new_contents: from django.db.models import Min, Max
  from ...pricing import Price
  
  class FieldGetter(object):
      def __init__(self, field_name='price', currency=None):
          self.currency = currency
          self.field_name = field_name
  
  
  class ProductFieldGetter(FieldGetter):
      def get_variant_price(self, variant, currency, quantity=1, **kwargs):
          price = kwargs.pop('price')
          if self.currency and self.currency != currency:
              return price
          try:
              instance_price = getattr(variant.product, self.field_name)
          except AttributeError:
              return price
          return Price(instance_price, instance_price)
  
      def get_product_price_range(self, product, currency, **kwargs):
          price = kwargs.pop('price')
          if self.currency and self.currency != currency:
              return price
          try:
              instance_price = getattr(product, self.field_name)
          except AttributeError:
              return price
          return (Price(instance_price, instance_price),
                  Price(instance_price, instance_price))
  
  
  class VariantFieldGetter(FieldGetter):
      def get_variant_price(self, variant, currency, quantity=1, **kwargs):
          price = kwargs.pop('price')
          if self.currency and self.currency != currency:
              return price
          try:
              instance_price = getattr(variant, self.field_name)
          except AttributeError:
              return price
          return Price(instance_price, instance_price)
  
      def get_product_price_range(self, product, currency, **kwargs):
          price = kwargs.pop('price')
          if self.currency and self.currency != currency:
              return price
          minmax = product.variants.all().aggregate(
                      min_price=Min(self.field_name),
                      max_price=Max(self.field_name))
          return (Price(minmax['min_price'], minmax['min_price']),
                  Price(minmax['max_price'], minmax['max_price']))
  
subject: Add trivial pricing handler - Product/Variant field getter