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Fixed #19887 - Noted when callables may be used in ModelAdmin.fields and ModelAdmin.fieldset.
Thanks Patrick Strasser for the suggestion and Zbigniew Siciarz for the patch.
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@ -186,6 +186,11 @@ subclass::
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values defined in :attr:`ModelAdmin.readonly_fields` to be displayed as
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read-only.
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The ``fields`` option, unlike :attr:`~ModelAdmin.list_display`, may contain
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only field names of the model or the form specified by
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:attr:`~ModelAdmin.form`, not callables. However it *can* contain callables
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if they are defined in :attr:`~ModelAdmin.readonly_fields`.
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To display multiple fields on the same line, wrap those fields in their own
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tuple. In this example, the ``url`` and ``title`` fields will display on the
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same line and the ``content`` field will be displayed below them in its
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@ -265,6 +270,10 @@ subclass::
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``fields`` can contain values defined in
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:attr:`~ModelAdmin.readonly_fields` to be displayed as read-only.
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If you add a callable name to ``fields``, the same rule applies as
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with :attr:`~ModelAdmin.fields` option: the callable must be
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specified in :attr:`~ModelAdmin.readonly_fields`.
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* ``classes``
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A list containing extra CSS classes to apply to the fieldset.
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