Django：参考数据库条目

Question

I wanna set to the user a background profile image. But instead of letting him place any image, I'll give some pics to let him choose. So I first was storing the images URLs in the Django code, and insert them directly into the database. But I think is more practical to store in a database all the images urls I want with their name, and then reference back into the database the image name.

So I have:

class BackgroundImage(models.Model):
    url = models.PositiveSmallIntegerField()
    name = models.CharField(max_length=25)

class User(models.Model):
    ...
    bgpic = <here it goes the code>

How can I reference a database entry of this model into my user URL profile?

Answer 1

I think you are looking to add a foreign key reference on the User table to the BackgroundImage table

class BackgroundImage(models.Model):
    url = models.PositiveSmallIntegerField()
    name = models.CharField(max_length=25)

class User(models.Model):
    ...
    bgpic = models.ForeignKey(BackgroundImage)

Then you will be able to set a references and access the values of the row attached via foreign key:

user = User.objects.get(id=1)

# set the fk reference
user.bgpic = BackgroundImage.objects.get(id=2)
user.save()

# access the reference  
print user.bgpic.url
print user.bgpic.name