Advanced Topics

Swapping Backends

As part of the backend loading infrastructure, you can load more than one search backend at a time or dynamically swap out the backend being used. The following code demonstrates loading the simple backend:

import haystack
simple_backend = haystack.load_backend('simple')

If no argument is provided, Haystack will load whatever is in the HAYSTACK_SEARCH_ENGINE setting. Otherwise, any of the following strings will load their respective backend.

  • solr
  • xapian
  • whoosh
  • simple
  • dummy

You can also provide the “short” portion of the name (before the _backend) of a custom backend. Haystack will attempt to load that backend instead from your PYTHONPATH.

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