Nested blocks in Django templates

Question

The master template in my Django app looks like this:

{% block parent %}
    Some text...
    {% block child %}
        Default content here...
    {% endblock child %}
    ...some more text
{% endblock parent %}

Now, this template should be overwritten in a way that the child block is changed:

{% extends "master.html" %}

{% block child %}
    New content here...
{% endblock child%}

However, the rendering stays the same (printing "default content here..."). Have I missed something obvious or are nested blocks not possible? (Or, violating the DRY principle, have I to re-define the parent block?)

Edit: I'm working with Django 1.1, if that matters.

Something else is wrong here, because (also using 1.1) I am unable to replicate this problem. For me, simply overriding the child block, without any reference to the parent block, has the desired effect. — Ben James
– Ben James, Commented Dec 14, 2009 at 13:34
Yes, you're right. See my answer below. Thanks for looking at it. — Boldewyn
– Boldewyn, Commented Dec 14, 2009 at 13:49

Boldewyn · Accepted Answer · 2009-12-14 15:15:30Z

13

OK, it's a bug in Django's template system. For most other cases, Ben James is right (see his comment to my question above).

In my case, the child block was inside a {% ifnotequal a b %} block, and that breaks the block inheritance. I consider that to be a bug, since there are dozens of natural use cases for such operations.

The corresponding ticket.

edited Dec 14, 2009 at 15:15

answered Dec 14, 2009 at 13:48

Boldewyn

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2 Comments

Ben James Over a year ago

It's a good idea to always test the code you are posting, rather than assuming that what you took out won't affect the outcome.

Boldewyn Over a year ago

True, true... I had a custom template tag in it in the first place and suspected that, but after throwing it out I didn't think about the ifnotequal.

lprsd · Accepted Answer · 2009-12-14 13:25:33Z

-1

Do this:

{% extends "master.html" %}

{% block parent %}
    {% block child %}
        New content here...
    {% endblock child%}
{% endblock parent %}

answered Dec 14, 2009 at 13:25

lprsd

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3 Comments

Dominic Rodger Over a year ago

What if the base parent block contains anything other than the child block?

Boldewyn Over a year ago

Thanks for the answer, but unfortunately it's not useful. That is partly my mistake, I updated the example for the master template above. Problem: The reason for the master template is, that there is more data in it. If I do as you suggest, all this additional data is of course lost.

christk Over a year ago

doing that may break website functionality, it requests 2 times the child page, therefore it may duplicate script tags and more.

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