQuerySet
from django.db.models.sql.datastructures import Join, LOUTER
from django.db.models import F, Q
from django.utils.functional import cached_property
from django.utils.translation import get_language
from hvad.compat import string_types
from hvad.query import (query_terms, q_children, expression_nodes,
add_alias_constraints)
from hvad.settings import hvad_settings
from hvad.utils import combine
from copy import deepcopy
import sys
__all__ = ('TranslationQueryset', 'TranslationManager')
#===============================================================================
class FieldTranslator(object):
"""
Translates *shared* field names from '<shared_field>' to
'master__<shared_field>' and caches those names.
"""
def __init__(self, manager):
self._manager = manager
fields = set()
for field in manager.shared_model._meta.get_fields():
fields.add(field.name)
if hasattr(field, 'attname'):
fields.add(field.attname)
fields.add('pk')
self._shared_fields = tuple(fields)
self._cache = dict()
super(FieldTranslator, self).__init__()
def __call__(self, key):
try:
ret = self._cache[key]
except KeyError:
ret = self._build(key)
self._cache[key] = ret
return ret
def _build(self, key):
"""
Checks if the selected field is a shared field
and in that case, prefixes it with master___
It also handles - and ? in case its called by
order_by()
"""
if key == "?":
return key
if key.startswith("-"):
prefix, key = "-", key[1:]
else:
prefix = ""
if key.startswith(self._shared_fields):
return '%smaster__%s' % (prefix, key)
else:
return '%s%s' % (prefix, key)
#===============================================================================
if django.VERSION >= (1, 9):
from django.db.models.query import (ModelIterable, ValuesIterable,
ValuesListIterable, FlatValuesListIterable)
class TranslatableModelIterable(ModelIterable):
def __iter__(self):
qs = self.queryset._clone()._add_language_filter()
qs._iterable_class = ModelIterable
qs._known_related_objects = {}
if qs._forced_unique_fields:
with ForcedUniqueFields(qs._forced_unique_fields):
objects = list(qs.iterator())
if type(qs.query.select_related) == dict:
for obj in objects:
qs._use_related_translations(obj, qs.query.select_related)
else:
objects = qs.iterator()
for obj in objects:
for name in qs._hvad_switch_fields:
try:
setattr(obj.master, name, getattr(obj, name))
except AttributeError: # pragma: no cover
pass
else:
delattr(obj, name)
obj = combine(obj, qs.shared_model)
# use known objects from self.queryset, not qs as we cleared it earlier
for field, rel_objs in self.queryset._known_related_objects.items():
if hasattr(obj, field.get_cache_name()):
continue # pragma: no cover (conform to Django behavior)
pk = getattr(obj, field.get_attname())
try:
rel_obj = rel_objs[pk]
except KeyError: # pragma: no cover
pass
else:
setattr(obj, field.name, rel_obj)
yield obj
class TranslatedValuesIterable(ValuesIterable):
def __iter__(self):
qs = self.queryset._clone()._add_language_filter()
qs._iterable_class = ValuesIterable
for row in qs.iterator():
yield qs._reverse_translate_fieldnames_dict(row)
class TranslatedValuesListIterable(ValuesListIterable):
def __iter__(self):
qs = self.queryset._clone()._add_language_filter()
qs._iterable_class = ValuesListIterable
return qs.iterator()
class TranslatedFlatValuesListIterable(FlatValuesListIterable):
def __iter__(self):
qs = self.queryset._clone()._add_language_filter()
qs._iterable_class = FlatValuesListIterable
return qs.iterator()
else:
class ValuesMixin(object):
_skip_master_select = True
def iterator(self):
qs = self._clone()._add_language_filter()
for row in super(ValuesMixin, qs).iterator():
if isinstance(row, dict):
yield qs._reverse_translate_fieldnames_dict(row)
else:
yield row
#===============================================================================
class ForcedUniqueFields(object):
""" Context manager that forces a set of fields to be unique while active """
def __init__(self, fields):
self.fields = fields
def __enter__(self):
for field in self.fields:
field._unique = True
def __exit__(self, *args):
for field in self.fields:
field._unique = False
#===============================================================================
# Field for language joins
#===============================================================================
