Due to python's method resolution order, you need to have mixins first in 
the class inheritance order.  Specifically

class UnitViewSet(MultipleFieldLookupMixin, viewsets.ReadOnlyModelViewset):
    ...

See 
https://stackoverflow.com/questions/1848474/method-resolution-order-mro-in-new-style-classes
 for 
more information about MROs

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