Here's some code that I wrote a few days ago:
class MyModel(models.Model):
#various fields and stuff here
def save(self, *args, **kwargs):
if not self.slug:
self.slug = self.make_slug()
super(Project, self).save(*args, **kwargs)
def make_slug(self):
""" Create a (unique) slug from self.name. """
sanitized = re.sub("(?i)[^a-z0-9_-]", "_", self.name).lower()
#remove non-alpha-numeric-underscore-hyphen chars
sanitized = re.sub("^_|_$", "", sanitized) #remove underscores
from start/end cos they look dumb
while(re.search("__", sanitized)): #remove double underscores
cos they look dumb
sanitized = re.sub("__", "_", sanitized)
#now make sure that it's unique:
while(Project.objects.filter(slug__iexact=sanitized).count()):
#if it's not unique
current_number_suffix_match = re.search("\d+$", sanitized)
#get the current number suffix if there is one
current_number_suffix = current_number_suffix_match and
current_number_suffix_match.group() or 0
next = str(int(current_number_suffix) +1) #increment it,
and turn back to string so re.sub doesn't die
sanitized = re.sub("(\d+)?$", next, sanitized) #replace
current number suffix with incremented suffix, try again...
return sanitized
That should do exactly what you're after.
Adam Alton
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