How would you enforce a unique column constraint on a combination of
fields?
For example, say I have the model:
class Company(models.Model):
name = models.CharField(unique=True)
class Article(models.Model):
company = models.ForeignKey(Company)
title = models.CharField(max_length=500)
In the Article model, I'd want to make the combination of company
+title unique. In other words, one Company could be associated with
many Articles, and one Article title could be associated with many
Comanies, but no one company should be associated with the same
Article title more than once. Is that possible?
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