Sometimes string interpolation is needed in templates

[aalexgabi]

Sometimes string interpolation is needed in templates. I.e. ​http://stackoverflow.com/questions/14626680/how-to-interpolate-already-translated-string-in-django-templates

I made a pull request here ​https://github.com/django/django/pull/699

[anonymous]

(Reading the Stack Overflow question) I don't understand what's the relationship with translation.

If you need to interpolate and translate you can simply use the blocktrans tag in the i18n template library.

[Carl Meyer]

I don't think this is nearly a common enough need to warrant adding a new built-in filter to Django. There's a reason Django lets you write your own filters and tags when you need them, and this one is easy enough to write for those who want it.

[aalexgabi]

If the view and the template are generic it is not possible to use blocktrans. Specific parameters for generic views are passed in urls.py. Here is an example:

urls.py

    (r'^media/delete/(?P<object_id>[0-9]+)/$', views.generic_delete, {
        'model': models.Media,
        'template_name': 'openservices/partials/generic_delete.html',
        'extra_context': {
            'page_title': _('Delete media'),
            'message': _('Do you want to remove media %s? Media will be lost!'),
        },

generic_delete.html

{% block content %}
    <div class="modal in" tabindex="-1" role="dialog"
         aria-labelledby="formHeader" aria-hidden="true" data-keyboard="false" data-backdrop="static"
         style="display: block">
        <form class="form-horizontal" method="post">
            <div class="modal-header">
                <a class="close" href="{{ next }}">×</a>
                <h3 id="formHeader">
                    {{ page_title }}
                </h3>
            </div>
            <div class="modal-body">
                <p class="text-error">
                    {{ message|interpolate:object }}
                </p>
                {% csrf_token %}
            </div>
            <div class="modal-footer">
                <a class="btn" href="{{ next }}">{% trans 'Close' %}</a>
                <input type="submit" class="btn btn-danger" value="{% trans 'Delete' %}">
            </div>
        </form>
    </div>
    <a class="modal-backdrop in" href="{{ next }}"></a>
{% endblock %}

The same template and view is used for multiple models. For each model there is a different confirmation message. Blocktrans cannot be used because it requires hard coding the string that needs to be translated in the template.

[Aymeric Augustin]

URLconfs aren't supposed to contain your entire application.

In this case it's much more reasonable to subclass the generic view and override get_context_data.