class RawConstraint(object):
def __init__(self, sql, aliases):
self.sql = sql
self.aliases = aliases
def as_sql(self, compiler, connection):
aliases = tuple(compiler.quote_name_unless_alias(alias) for alias in self.aliases)
return (self.sql % aliases, [])
class BetterTranslationsField(object):
def __init__(self, translation_fallbacks, master):
# Filter out duplicates, while preserving order
self._fallbacks = []
self._master = master
seen = set()
for lang in translation_fallbacks:
if lang not in seen:
seen.add(lang)
self._fallbacks.append(lang)
def get_extra_restriction(self, where_class, alias, related_alias):
langcase = ('(CASE %s.language_code ' +
' '.join('WHEN \'%s\' THEN %d' % (lang, i)
for i, lang in enumerate(self._fallbacks)) +
' ELSE %d END)' % len(self._fallbacks))
return RawConstraint(
sql=' '.join((langcase, '<', langcase, 'OR ('
'%s.language_code = %s.language_code AND '
'%s.id < %s.id)')),
aliases=(alias, related_alias,
alias, related_alias,
alias, related_alias)
)
def get_joining_columns(self):
return ((self._master, self._master), )
#===============================================================================
# TranslationQueryset
#===============================================================================
class TranslationQueryset(QuerySet):
"""
This is where things happen.
To fully understand this project, you have to understand this class.
Go through each method individually, maybe start with 'get', 'create' and
'iterator'.
IMPORTANT: the `model` attribute on this class is the *translated* Model,
despite this being used as the queryset for the *shared* Model!
"""
override_classes = {}
if django.VERSION < (1, 9):
override_classes[ValuesQuerySet] = ValuesMixin
_skip_master_select = False
def __init__(self, *args, **kwargs):
# model can be either first positional, or a named arg
if len(args) >= 1:
model, args = args[0], args[1:]
else:
model = kwargs.pop('model', None)
if model is not None: # check the given model is correct
if hasattr(model._meta, 'translations_model'):
# normal creation gets a shared model that we must flip around
model, self.shared_model = model._meta.translations_model, model
elif not hasattr(model._meta, 'shared_model'):
raise TypeError('TranslationQueryset only works on translatable models')
self._local_field_names = None
self._field_translator = None
self._language_code = None
self._language_fallbacks = None
self._raw_select_related = []
self._forced_unique_fields = [] # Used for select_related
self._language_filter_tag = False
self._hvad_switch_fields = ()
super(TranslationQueryset, self).__init__(model, *args, **kwargs)
if django.VERSION >= (1, 9):
self._iterable_class = TranslatableModelIterable
#===========================================================================
# Helpers and properties (INTERNAL!)
#===========================================================================
def _clone(self, klass=None, setup=False, **kwargs):
""" Creates a clone of this queryset - Django equivalent of copy()
This method keeps all defining attributes and drops data caches
"""
kwargs.update({
'shared_model': self.shared_model,
'_local_field_names': self._local_field_names,
'_field_translator': self._field_translator,
'_language_code': self._language_code,
'_language_fallbacks': self._language_fallbacks,
'_raw_select_related': self._raw_select_related,
'_forced_unique_fields': list(self._forced_unique_fields),
'_language_filter_tag': getattr(self, '_language_filter_tag', False),
'_hvad_switch_fields': self._hvad_switch_fields,
})
if django.VERSION < (1, 9):
kwargs.update({
'klass': None if klass is None else self._get_class(klass),
'setup': setup,
})
return super(TranslationQueryset, self)._clone(**kwargs)
@property
def field_translator(self):
if self._field_translator is None:
self._field_translator = FieldTranslator(self)
return self._field_translator
@property
def shared_local_field_names(self):
if self._local_field_names is None:
fields = set()
for field in self.shared_model._meta.get_fields():
fields.add(field.name)
if hasattr(field, 'attname'):
fields.add(field.attname)
self._local_field_names = tuple(fields)
return self._local_field_names
def _translate_args_kwargs(self, *args, **kwargs):
