def setIndexMode(self, mode):
        self.indexMode = mode
Function that can be curried to provide the source accessor or DB column name for the m2m table
dataset/ETHPy150Open VisTrails/VisTrails/contrib/cdat/cdat_window.py/QSliderCombo.setIndexMode--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Django-1.6.10/django/db/models/fields/related.py/ManyToManyField._get_m2m_attr