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Update groups.rst #11223

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10 changes: 10 additions & 0 deletions validation/groups.rst
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Expand Up @@ -185,3 +185,13 @@ will be applied.
Of course, you'll usually work with validation indirectly through the form
library. For information on how to use validation groups inside forms, see
:doc:`/form/validation_groups`.

.. caution::

Using validation groups might lead to unexpected results when rendering your form:
* If you let Symfony [guess your form types](https://symfony.com/doc/3.4/forms.html#field-type-guessing),
*all* constraints will be considered in the form's view (not just the ones of
the active validation groups).
* If you don't let Symfony guess your form types, no constraints will be
considered at all in the form's view. This means that in the form builder, you
have to manually set each field type option you want to have in the form's view.