# Translate args (Q objects) from '<shared_field>' to
# 'master__<shared_field>' where necessary.
newargs = deepcopy(args)
for q in newargs:
for child, children, index in q_children(q):
children[index] = (self.field_translator(child[0]), child[1])
# Translated kwargs from '<shared_field>' to 'master__<shared_field>'
# where necessary.
newkwargs = dict((self.field_translator(key), value)
for key, value in kwargs.items())
return newargs, newkwargs
def _translate_expression(self, expr):
if isinstance(expr, string_types):
return self.field_translator(expr)
for node in expression_nodes(expr):
if isinstance(node, F):
node.name = self.field_translator(node.name)
elif hasattr(node, 'lookup'):
node.lookup = self.field_translator(node.lookup)
return expr
def _translate_fieldnames(self, fieldnames):
return [name if name in self.query.annotations
else self.field_translator(name)
for name in fieldnames]
def _reverse_translate_fieldnames_dict(self, fieldname_dict):
"""
Helper function to make sure the user doesnt get "bothered"
with the construction of shared/translated model
Translates e.g.
{'master__number_avg': 10} to {'number__avg': 10}
"""
prefix = 'master__'
return dict(
(key[len(prefix):] if key.startswith(prefix) else key, value)
for key, value in fieldname_dict.items()
)
def _split_kwargs(self, **kwargs):
"""
Split kwargs into shared and translated fields
"""
shared = {}
translated = {}
for key, value in kwargs.items():
if key in self.shared_local_field_names:
shared[key] = value
else:
translated[key] = value
return shared, translated
def _get_class(self, klass):
# remove whole method when we drop support for Django 1.8
for key, value in self.override_classes.items():
if issubclass(klass, key):
return type(value.__name__, (value, klass, TranslationQueryset,), {})
else: # pragma: no cover
return klass
def _get_shared_queryset(self):
qs = super(TranslationQueryset, self)._clone()
qs.__class__ = QuerySet
accessor = self.shared_model._meta.translations_accessor
# update using the real manager
return QuerySet(self.shared_model, using=self.db).filter(**{'%s__in' % accessor: qs})
def _add_select_related(self, language_code):
fields = self._raw_select_related
related_queries = []
language_filters = []
force_unique_fields = []
if not self._skip_master_select and getattr(self, '_fields', None) is None:
related_queries.append('master')
for query_key in fields:
newbits = []
for term in query_terms(self.shared_model, query_key):
# Translate term
if term.depth == 0 and not term.translated:
# on initial depth we must key to shared model
newbits.append('master__%s' % term.term)
elif term.depth > 0 and term.translated:
# on deeper levels we must key to translations model
# this will work because translations will be seen as _unique
# at query time
newbits.append('%s__%s' % (term.model._meta.translations_accessor, term.term))
else:
newbits.append(term.term)
# Some helpful messages for common mistakes
if term.many:
raise FieldError('Cannot select_related: %s can be multiple objects. '
'Use prefetch_related instead.' % query_key)
if term.target is None:
raise FieldError('Cannot select_related: %s is a regular field' % query_key)
if hasattr(term.field.rel, 'through'):
raise FieldError('Cannot select_related: %s can be multiple objects. '
'Use prefetch_related instead.' % query_key)
# If target is a translated model, select its translations
target_translations = getattr(term.target._meta, 'translations_accessor', None)
if target_translations is not None:
# Add the model
target_query = '__'.join(newbits)
related_queries.append('%s__%s' % (target_query, target_translations))
# Add a language filter for the translation
language_filters.append('%s__%s__language_code' % (
target_query,
target_translations,
))
# Remember to mark the field unique so JOIN is generated
# and row decoder gets cached items
if django.VERSION >= (1, 9):
target_transfield = getattr(term.target, target_translations).field
else:
target_transfield = getattr(term.target, target_translations).related.field
force_unique_fields.append(target_transfield)
related_queries.append('__'.join(newbits))
# Apply results to query
self.query.add_select_related(related_queries)
for language_filter in language_filters:
self.query.add_q(Q(**{language_filter: language_code}) |
Q(**{language_filter: None}))
self._forced_unique_fields = force_unique_fields
def _add_language_filter(self):
if self._language_filter_tag: # pragma: no cover
