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Update usage.rst
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@ -22,7 +22,7 @@ It is also possible to order objects relative to another object that is a Foreig
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.. note:: A small caveat here is that ``Category`` must also either inherit from ``Sortable`` or include an ``order`` property which is a ``PositiveSmallInteger`` field. This is due to the way Django admin instantiates classes.
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from adminsortable.fields import SortableForeignKey
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from adminsortable.fields import SortableForeignKey
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# models.py
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class Category(Sortable):
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