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A content translation framework using Postgresql's jsonb field in the background

Project description

Introduction

nece

A “Content Translation Framework” using Postgresql’s jsonb field. It simply sets and gets translations from a jsonb field called translations.

Why?

You might ask why you should use django-nece since there are other, and more mature content translation frameworks like django-hvad and django-modeltranslation. Both of them are good in some ways, worst in others.

For instance, it is very hard for django-hvad users to get default language if there is no corresponding translation for an object. And it holds translated values in a different table, so every translation query results in another hit to the database.

On the other hand django-modeltranslation adds multiple additional fields for multiple languages. The number of fields inceases by the number of languages you need to support. At the end it becomes a huge chunk of an object if you need to add more than 20 languages.

nece? more or less works like the latter one with an important difference. It uses Postgresql’s new JSONB field to hold translation information. And overrides the original one on query.

Dependencies

postgresql >= 9.4.5
Django >= 1.9
psycopg2 >= 2.5.4

Installation

via pypi:

pip install nece

via setup.py

python setup.py install

Usage

Lets say we have a model called Fruit:

from nece.models import TranslationModel

class Fruit(TranslationModel):
    name = CharField(max_length=255)

    def __str__(self):
        return self.name

    class Meta:
        translatable_fields = ('name',)

TranslationModel adds a jsonb field to this table and sets translations in a notation like the one below:

{u'de_de': {u'name': u'Apfel'},
 u'tr_tr': {u'name': u'elma'}}

When we need the German translation we can simply choose the language and get the attribute as usual:

>> f = Fruit.objects.get(name='apple')
>> print(f.name)
apple
>> f.language('de_de')
>> print(f.name)
Apfel

You can also filter out the ones containing any language translation:

>> Fruit.objects.all()
[<Fruit: apple>, <Fruit: pear>, <Fruit: banana>]
>> Fruit.objects.language('tr_tr')
[<Fruit: elma>, <Fruit: armut>]  # there is no translation for banana
>> Fruit.objects.language_or_default('tr_tr')
[<Fruit: elma>, <Fruit: armut>, <Fruit: banana>]
>> Fruit.objects.language('tr_tr').filter(name='elma')
[<Fruit: elma>]
>> Fruit.objects.language('tr_tr').get(name='elma')
<Fruit: elma>

Updating translations

>> fruit._language_code
tr_tr
>> fruit.name
elma
>> fruit.translate(name='armut').save()
>> fruit.name
armut
>> fruit.language('en')
>> fruit.translate('it_it', name='pera')
>> fruit.language('it_it')
>> fruit.name
pera

Settings

TRANSLATIONS_DEFAULT

Default language code. Default value: `en_us`

TRANSLATIONS_MAP

Shortcuts for `languagecode_countrycode` notation.

Example:

TRANSLATIONS_MAP = {
    "en": "en_us",
    "tr": "tr_tr",
    "ar": "ar_sy",
    "bg": "bg_bg",
    "cs": "cs_cz",
    "da": "da_dk",
    ...
}

Default:

{'en': 'en_us'}

Project details


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