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Added info on doctrine metadata implications on validation #6649

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9 changes: 9 additions & 0 deletions book/forms.rst
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Expand Up @@ -1277,6 +1277,15 @@ data is transferred to the underlying object immediately. If you want to
persist that data, you simply need to persist the object itself (which already
contains the submitted data).

Using Doctrine metadata for validation
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If you've defined a `length` property of your Doctrine entity, a corresponding
`maxlength` attribute will be added automatically when rendering the form.
However, this only accounts for client-side validation on compatible browsers.
For true server-side validation, you still need to define corresponding rules,
as explained in :doc:`/book/validation`. Currently, it is not possible to re-use
Doctrine mapping metadata for validation directly.

.. index::
single: Forms; Embedded forms

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