Internationalization extension for SQLAlchemy models.

• Stores translations in separate tables.
• Reflects translation table structures based on parent model table structure.
• Supports forcing of given locale.
• Good performance (uses proxy dicts and other advanced SQLAlchemy concepts for performance optimization)

Consider you have already defined SQLAlchemy connections and declarative base as follows:

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base

engine = create_engine(
    'postgres://postgres@localhost/sqlalchemy_i18n'
)
Base = declarative_base()

You only need to define two things, first you have to make the desired mapper translatable using make_translatable() function. Internally this function attaches two sqlalchemy event listeners for given mapper.

NOTICE: Calling make_translatable() for given mapper should happen only once per application.

from sqlalchemy_i18n import make_translatable

make_translatable(sa.orm.mapper)

Secondly you need to define translatable models. In the following example we add translatable Article model with two translatable properties (name and content).

import sqlalchemy as sa
from sqlalchemy_i18n import Translatable, translation_base


class Article(Base, Translatable):
    id = sa.Column(sa.Integer, autoincrement=True, primary_key=True)
    description = sa.Column(sa.UnicodeText)


class ArticleTranslation(translation_base(Article)):
    __tablename__ = 'article_translation'

    name = sa.Column(sa.Unicode(255))
    content = sa.Column(sa.UnicodeText)

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