raise RuntimeError('Queryset is already tagged. This is a bug in hvad')
self._language_filter_tag = True
if self._language_code == 'all':
self._add_select_related(F('language_code'))
elif self._language_fallbacks:
if self._raw_select_related:
raise NotImplementedError('Using select_related along with '
'fallbacks() is not supported')
languages = tuple(get_language() if lang is None else lang
for lang in (self._language_code,) + self._language_fallbacks)
masteratt = self.model._meta.get_field('master').attname
alias = self.query.join(Join(
self.model._meta.db_table,
self.query.get_initial_alias(),
None,
LOUTER,
BetterTranslationsField(languages, master=masteratt),
True
))
add_alias_constraints(self, (self.model, alias), id__isnull=True)
self.query.add_filter(('%s__isnull' % masteratt, False))
if not self._skip_master_select and getattr(self, '_fields', None) is None:
self.query.add_select_related(('master',))
else:
language_code = self._language_code or get_language()
self.query.add_filter(('language_code', language_code))
self._add_select_related(language_code)
# if queryset is about to use the model's default ordering, we
# override that now with a translated version of the model's ordering
if self.query.default_ordering and not self.query.order_by:
ordering = self.shared_model._meta.ordering
self.query.order_by = self._translate_fieldnames(ordering or [])
return self
def _use_related_translations(self, obj, relations_dict, depth=0):
"""
Ensure that we use cached translations brought in via select_related if
available. Necessary since the database select_related query caches the
related translation models in a different place than hvad expects it.
"""
# First, set translation for current object,
accessor = getattr(obj._meta, 'translations_accessor', None)
if accessor is not None:
if django.VERSION >= (1, 9):
cache = getattr(obj.__class__, accessor).rel.get_cache_name()
else:
cache = getattr(obj.__class__, accessor).related.get_cache_name()
try:
translation = getattr(obj, cache)
except AttributeError:
pass
else:
delattr(obj, cache)
setattr(obj, obj._meta.translations_cache, translation)
# Then recurse in the relation dict
for field, sub_dict in relations_dict.items():
target = translation if field == accessor else getattr(obj, field)
if target is not None:
self._use_related_translations(target, sub_dict, depth+1)
#===========================================================================
# Queryset/Manager API
#===========================================================================
def language(self, language_code=None):
self._language_code = language_code
return self
def fallbacks(self, *fallbacks):
if not fallbacks:
self._language_fallbacks = hvad_settings.FALLBACK_LANGUAGES
elif fallbacks == (None,):
self._language_fallbacks = None
else:
self._language_fallbacks = fallbacks
return self
#===========================================================================
# Queryset/Manager API that do database queries
#===========================================================================
if django.VERSION < (1, 9):
def iterator(self):
qs = self._clone()._add_language_filter()
qs._known_related_objects = {} # super's iterator will attempt to set them
if qs._forced_unique_fields:
with ForcedUniqueFields(qs._forced_unique_fields):
objects = list(super(TranslationQueryset, qs).iterator())
if type(qs.query.select_related) == dict:
for obj in objects:
qs._use_related_translations(obj, qs.query.select_related)
else:
objects = super(TranslationQueryset, qs).iterator()
for obj in objects:
for name in self._hvad_switch_fields:
try:
setattr(obj.master, name, getattr(obj, name))
except AttributeError: # pragma: no cover
pass
else:
delattr(obj, name)
obj = combine(obj, qs.shared_model)
# use known objects from self, not qs as we cleared it earlier
for field, rel_objs in self._known_related_objects.items():
if hasattr(obj, field.get_cache_name()):
# should not happen, but we conform to Django behavior
continue #pragma: no cover
pk = getattr(obj, field.get_attname())
try:
rel_obj = rel_objs[pk]
except KeyError: #pragma: no cover
pass
else:
setattr(obj, field.name, rel_obj)
yield obj
def create(self, **kwargs):
if 'language_code' not in kwargs:
kwargs['language_code'] = self._language_code or get_language()
elif self._language_code is not None:
raise ValueError('Overriding language_code in create() is not allowed. '
'Please set the language with language() instead.')
