def by_parent(self, parent):
        return ProductVariation.objects.filter(parent=parent)
Returns the state action value, Q(s,a), by performing one step
dataset/ETHPy150Open dokterbob/satchmo/satchmo/apps/product/modules/configurable/models.py/ProductVariationManager.by_parent--crossover with--dataset/ETHPy150Open rlpy/rlpy/rlpy/Representations/Representation.py/Representation.Q_oneStepLookAhead