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[Cookbook][Forms] Add how to generic form type extension #5154

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[Cookbook][Forms] Add how to generic form type extension #5154

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3 changes: 3 additions & 0 deletions cookbook/form/create_form_type_extension.rst
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Expand Up @@ -129,6 +129,9 @@ The ``alias`` key of the tag is the type of field that this extension should
be applied to. In your case, as you want to extend the ``file`` field type,
you will use ``file`` as an alias.

If you want to apply the extension to all field types, you can specify ``form``
as alias and value returned by ``getExtendedType()``.

Adding the extension Business Logic
-----------------------------------

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