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[Form] Mention that form_theme _self only works with template inheritance #11021

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Feb 21, 2019
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[Form] Mention that form_theme _self only works with template inheritance #11021

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14 changes: 10 additions & 4 deletions form/form_themes.rst
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Expand Up @@ -341,6 +341,8 @@ for any overridden form blocks:

.. code-block:: html+twig

{% extends 'base.html.twig' %}

{% form_theme form _self %}

{# this overrides the widget of any field of type integer, but only in the
Expand All @@ -359,12 +361,16 @@ for any overridden form blocks:
</div>
{% endblock %}


{# ... render the form ... #}

The disadvantage of this method is that the customized form blocks can't be
reused when rendering other forms in other templates. If that's what you need,
create a form theme in a separate template as explained in the next section.
The main disadvantage of this method is that it only works if your template
extends another (``'base.html.twig'`` in the previous example). If your template
does not, you must point ``form_theme`` to a separate template, as explained in
the next section.

Another disadvantage is that the customized form blocks can't be reused when
rendering other forms in other templates. If that's what you need, create a form
theme in a separate template as explained in the next section.

Creating a Form Theme in a Separate Template
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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