Re: Runtime decision on language support

[Shawn Thomas]

Thank you so much for your incredibly thorough response, Emmanuel! That is 
exactly the kind of insight I was hoping for.

Best,
Shawn


From: django-users@googlegroups.com <django-users@googlegroups.com> on behalf 
of ASAMOAH EMMANUEL <emmanuelasamoah...@gmail.com>
Date: Monday, April 24, 2023 at 10:22 PM
To: django-users@googlegroups.com <django-users@googlegroups.com>
Subject: Re: Runtime decision on language support

To achieve this, you can create a custom middleware that inherits from 
`LocaleMiddleware`. In your custom middleware, you can override the 
`process_request` method to check for the tenant's allowed languages and set 
the request's language accordingly.

1. Create a new model field for the Tenant model that stores the allowed 
languages as a list. This can be a JSON field or a ManyToMany field linked to a 
Language model.

# models.py
from django.contrib.postgres.fields import ArrayField
from django.db import models

class Tenant(models.Model):
    ...
    allowed_languages = ArrayField(models.CharField(max_length=10))


2. Create a custom middleware that inherits from 
`django.middleware.locale.LocaleMiddleware`:
# custom_middleware.py
from django.middleware.locale import LocaleMiddleware
from django.utils import translation

class CustomLocaleMiddleware(LocaleMiddleware):
    def process_request(self, request):
        # Get the current tenant
        current_tenant = request.tenant

        # Get the user's preferred language from the request
        language = translation.get_language_from_request(request, 
check_path=True)

        # Check if the preferred language is in the tenant's allowed_languages 
list
        if language not in current_tenant.allowed_languages:
            # If not, set the default language for the tenant
            language = current_tenant.default_language

        # Activate the chosen language
        translation.activate(language)
        request.LANGUAGE_CODE = translation.get_language()
3. Replace `LocaleMiddleware` with your custom middleware in your `MIDDLEWARE` 
settings:

# settings.py
MIDDLEWARE = [
    ...
    # 'django.middleware.locale.LocaleMiddleware',
    'your_app.custom_middleware.CustomLocaleMiddleware'.
Now, when a user requests a page, the custom middleware checks if the requested 
language is in the tenant's `allowed_languages` list. If it is not, the 
tenant's default language will be used. This ensures that the UI and the data 
are shown in a consistent language.
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