I wrote a Mixin for a DRF-API-View to dynamically support django-modeltranslation

I wrote a Mixin for the django-restframework API View to automatically deliver translations. Here is an example for German and English activated:

class AchievementSerializer(TranslatableSerializerMixin, serializers.ModelSerializer):
    class Meta:
        model = Achievement
        fields = ('slug', 'title',)

When you now make a GET request to it, you will get this as a return:

{
	"count": 6,
	"current_page": 1,
	"results": [{
		"slug": "campaign",
		"title": "Kampagne",
		"title_de": "Kampagne",
		"title_en": "Campaign"
	}, {
		"slug": "profile",
		"title": "Profil",
		"title_de": "Profil",
		"title_en": "Profile"
	}, {
		"slug": "promote-project",
		"title": "Projekt bekannt machen",
		"title_de": "Projekt bekannt machen",
		"title_en": "Promote Project"
	}, {
		"slug": "company",
		"title": "Unternehmen",
		"title_de": "Unternehmen",
		"title_en": "Company"
	}, {
		"slug": "organization",
		"title": "Organisation",
		"title_de": "Organisation",
		"title_en": "Organization"
	}, {
		"slug": "project",
		"title": "Projekt",
		"title_de": "Projekt",
		"title_en": "Project"
	}],
	"links": {
		"previous": null,
		"next": null
	}
}

You can also POST to it like normal.

[emorozov]

@iekadou How we can see the code of your mixin? Why didn’t you create a pull request?

[ilikerobots]

Here’s a simple implementation of the above (mixin renamed). By default, it will provide all translations of the serializer fields. However, if the language get parameter is provided to the request as a comma delimited string, then only those specified translations will be returned.

from django.conf import settings
from modeltranslation.manager import get_translatable_fields_for_model
from rest_framework import serializers


class TranslatedModelSerializerMixin(serializers.ModelSerializer):
    def get_field_names(self, declared_fields, info):
        fields = super().get_field_names(declared_fields, info)
        trans_fields = get_translatable_fields_for_model(self.Meta.model)
        all_fields = []

        requested_langs = []
        if 'request' in self.context:
            lang_param = self.context['request'].query_params.get('lang', None)
            requested_langs = lang_param.split(',') if lang_param else []

        for f in fields:
            if f not in trans_fields:
                all_fields.append(f)
            else:
                for l in settings.LANGUAGES:
                    if not requested_langs or l[0] in requested_langs:
                        all_fields.append("{}_{}".format(f, l[0]))

        return all_fields