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Doc'd that admin site booleans are tri-state.
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@ -606,8 +606,8 @@ subclass::
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and add that method's name to ``list_display``. (See below for more
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on custom methods in ``list_display``.)
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* If the field is a ``BooleanField``, Django will display a pretty "on" or
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"off" icon instead of ``True`` or ``False``.
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* If the field is a ``BooleanField``, Django will display a pretty "yes",
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"no", or "unknown" icon instead of ``True``, ``False``, or ``None``.
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* If the string given is a method of the model, ``ModelAdmin`` or a
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callable, Django will HTML-escape the output by default. To escape
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@ -664,9 +664,9 @@ subclass::
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birth_date_view.empty_value_display = 'unknown'
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* If the string given is a method of the model, ``ModelAdmin`` or a
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callable that returns True or False Django will display a pretty
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"on" or "off" icon if you give the method a ``boolean`` attribute
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whose value is ``True``.
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callable that returns ``True``, ``False``, or ``None``, Django will
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display a pretty "yes", "no", or "unknown" icon if you give the method a
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``boolean`` attribute whose value is ``True``.
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Here's a full example model::
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