if kwargs['language_code'] == 'all':
raise ValueError('Cannot create an object with language \'all\'')
obj = self.shared_model(**kwargs)
self._for_write = True
obj.save(force_insert=True, using=self.db)
return obj
def count(self):
if self._result_cache is None:
qs = self._clone()._add_language_filter()
return super(TranslationQueryset, qs).count()
else:
return len(self._result_cache)
def exists(self):
if self._result_cache is None:
qs = self._clone()._add_language_filter()
return super(TranslationQueryset, qs).exists()
else:
return bool(self._result_cache)
def get_or_create(self, **kwargs):
"""
Looks up an object with the given kwargs, creating one if necessary.
Returns a tuple of (object, created), where created is a boolean
specifying whether an object was created.
"""
assert kwargs, \
'get_or_create() must be passed at least one keyword argument'
defaults = kwargs.pop('defaults', {})
lookup = kwargs.copy()
for f in self.model._meta.fields:
if f.attname in lookup:
lookup[f.name] = lookup.pop(f.attname)
try:
self._for_write = True
return self.get(**lookup), False
except self.model.DoesNotExist:
pass
params = dict([(k, v) for k, v in kwargs.items() if '__' not in k])
params.update(defaults)
if 'language_code' not in params:
params['language_code'] = self._language_code or get_language()
elif self._language_code is not None:
raise ValueError('Overriding language_code in get_or_create() is not allowed. '
'Please set the language with language() instead.')
if params['language_code'] == 'all':
raise ValueError('Cannot create an object with language \'all\'')
obj = self.shared_model(**params)
try:
with transaction.atomic(using=self.db):
obj.save(force_insert=True, using=self.db)
return obj, True
except IntegrityError:
exc_info = sys.exc_info()
try:
return self.get(**lookup), False
except self.model.DoesNotExist:
raise exc_info[1]
def update_or_create(self, defaults=None, **kwargs):
raise NotImplementedError()
def bulk_create(self, objs, batch_size=None):
raise NotImplementedError()
def aggregate(self, *args, **kwargs):
"""
Loops over all the passed aggregates and translates the fieldnames
"""
qs = self._clone()._add_language_filter()
newargs = tuple(qs._translate_expression(item) for item in args)
newkwargs = dict(
(k, qs._translate_expression(v)) for k, v in kwargs.items()
)
response = super(TranslationQueryset, qs).aggregate(*newargs, **newkwargs)
return qs._reverse_translate_fieldnames_dict(response)
def latest(self, field_name=None):
field_name = self.field_translator(field_name or self.shared_model._meta.get_latest_by)
return super(TranslationQueryset, self).latest(field_name)
def earliest(self, field_name=None):
field_name = self.field_translator(field_name or self.shared_model._meta.get_latest_by)
return super(TranslationQueryset, self).earliest(field_name)
def in_bulk(self, id_list):
if not id_list:
return {}
if self._language_code == 'all':
raise ValueError('Cannot use in_bulk along with language(\'all\').')
