old_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  from rest_framework import serializers
  from drf_haystack.serializers import HaystackSerializer
  
  
  class ProductSearchSerializer(HaystackSerializer):
      """
      The base serializer to represent one or more product fields for being returned as a
      result list during searches.
      """
      price = serializers.SerializerMethodField()
  
      class Meta:
          fields = ('text', 'autocomplete', 'product_name', 'product_url', 'price',)
          ignore_fields = ('text', 'autocomplete')
          field_aliases = {'q': 'text'}
  
      def get_price(self, search_result):
          """
          The price can't be stored inside the search index but must be fetched from the resolved
          model. In case your product models have a fixed price, try to store it as
          ``indexes.DecimalField`` and retrieve from the search index, because that's much faster.
          """
          if search_result.object:
              return search_result.object.get_price(self.context['request'])
  
new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  from rest_framework import serializers
  from drf_haystack.serializers import HaystackSerializer
  
  
  class ProductSearchSerializer(HaystackSerializer):
      """
      The base serializer to represent one or more product fields for being returned as a
      result list during searches.
      """
      price = serializers.SerializerMethodField()
  
      class Meta:
          fields = ['text', 'autocomplete', 'product_name', 'product_url', 'price']
          ignore_fields = ['text', 'autocomplete']
          field_aliases = {'q': 'text'}
  
      def get_price(self, search_result):
          """
          The price can't be stored inside the search index but must be fetched from the resolved
          model. In case your product models have a fixed price, try to store it as
          ``indexes.DecimalField`` and retrieve from the search index, because that's much faster.
          """
          if search_result.object:
              return search_result.object.get_price(self.context['request'])
  
subject: use lists instead of tuples