Alternative to blocktrans tag with long `with` clause

Question

Context

I'm trying to use the django template engine to render translatable part of a page using variable from the context. Specifically, this is my use case

{% blocktrans trimmed with type=training.type title=training.title city=training.city %}
Training {{ type }} "{{ title }}" at {{ city }}
{% endblocktrans %}

This works fine, however, my issue with it that the blocktrans length grows very quicky above the acceptable (at least, for me).

As an alternative, I could do

    {% with training.title as title %}
    {% with training.type as type %}
    {% with training.city as city %}
    {% blocktrans trimmed %}
    Training {{ type }} "{{ title }}" at {{ city }}
    {% endblocktrans %}
    {% endwith %}
    {% endwith %}
    {% endwith %}

Or using one separate with clause.

But that does not really ease the readability of that code, especially if there is more variables to expose to the translation string.

Solution I thought of

My initial idea was to extends the blocktrans tag onto several lines :

{% blocktrans trimmed with 
    type=training.type
    title=training.title
    city=training.city %}
Training {{ type }} "{{ title }}" at {{ city }}
{% endblocktrans %}

Unfortunately for me, django does not support multilline tags in templates.

(see the rather lengthy dicussion on django mailing list for the why).

Question

Since I did not find in the above mentioned discussion a solution, I'm searching for a way to obtain the same result as in my first code, without hampering my templates readability with overly long lines/big blocks of with tags.

I thought about putting that code elsewhere, like a @property methods in the model training is based on. But it seems to me that the that logic belongs to the template, (it's very unlikely it will be used anywhere else).

Is there a alternative, idiomatic way to achieve this in django ?

Maybe this is the solution ? I am not sure it's working ... `{% blocktrans trimmed with t=training %} Training {{ t.type }} "{{ t.title }}" at {{ t.city }} {% endblocktrans %}` — Jonathan Le Cornichone, Aug 08 '18 at 15:08

score 0 · Answer 1 · answered Jun 14 '19 at 08:47

One way to to do this is to create a custom template tag for setting the variables inside the template

from django import template

register = template.Library()

@register.simple_tag
def setvar(val):
    return val

and in template

{% load setvar %}
{% setvar training.title as title %}
{% setvar training.type as type %}
{% setvar training.city as city %}
{% blocktrans trimmed %}
    Training {{ type }} "{{ title }}" at {{ city }}
{% endblocktrans %}

This also supports filters, for example

{% setvar training.title|title as title %}

Alternative to blocktrans tag with long `with` clause

Context

Solution I thought of

Question

1 Answers1