qs = self.filter(pk__in=id_list)
qs.query.clear_ordering(force_empty=True)
return dict((obj._get_pk_val(), obj) for obj in qs.iterator())
def delete(self):
qs = self._get_shared_queryset()
qs.delete()
delete.alters_data = True
delete.queryset_only = True
def delete_translations(self):
qs = self._clone()._add_language_filter()
if connections[self._db].features.update_can_self_select:
super(TranslationQueryset, qs).delete()
else:
with transaction.atomic(using=self._db, savepoint=False):
qs = (super(TranslationQueryset, qs) if django.VERSION >= (1, 9) else
super(TranslationQueryset, self))
pks = list(qs.values_list('pk', flat=True))
self.model._base_manager.filter(pk__in=pks).delete()
delete_translations.alters_data = True
def update(self, **kwargs):
qs = self._clone()._add_language_filter()
shared, translated = qs._split_kwargs(**kwargs)
count = 0
if translated:
count += super(TranslationQueryset, qs).update(**translated)
if shared:
shared_qs = qs._get_shared_queryset()
count += shared_qs.update(**shared)
return count
update.alters_data = True
#===========================================================================
# Queryset/Manager API that return another queryset
#===========================================================================
def filter(self, *args, **kwargs):
if 'language_code' in kwargs and kwargs['language_code'] == 'all':
raise ValueError('Value "all" is invalid for language_code')
newargs, newkwargs = self._translate_args_kwargs(*args, **kwargs)
return super(TranslationQueryset, self).filter(*newargs, **newkwargs)
def exclude(self, *args, **kwargs):
if 'language_code' in kwargs and kwargs['language_code'] == 'all':
raise ValueError('Value "all" is invalid for language_code')
newargs, newkwargs = self._translate_args_kwargs(*args, **kwargs)
return super(TranslationQueryset, self).exclude(*newargs, **newkwargs)
def extra(self, select=None, where=None, params=None, tables=None,
order_by=None, select_params=None):
qs = super(TranslationQueryset, self).extra(select, where, params, tables,
order_by, select_params)
if select:
switch_fields = set(self._hvad_switch_fields)
switch_fields.update(select.keys())
qs._hvad_switch_fields = tuple(switch_fields)
return qs
def values(self, *fields):
fields = self._translate_fieldnames(fields)
qs = super(TranslationQueryset, self).values(*fields)
if django.VERSION >= (1, 9):
qs._iterable_class = TranslatedValuesIterable
return qs
def values_list(self, *fields, **kwargs):
fields = self._translate_fieldnames(fields)
qs = super(TranslationQueryset, self).values_list(*fields, **kwargs)
if django.VERSION >= (1, 9):
qs._iterable_class = (TranslatedFlatValuesListIterable
if qs._iterable_class is FlatValuesListIterable else
TranslatedValuesListIterable)
return qs
def select_related(self, *fields):
if not fields:
raise NotImplementedError('To use select_related on a translated model, '
'you must provide a list of fields.')
if fields == (None,):
self._raw_select_related = []
else:
self._raw_select_related.extend(fields)
return self
def complex_filter(self, filter_obj):
