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Commit3a478a2

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minor#6297 clarify the signature of the choice_value callable (backbone87)
This PR was squashed before being merged into the 2.7 branch (closes#6297).Discussion----------clarify the signature of the choice_value callable| Q | A || --- | --- || Doc fix? | yes || New docs? | no || Applies to | 2.7+ || Fixed tickets | |Commits-------5cf83f6 clarify the signature of the choice_value callable
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‎reference/forms/types/options/choice_value.rst.inc‎

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@@ -11,8 +11,14 @@ in HTML and submitted in the POST/PUT requests. You don't normally need to worry
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about this, but it might be handy when processing an API request (since you can
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configure the value that will be sent in the API request).
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This can be a callable or a property path. See `choice_label`_ for similar usage.
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If ``null`` is used, an incrementing integer is used as the name.
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This can be a callable or a property path. If ``null`` is given, an incrementing
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integer is used as the value.
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.. note::
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In contrast to other choice options (e.g. `choice_label`_), the callable for
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the ``choice_value`` option takes as **only** argument the actual choice, which
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is also the value that gets passed to your model when submitting the form.
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If you are using a callable to populate ``choice_value``, you need to check
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for the case that the value of the field may be ``null``.

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