title: Django One-To-Many Models
body: <p>The following models describe a vulnerability and the URLs out on the internet that reference that vulnerability. Assume that each URL only ever talks about 1 vulnerability, and that many URLs will discuss that vulnerability. Is this the correct way to lay out the model?</p>
  
  <pre><code>class Vuln(models.Model):
    pub_date = models.DateTimeField("Publication Date")
    short_description = models.CharField("Description", max_length=70)
  
    reference_urls = models.ForeignKey(Url, unique=True, blank=True, verbose_name="Reference URLs")
    vendor = models.ForeignKey(Vendor, verbose_name="Vendor")
  
  class Url(models.Model):
    url = models.URLField("URL", max_length=200)
  </code></pre>
  
  <p>The Admin application gives a 'select' box for the reference URLs, which isn't what I want. When I add a new vulnerability object, all of the existing URLs that have been entered show up in that dropdown, which is again unnatural. I feel like this should behave very similar to how a blog comment would, ie. the comment applies to a single blog entry and none other and that one blog entry may have many comments. How do I express this in a Django model?</p>