# Don't know how to handle Q object yet, but it is probably doable...
# An unknown type object that supports 'add_to_query' is a different story :)
if isinstance(filter_obj, models.Q) or hasattr(filter_obj, 'add_to_query'):
raise NotImplementedError()
newargs, newkwargs = self._translate_args_kwargs(**filter_obj)
return super(TranslationQueryset, self)._filter_or_exclude(None, *newargs, **newkwargs)
def annotate(self, *args, **kwargs):
newkwargs = dict((k, self._translate_expression(v)) for k, v in kwargs.items())
for arg in args:
arg = self._translate_expression(arg)
try:
alias = arg.default_alias
except (AttributeError, TypeError):
raise TypeError("Complex annotations require an alias")
if alias.startswith('master__'):
alias = alias[8:]
if alias in kwargs:
raise ValueError("The named annotation '%s' conflicts with the "
"default name for another annotation." % alias)
newkwargs[alias] = arg
qs = super(TranslationQueryset, self).annotate(**newkwargs)
switch_fields = set(qs._hvad_switch_fields)
switch_fields.update(newkwargs)
qs._hvad_switch_fields = tuple(switch_fields)
return qs
def order_by(self, *field_names):
fieldnames = self._translate_fieldnames(field_names)
return super(TranslationQueryset, self).order_by(*fieldnames)
def reverse(self):
return super(TranslationQueryset, self).reverse()
def defer(self, *field_names):
if field_names == (None,):
fieldnames = field_names
else:
fieldnames = self._translate_fieldnames(field_names)
return super(TranslationQueryset, self).defer(*fieldnames)
def only(self, *field_names):
fieldnames = self._translate_fieldnames(field_names)
fieldnames += ('master__%s' % self.shared_model._meta.pk.name, 'master_id', 'language_code')
return super(TranslationQueryset, self).only(*fieldnames)
#===============================================================================
# TranslationManager
#===============================================================================
class TranslationManager(models.Manager):
"""
Manager class for models with translated fields
"""
#===========================================================================
# API
#===========================================================================
use_for_related_fields = True
silence_use_for_related_fields_deprecation = True # Django 1.10
queryset_class = TranslationQueryset
fallback_class = QuerySet
default_class = TranslationQueryset if hvad_settings.USE_DEFAULT_QUERYSET else QuerySet
def __init__(self, *args, **kwargs):
self.queryset_class = kwargs.pop('queryset_class', self.queryset_class)
self.fallback_class = kwargs.pop('fallback_class', self.fallback_class)
self.default_class = kwargs.pop('default_class', self.default_class)
super(TranslationManager, self).__init__(*args, **kwargs)
def _make_queryset(self, klass, core_filters):
''' Builds a queryset of given class.
core_filters tells whether the queryset will bypass RelatedManager
mechanics and therefore needs to reapply the filters on its own.
'''
qs = klass(self.model, using=self.db, hints=self._hints)
core_filters = getattr(self, 'core_filters', None) if core_filters else None
if core_filters:
qs = qs._next_is_sticky().filter(**core_filters)
return qs
def language(self, language_code=None):
return self._make_queryset(self.queryset_class, True).language(language_code)
def untranslated(self):
return self._make_queryset(self.fallback_class, True)
def get_queryset(self):
return self._make_queryset(self.default_class, False)
#===========================================================================
# Internals
#===========================================================================
@cached_property
def translations_model(self):
return self.model._meta.translations_model
#===============================================================================
# TranslationAware
#===============================================================================
class TranslationAwareQueryset(QuerySet):
def __init__(self, *args, **kwargs):
super(TranslationAwareQueryset, self).__init__(*args, **kwargs)
self._language_code = None
def _translate(self, key, model, language_joins):
''' Translate a key on a model.
