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  django-parler: Make existing fields translatable

Procedura per traduzione tabella Product

  • I campi name, slug e description (pre-esistenti) devono essere tradotti

  • Commentato ProductAdmin (sostituito con pass)

  • Rinominati i campi field --> old_field in Product

  • Creata migrazione "product_rename_old_field"

  • Product derivato da TranslatableBaseModel anziche' BaseModel

  • introdotti i campi "translations":

    translations = TranslatedFields(
        name = models.CharField(max_length=1024, verbose_name=_("Name")),
        slug = models.SlugField(_("Slug"), max_length=255, unique=True),
        description = models.TextField(blank=True, verbose_name=_("Description")),
    
        meta = {'unique_together': [('language_code', 'slug')]},
    )
    
  • Creata migrazione "product_rename_add_translation_fields"

  • Fix migrazione precedente:

    migrations.CreateModel(
        name='Product',
        ...
        bases=(parler.models.TranslatableModelMixin, models.Model),
    ),
    
  • Creata data migration "product_migrate_translatable_fields":

    from django.db import migrations
    from django.conf import settings
    
    
    def forwards_func(apps, schema_editor):
        MyModel = apps.get_model('backend', 'Product')
        MyModelTranslation = apps.get_model('backend', 'ProductTranslation')
    
        for object in MyModel.objects.all():
            MyModelTranslation.objects.create(
                master_id=object.pk,
                language_code=settings.LANGUAGE_CODE,
                name=object.old_name,
                slug=object.old_slug,
                description=object.old_description,
            )
    
    
    class Migration(migrations.Migration):
    
        dependencies = [
            ('backend', '0003_product_add_translation_fields'),
        ]
    
        operations = [
            migrations.RunPython(forwards_func),
        ]
    
  • Commentati i campi "old_field" e creata migrazione "product_remove_old_fields"

  • ProductAdmin derivata da TranslatableBaseModelAdmin anziche' BaseModelAdmin

  • In ProductAdmin, utilizzato metodo get_prepopulated_fields() anziche' attributo prepopulated_fields

  • Eseguite migrazioni