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add note on return values when null is passed to a data transformer's tr... #3306

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Dec 19, 2013
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add note on return values when null is passed to a data transformer's tr... #3306

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6 changes: 6 additions & 0 deletions cookbook/form/data_transformers.rst
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Expand Up @@ -97,6 +97,12 @@ for converting to and from the issue number and the ``Issue`` object::
If you want a new issue to be created when an unknown number is entered, you
can instantiate it rather than throwing the ``TransformationFailedException``.

.. note::

When ``null`` is passed to the ``transform()`` method, your transformer
should return an equivalent value of the type it is transforming to (e.g.
an empty string, 0 for integers or 0.0 for floats).

Using the Transformer
---------------------

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