from haystack.forms import SearchForm

class BooksSearchForm(SearchForm):

    def no_query_found(self):
        return self.searchqueryset.all()

    def search(self):
        # First, store the SearchQuerySet received from other processing. (the main work is run internally by Haystack here).
        sqs = super(BooksSearchForm, self).search()

        # if something goes wrong
        if not self.is_valid():
            return self.no_query_found()

        # you can then adjust the search results and ask for instance to order the results by title
        #sqs = sqs.order_by(priority)

        return sqs
