Some Django glue to make factory-boy work with modeltranslation. Tested with python 2.7.2, django 1.3.1, factory-boy 1.1.3, and django-modeltranslation 0.3.3

modeltranslationfactory.py

import factory
import modeltranslation

class ModelTranslationFactory(factory.DjangoModelFactory):
    """Abstract Factory for models registered with modeltranslation.
    
    Factories inheriting this produce objects with fields that adhere to the 
    'Rules for translated field access' specified by modeltranslation.
    
    See:
    http://code.google.com/p/django-modeltranslation/wiki/InstallationAndUsage
    """
    
    ABSTRACT_FACTORY = True
    
    @classmethod
    def _prepare(cls, create, **kwargs):
        trans_fields = modeltranslation.translator.translator._registry[cls._associated_class].fields
        for field in trans_fields:
            tfield = '{0}_{1}'.format(field, modeltranslation.settings.DEFAULT_LANGUAGE)
            if field in kwargs:
                kwargs[tfield] = kwargs[field]
            elif tfield in kwargs:
                kwargs[field] = kwargs[tfield]
        return super(ModelTranslationFactory, cls)._prepare(create, **kwargs)

I tried to make it work with Django 1.8, django-modeltranslation 0.12.2, factory-boy 2.10, but no luck.

For anyone who stumbles here, you can still use factoryboy for unit testing. Just put in mind that factory boy doesn't update the initial values for other languages. You can update your other languages value, by using:

with translation.override('id'):
    model.title = indonesian_title
    model.save()