如何配置Django网站默认俄语并支持用户切换至英文（基于i18n）

Hey there! Your current configuration is already 90% of the way there—let's refine it and add the necessary pieces to make the language switch work seamlessly for your users.

1. Confirm Your Core Configuration is Correct #

First, let's double-check your settings to ensure they align with your goal. Here's the validated version with key context:

import os
from django.utils.translation import gettext_lazy as _

BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',  # Critical: LocaleMiddleware needs to come after this
    'django.middleware.locale.LocaleMiddleware',  # Your placement here is perfect!
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

LANGUAGE_CODE = 'ru'  # Forces Russian as the default language for all first-time visitors
LANGUAGES = (
    ('ru', _('Russian')),
    ('en', _('English')),
)
LOCALE_PATHS = (
    os.path.join(BASE_DIR, 'locale'),  # Where your translation files are stored
)
TIME_ZONE = 'Europe/Kiev'
USE_I18N = True
USE_L10N = True
USE_TZ = True

Key Notes:

• The LocaleMiddleware position matters: it must sit after SessionMiddleware (to remember user preferences) and before CommonMiddleware (to apply language settings to requests).
• Using gettext_lazy as _ ensures the language names (like "Russian" or "English") are translatable if you ever want to localize those labels.

2. Add Language Switch Functionality #

To let users toggle to English, you need two key components: a URL route for the language switch view, and a template form to trigger it.

Step 2.1: Update Your URLconf #

Add this line to your project's main urls.py to enable Django's built-in language switch view:

from django.conf.urls import include

# Your existing URL patterns here

# Add this to activate the set_language endpoint
urlpatterns += [
    path('i18n/', include('django.conf.urls.i18n')),
]

# Optional: If you want URL prefixes (e.g., /en/ or /ru/), use i18n_patterns
# urlpatterns += i18n_patterns(
#     path('', include('your_app.urls')),
# )

Step 2.2: Add a Language Switch Form in Your Template #

Insert this form wherever users should access the language toggle (e.g., site header, footer):

<form action="{% url 'set_language' %}" method="post">
    {% csrf_token %}
    <input name="next" type="hidden" value="{{ request.path }}">
    <select name="language" onchange="this.form.submit()">
        {% get_current_language as LANGUAGE_CODE %}
        {% get_available_languages as LANGUAGES %}
        {% get_language_info_list for LANGUAGES as languages %}
        {% for language in languages %}
            <option value="{{ language.code }}" {% if language.code == LANGUAGE_CODE %}selected{% endif %}>
                {{ language.name_local }} ({{ language.code }})
            </option>
        {% endfor %}
    </select>
</form>

How this works:

• The form submits to Django's set_language view, which saves the user's language preference in their session.
• The next hidden input ensures users stay on the same page after switching languages.
• The dropdown shows languages with their local names (e.g., "Русский" for Russian, "English" for English) for better user clarity.

3. Validate Your Translation Files #

Make sure your translation files are properly set up:

1. Extract translatable strings into .po files:

   python manage.py makemessages -l ru -l en
   

2. Edit the .po files in locale/ru/LC_MESSAGES/django.po and locale/en/LC_MESSAGES/django.po to add your translated content.
3. Compile the .po files into binary .mo files (Django uses these to load translations):

   python manage.py compilemessages
   

Final Checks #

• Test your site: First-time visitors should see Russian by default.
• Use the dropdown to switch to English—your session will remember this preference on subsequent visits.
• If you use i18n_patterns, URLs will automatically get language prefixes (like /en/about), which is great for SEO and direct linking.

内容的提问来源于stack exchange，提问作者yaschk1