http://snippets.dzone.com/posts Thu, 28 Aug 2008 13:09:17 GMT DZone Snippets: Fdb's Code Snippets http://snippets.dzone.com/posts/show/2979 The approach taken here gives each object (in this case a wiki Page) a language and a translation_of field. These two fields can be added to any model that wants to add content translations. <br /> <br />Pages are created in a default language. To translate a page, you create a new page and set the translation_of field to the page in the default language that you are translating. <br /> <br />A set of helper methods allow you to get the root version of the page (in the default language), all translations of a page, or a specific translation. These are useful for adding translation links. <br /> <br /><code> <br />LANGUAGE_CHOICES = ( <br /> ('en', 'English'), <br /> ('nl', 'Nederlands') <br />) <br /> <br />class Page(models.Model): <br /> language = models.CharField(maxlength=2, choices=LANGUAGE_CHOICES) <br /> title = models.CharField(maxlength=60) <br /> path = models.SlugField(prepopulate_from=('title',)) <br /> translation_of = models.ForeignKey('self', related_name='translation_set', limit_choices_to = {'language' : settings.DEFAULT_LANGUAGE}, blank=True, null=True, help_text="Select which page this is a translation of. Don't set this for english pages.", validator_list = [local_models.validate_translation_of]) <br /> content = models.TextField(blank=True) <br /> <br /> def get_root_translation(self): <br /> """Returns the root translation for this page. <br /> <br /> This page will be in the settings.DEFAULT_LANGUAGE.""" <br /> if self.translation_of is None: <br /> return self <br /> else: <br /> return self.translation_of <br /> <br /> def get_translations(self): <br /> """Return all of the translations for this page.""" <br /> # If I am the root translation, just return all of my translations. <br /> if self.translation_of is None: <br /> return self.translation_set.all() <br /> else: <br /> # If I am not the root, return the root translations, plus all of its <br /> # translations, minus myself. <br /> return Page.objects.filter( <br /> models.Q(id=self.translation_of.id) | <br /> models.Q(translation_of=self.translation_of.id)).exclude(pk=self.id) <br /> <br /> def get_translation(self, language): <br /> """Return a specific translation of this page.""" <br /> if self.language == language: <br /> return self <br /> # If I am the root translation, search for translations of me in the given language <br /> elif self.translation_of is None: <br /> try: <br /> return Page.objects.get(translation_of=self.id, language=language) <br /> except Page.DoesNotExist: <br /> return None <br /> # Find the root page and the specific translation <br /> else: <br /> # If am not the root, find the root page with the given language, <br /> # otherwise find the page that is a translation of me in the given language <br /> return Page.objects.filter( <br /> models.Q(id=self.translation_of.id) | <br /> models.Q(translation_of=self.translation_of.id), <br /> language=language) <br /></code> <br /> <br />In local_models.py there's this validator to check if the translation_of attribute was not set for pages in the default language: <br /> <br /><code> <br />def validate_translation_of(field_data, all_data): <br /> if field_data is not None and len(str(field_data)) > 0 and all_data['language'] == settings.DEFAULT_LANGUAGE: <br /> raise validators.ValidationError("Do not set the translation for english pages.") <br /></code> Wed, 08 Nov 2006 16:44:56 GMT http://snippets.dzone.com/posts/show/2979 fdb (Frederik De Bleser)