Haystack tweaks for Django 1.7.7. I had to upgrade to Haystack 2.3.1 to get it to work with Django 1.7.7. I also had to update the Xapian backend. But I ran into problems. On my laptop anyway (Ubuntu 14.0.4), xapian gets mad when search terms are greater than 245 chars (or something) when indexing. So I created a custom field that would simply omit terms greater than 64 chars and used this field everywhere I previously used a CharField. Secondly, the custom search form was broken now. Something changed in the Xapian backend and exact searches stopped working. Fortunately the auto_query (which I was using originally and broke during an upgrade) started working again. So I cut the search form back over to doing an auto_query. I kept the form the same (3 fields) because I didn't want to change the form and I think it's better that way.

"""Models for the antispam application."""
from django.db import models
from django.core.cache import cache

from antispam import SPAM_PHRASE_KEY


class SpamPhrase(models.Model):
    """A SpamPhrase is a string that is checked for in user input. User input
    containing a SpamPhrase should be blocked and flagged.
    """
    phrase = models.CharField(max_length=64)

    class Meta:
        ordering = ('phrase', )

    def __unicode__(self):
        return self.phrase

    def save(self, *args, **kwargs):
        cache.delete(SPAM_PHRASE_KEY)
        self.phrase = self.phrase.lower()
        super(SpamPhrase, self).save(*args, **kwargs)