Haystack indexing support for both 1.2 style, and the new 2.0 style classes.

search_indexes.py

import logging
from haystack.fields import CharField  # Whatever fields you want ...
from myapp.models import MyModel

logger = logging.getLogger(__name__)

try:
    # haystack 1.2x
    from haystack import site
    from haystack.indexes import SearchIndex
    class Indexable(object): pass
    logger.info('Haystack 1.x found')
except ImportError:
    # haystack 2.0
    site = None
    from haystack.indexes import SearchIndex, Indexable
    logger.info('Haystack 2.x found')
    

class MyIndex(SearchIndex, Indexable):
    url = CharField(model_attr='get_absolute_url')  # example, using the fields we imported.
    
    def get_model(self):
        """ 2.X style """
        if not hasattr(self, 'model'):
            self.model = MyModel
        return self.model

    def index_queryset(self, using=None):
        """ calling get_model makes us safe on both versions"""
        return self.get_model().objects.all()
        
if site is not None:
    #: 1.2.X style
    site.register(MyModel, MyIndex)