Twig does not replace blocks from child template - twig

I have a simple setup. A parent template with some {% block ... %} elements and a child template which defines those elements.
Oddly (to me as a beginner), no {% block ... %} element is recognized.
The code:
{# main.twig #}
Hello {% block greeting %}{% endblock %}
{% block body %}{% endblock %}
{# child.twig #}
{% extends "main.twig" %}
{% block greeting %}friend{% endblock %}
{% block body %}Some text{% endblock %}
{% block footer %}{% endblock %}
This is already not working
Here a (not working) example of the exact problem:
https://twigfiddle.com/p2i0ix
In the example I also added a third level:
{# child_extend.twig #}
{% extends "child.twig" %}
{% block footer %}Footer text{% endblock %}
As you can see in the example, no {% block ... %} gets output.
Naturally I want all my blocks to get replaced and shown in the respective templates.
I am surely missing something blindingly obvious.
Thank you in advance for your help.


In your twigfiddle, check the file you want to test as the main template.
If you want to test child.twig, check this as the main template.
The other problem is that the block foot is not the main file, from which it does not appear.
either you put it in the main file, or you can do something like that:
{# child.twig #}
{% extends "main.twig" %}
{% block greeting %}friend{% endblock %}
{% block body %}Some text
{% block footer %}{% endblock %}
{% endblock %}
It's just for the example, the better is to put the block footer in the main file and only fill in the file child_extend.twig
{# main.twig #}
Hello {% block greeting %}{% endblock %}
{% block body %}{% endblock %}
{% block footer %}{% endblock %}
-------------------------------
{# child.twig #}
{% extends "main.twig" %}
{% block greeting %}friend{% endblock %}
{% block body %}Some text{% endblock %}
-------------------------------
{# child_extend.twig #}
{% extends "child.twig" %}
{% block footer %}Footer text{% endblock %}

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Twig, is it possible to override an tag atribute of parent template from a child template?

I have two templates, a parent template and a child template.
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<body>
{% block body %}{% endblock %}
{% block javascripts %}{% endblock %}
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And this child.html.twig file :
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Thanks for help :)

You should modify the parent template adding a block, as example:
parent.html.twig
<body {% block bodyclass %}{% endblock %}>
{% block body %}{% endblock %}
{% block javascripts %}{% endblock %}
</body>
and use in the child:
child.html.twig
{% extends 'parent.html.twig' %}
{% block bodyclass %}class="child-class"{% endblock %}
{% block body %}
{# ... #}
{% endblock %}
You can try in this twigfiddle

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I use Kohana with twig and extend a template within a template. Param, which is available in my template is not passed to the extended template. How to pass all or at least that value to the extended template?
{% extends 'customer/main' %}
{% block content %}
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Use grandparent block

I have the following twig templates:
{# layout.twig #}
{% block content %}
THIS IS LAYOUT
{% endblock %}
{# secondary_layout.twig #}
{% extends layout.twig %}
{% block content %}
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{% endblock %}
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{# I WOULD LIKE TO USE layout content block here #}
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I can call parent() inside the content block in mypage.twig, but how to use a grandparent instead?

There are situations, in which you can achieve this. Unfortunately not in your case. However, it works if only "horizontal re-use" is used (use keyword), but not with inheritance (extends). This for instance applies to form themes.
In my case I defined a form theme which inherits from the bootstrap 3 form theme. The bootstrap theme itself inherits from "form_div_layout". I wanted to override the choice widget and include the grand parent's (form_div_layout) block content, because the bootstrap version of the block didn't fit for me in this single case. So, basically a very similar problem.
This can be solved by inheriting from both, the parent (bootstrap_3_layout) and grand parent layout (form_div_layout), while declaring an alias for the grand parent block to be overridden:
{# my_form_theme.html.twig #}
{% use 'form_div_layout.html.twig' with choice_widget_collapsed as base_choice_widget_collapsed %}
{% use 'bootstrap_3_layout.html.twig' %}
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I'm writing this answer, although it doesn't answer the actual question. But other people will probably also find this question when googling for such a "grandparent"-feature and maybe they'll give up unnecessarily, when they read that it's impossible here.

Ok by writing the problem I got one solution, just modify secondary_layout
{# secondary_layout.twig #}
{% extends layout.twig %}
{% block content %}
{% if use_layout_block %}
{{ parent() }}
{% else %}
THIS IS SECONDARY_LAYOUT
{% endif %}
{% endblock %}
{# mypage.twig #}
{% extends secondary_layout.twig %}
{% block content %}
{% set use_layout_block = true %}
{% endblock %}
It may help someone.
If someone got another solution, feel free to answer.

You can include the block of any template with the function block().
block - Documentation - Twig
block(<block_name>, [template_name])
In your case, the solution could be as follows:
{# mypage.twig #}
{% extends secondary_layout.twig %}
{% block content %}
{{ block('content', 'layout.twig') }}
{% endblock %}

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My problem is that I can't do this way. Can somebody recommend a solution?

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I think you are looking for embed instead of include.
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