language_joins must be a set that will be updated with required
language joins for given key
'''
newkey = []
for term in query_terms(model, key):
if term.translated:
newkey.append('%s__%s' % (term.model._meta.translations_accessor, term.term))
else:
newkey.append(term.term)
if term.target is not None:
taccessor = getattr(term.target._meta, 'translations_accessor', None)
if taccessor is not None:
language_joins.add('__'.join(newkey + [taccessor, 'language_code']))
return '__'.join(newkey)
def _translate_args_kwargs(self, *args, **kwargs):
self.language(self._language_code)
language_joins = set()
extra_filters = Q()
newkwargs = dict(
(self._translate(key, self.model, language_joins), value)
for key, value in kwargs.items()
)
newargs = deepcopy(args)
for q in newargs:
for child, children, index in q_children(q):
children[index] = (self._translate(child[0], self.model, language_joins),
child[1])
for langjoin in language_joins:
extra_filters &= Q(**{langjoin: self._language_code})
return newargs, newkwargs, extra_filters
def _translate_fieldnames(self, fields):
self.language(self._language_code)
extra_filters = Q()
language_joins = set()
newfields = tuple(
self._translate(field, self.model, language_joins)
for field in fields
)
for langjoin in language_joins:
extra_filters &= Q(**{langjoin: self._language_code})
return newfields, extra_filters
#===========================================================================
# Queryset/Manager API
#===========================================================================
def language(self, language_code=None):
if not language_code:
language_code = get_language()
self._language_code = language_code
return self
def get(self, *args, **kwargs):
newargs, newkwargs, extra_filters = self._translate_args_kwargs(*args, **kwargs)
return self._filter_extra(extra_filters).get(*newargs, **newkwargs)
def filter(self, *args, **kwargs):
newargs, newkwargs, extra_filters = self._translate_args_kwargs(*args, **kwargs)
return self._filter_extra(extra_filters).filter(*newargs, **newkwargs)
def aggregate(self, *args, **kwargs):
raise NotImplementedError()
def latest(self, field_name=None):
extra = Q()
if field_name:
language_joins, lang = set(), self._language_code or get_language()
field_name = self._translate(field_name, self.model, language_joins)
for join in language_joins:
extra &= Q(**{join: lang})
return self._filter_extra(extra).latest(field_name)
def earliest(self, field_name=None):
extra = Q()
if field_name:
language_joins, lang = set(), self._language_code or get_language()
field_name = self._translate(field_name, self.model, language_joins)
for join in language_joins:
extra &= Q(**{join: lang})
return self._filter_extra(extra).earliest(field_name)
def in_bulk(self, id_list):
if not id_list:
return {}
qs = self.filter(pk__in=id_list)
qs.query.clear_ordering(force_empty=True)
return dict((obj._get_pk_val(), obj) for obj in qs.iterator())
def values(self, *fields):
fields, extra_filters = self._translate_fieldnames(fields)
return self._filter_extra(extra_filters).values(*fields)
def values_list(self, *fields, **kwargs):
fields, extra_filters = self._translate_fieldnames(fields)
return self._filter_extra(extra_filters).values_list(*fields, **kwargs)
def dates(self, field_name, kind, order='ASC'):
raise NotImplementedError()
def datetimes(self, field, *args, **kwargs):
raise NotImplementedError()
def exclude(self, *args, **kwargs):
newargs, newkwargs, extra_filters = self._translate_args_kwargs(*args, **kwargs)
if extra_filters.children:
combined = extra_filters & ~Q(*args, **kwargs)
return super(TranslationAwareQueryset, self).filter(combined)
else:
return super(TranslationAwareQueryset, self).exclude(*newargs, **newkwargs)
def complex_filter(self, filter_obj):
# admin calls this with an empy filter_obj sometimes
if filter_obj == {}:
return self
raise NotImplementedError()
def annotate(self, *args, **kwargs):
raise NotImplementedError()
def order_by(self, *field_names):
"""
Returns a new QuerySet instance with the ordering changed.
"""
fieldnames, extra_filters = self._translate_fieldnames(field_names)
return self._filter_extra(extra_filters).order_by(*fieldnames)
def reverse(self):
raise NotImplementedError()
def defer(self, *fields):
raise NotImplementedError()
def only(self, *fields):
raise NotImplementedError()
def _clone(self, klass=None, setup=False, **kwargs):
kwargs.update({
'_language_code': self._language_code,
})
if django.VERSION < (1, 9):
kwargs.update({'klass': klass, 'setup': setup})
return super(TranslationAwareQueryset, self)._clone(**kwargs)
def _filter_extra(self, extra_filters):
if extra_filters.children:
qs = self._next_is_sticky()
qs = super(TranslationAwareQueryset, qs).filter(extra_filters)