[Aamu Padi]

How to make a model with a yes/no field, if yes that particular object (image) will be used as the background, and no other image will be selected.

I have come with this model:

    class BackgroundImage(models.Model):
        user = models.ForeignKey(user)
        caption = models.CharField(max_length=200)
        image = models.ImageField(upload_to=get_upload_file_name)
        using_image = models.BooleanField()

But with this I can select all of them, and not only one.

Lets take an example of profile picture. A user can have many images, but he can only select one as a profile picture. So, that if he selects one, the other will be un-select itself.
Hope everybody understood what I mean. Please ask me if didn't understood. Also please correct me if my model is not correct. Thank you!

[Lee Hinde]

I recently needed a similar thing (one item out of a table being _the_ thing) and decided that host table was the wrong place to store it. It needs to be in the other table, in this case, your user table should have a field that is the key of the profile picture.

[Aamu Padi]

Thank you for the reply Lee. But could please elaborate a little more. :)

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[Lee Hinde]

You want there to be only one BackgroundImage record marked as 'using_image' for a given user. I'm saying you should add a field to your User table that tracks their BackgroundImage.

[Rafael E. Ferrero]

I think that if u take a background image like a User Property then u must to extend User Model then make a one to one relationship from that to a with backgrounds model. With this your extended user model will have only one field who can take just one value... the ID of a Background Image.

2013/11/3 Lee Hinde <leeh...@gmail.com>

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[Tom Evans]

User can have many images, but only one profile image:

class User:
profile_image = ForeignKey('BackgroundImage', blank=True, null=True)
# other fields

class BackgroundImage:
owner = ForeignKey('User')
# other fields

# get a profile pic
image_url = user.profile_pic and user.profile_pic.image.url or ''

# set a new profile pic
image = BackgroundImage(....)
user.profile_pic = image
user.save()

User can have many images, but only one profile image, without
modifying user model

class User:
# other fields

class BackgroundImage:
owner = ForeignKey('User')
# other fields

class UserBackgroundImage:
user = OneToOneField('User')
profile_picture = ForeignKey('BackgroundImage')

# get a profile pic
image_url = user.userbackgroundimage and
user.backgroundimage.profile_picture.image.url or ''

# set a new profile pic
image = BackgroundImage(....)
user_image, created =
UserBackgroundImage.objects.get_or_create(user=user,
defaults={'profile_picture': image})
if not created:
user_image.profile_picture = image
user_image.save()

Cheers

Tom

[Aamu Padi]

Thank you all for the precious ideas! I made some changes and just about to get the result. :D

Thank you again!

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