How to handle the URL

I want to build a gallery which connects to different photo sets.
I have been completed the gallery main page, however, I meet two
problems:
1) Use title name of cover image as the URL of photo page, but if the
name include blank, then The URL is not complete. For example: the
cover image named summer days, however ,only shows summer on the URL.

2)How to build the dynamic URL connecting to each photo sets?

the models as below:

class Item(models.Model):
name = models.CharField(max_length=250)
description = models.TextField()

class Meta:
ordering = ["name"]

def __unicode__(self):
return self.name

def get_cover_photo(self):
if self.photo_set.all().count() > 0:
return self.photo_set.all()[0].image
else:
return None

class Photo(models.Model):
item = models.ForeignKey(Item)
title = models.CharField(max_length=100)
image = models.ImageField(uplo

Thanks!!

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