text: # "Hey, Django! Look at me, I'm an app! For Serious!"
  from __future__ import unicode_literals
  from django.conf import settings
  from django.core.exceptions import ObjectDoesNotExist
  from django.db import models
  from django.utils import six
  from django.utils.text import capfirst
  from haystack.exceptions import NotHandled, SpatialError
  from haystack.utils import log as logging
  
  try:
      from django.utils.encoding import force_text
  except ImportError:
      from django.utils.encoding import force_unicode as force_text
  
  try:
      from geopy import distance as geopy_distance
  except ImportError:
      geopy_distance = None
  
  
  # Not a Django model, but tightly tied to them and there doesn't seem to be a
  # better spot in the tree.
  class SearchResult(object):
      """
      A single search result. The actual object is loaded lazily by accessing
      object; until then this object only stores the model, pk, and score.
  
      Note that iterating over SearchResults and getting the object for each
      result will do O(N) database queries, which may not fit your needs for
      performance.
      """
      def __init__(self, app_label, model_name, pk, score, **kwargs):
          self.app_label, self.model_name = app_label, model_name
          self.pk = pk
          self.score = score
          self._object = None
          self._model = None
          self._verbose_name = None
          self._additional_fields = []
          self._point_of_origin = kwargs.pop('_point_of_origin', None)
          self._distance = kwargs.pop('_distance', None)
          self.stored_fields = None
          self.log = self._get_log()
  
          for key, value in kwargs.items():
              if not key in self.__dict__:
                  self.__dict__[key] = value
                  self._additional_fields.append(key)
  
      def _get_log(self):
          return logging.getLogger('haystack')
  
      def __repr__(self):
          return "<SearchResult: %s.%s (pk=%r)>" % (self.app_label, self.model_name, self.pk)
  
      def __unicode__(self):
          return force_text(self.__repr__())
  
      def __getattr__(self, attr):
          if attr == '__getnewargs__':
              raise AttributeError
  
          return self.__dict__.get(attr, None)
  
      def _get_searchindex(self):
          from haystack import connections
          return connections['default'].get_unified_index().get_index(self.model)
  
      searchindex = property(_get_searchindex)
  
      def _get_object(self):
          if self._object is None:
              if self.model is None:
                  self.log.error("Model could not be found for SearchResult '%s'.", self)
                  return None
  
              try:
                  try:
                      self._object = self.searchindex.read_queryset().get(pk=self.pk)
                  except NotHandled:
                      self.log.warning("Model '%s.%s' not handled by the routers.", self.app_label, self.model_name)
                      # Revert to old behaviour
                      self._object = self.model._default_manager.get(pk=self.pk)
              except ObjectDoesNotExist:
                  self.log.error("Object could not be found in database for SearchResult '%s'.", self)
                  self._object = None
  
          return self._object
  
      def _set_object(self, obj):
          self._object = obj
  
      object = property(_get_object, _set_object)
  
      def _get_model(self):
          if self._model is None:
              try:
                  self._model = models.get_model(self.app_label, self.model_name)
              except LookupError:
                  # this changed in change 1.7 to throw an error instead of
                  # returning None when the model isn't found. So catch the
                  # lookup error and keep self._model == None.
                  pass
  
          return self._model
  
      def _set_model(self, obj):
          self._model = obj
  
      model = property(_get_model, _set_model)
  
      def _get_distance(self):
          from haystack.utils.geo import Distance
  
          if self._distance is None:
              # We didn't get it from the backend & we haven't tried calculating
              # it yet. Check if geopy is available to do it the "slow" way
              # (even though slow meant 100 distance calculations in 0.004 seconds
              # in my testing).
              if geopy_distance is None:
                  raise SpatialError("The backend doesn't have 'DISTANCE_AVAILABLE' enabled & the 'geopy' library could not be imported, so distance information is not available.")
  
              if not self._point_of_origin:
                  raise SpatialError("The original point is not available.")
  
              if not hasattr(self, self._point_of_origin['field']):
                  raise SpatialError("The field '%s' was not included in search results, so the distance could not be calculated." % self._point_of_origin['field'])
  
              po_lng, po_lat = self._point_of_origin['point'].get_coords()
              location_field = getattr(self, self._point_of_origin['field'])
  
              if location_field is None:
                  return None
  
              lf_lng, lf_lat = location_field.get_coords()
              self._distance = Distance(km=geopy_distance.distance((po_lat, po_lng), (lf_lat, lf_lng)).km)
  
          # We've either already calculated it or the backend returned it, so
          # let's use that.
          return self._distance
  
      def _set_distance(self, dist):
          self._distance = dist
  
      distance = property(_get_distance, _set_distance)
  
      def _get_verbose_name(self):
          if self.model is None:
              self.log.error("Model could not be found for SearchResult '%s'.", self)
              return u''
  
          return force_text(capfirst(self.model._meta.verbose_name))
  
      verbose_name = property(_get_verbose_name)
  
      def _get_verbose_name_plural(self):
          if self.model is None:
              self.log.error("Model could not be found for SearchResult '%s'.", self)
              return u''
  
          return force_text(capfirst(self.model._meta.verbose_name_plural))
  
      verbose_name_plural = property(_get_verbose_name_plural)
  
      def content_type(self):
          """Returns the content type for the result's model instance."""
          if self.model is None:
              self.log.error("Model could not be found for SearchResult '%s'.", self)
              return u''
  
          return six.text_type(self.model._meta)
  
      def get_additional_fields(self):
          """
          Returns a dictionary of all of the fields from the raw result.
  
          Useful for serializing results. Only returns what was seen from the
          search engine, so it may have extra fields Haystack's indexes aren't
          aware of.
          """
          additional_fields = {}
  
          for fieldname in self._additional_fields:
              additional_fields[fieldname] = getattr(self, fieldname)
  
          return additional_fields
  
      def get_stored_fields(self):
          """
          Returns a dictionary of all of the stored fields from the SearchIndex.
  
          Useful for serializing results. Only returns the fields Haystack's
          indexes are aware of as being 'stored'.
          """
          if self._stored_fields is None:
              from haystack import connections
              from haystack.exceptions import NotHandled
  
              try:
                  index = connections['default'].get_unified_index().get_index(self.model)
              except NotHandled:
                  # Not found? Return nothing.
                  return {}
  
              self._stored_fields = {}
  
              # Iterate through the index's fields, pulling out the fields that
              # are stored.
              for fieldname, field in index.fields.items():
                  if field.stored is True:
                      self._stored_fields[fieldname] = getattr(self, fieldname, u'')
  
          return self._stored_fields
  
      def __getstate__(self):
          """
          Returns a dictionary representing the ``SearchResult`` in order to
          make it pickleable.
          """
          # The ``log`` is excluded because, under the hood, ``logging`` uses
          # ``threading.Lock``, which doesn't pickle well.
          ret_dict = self.__dict__.copy()
          del(ret_dict['log'])
          return ret_dict
  
      def __setstate__(self, data_dict):
          """
          Updates the object's attributes according to data passed by pickle.
          """
          self.__dict__.update(data_dict)
          self.log = self._get_log()
  
  
  def reload_indexes(sender, *args, **kwargs):
      from haystack import connections
  
      for conn in connections.all():
          ui = conn.get_unified_index()
          # Note: Unlike above, we're resetting the ``UnifiedIndex`` here.
          # Thi gives us a clean slate.
          ui.reset()
  