Re:

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

Thank you again!

On Mon, Nov 4, 2013 at 6:22 PM, Tom Evans <tevans.uk@googlemail.com> wrote:

On Sun, Nov 3, 2013 at 8:23 PM, Aamu Padi <aamupadi@gmail.com> wrote:
> 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!
>

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

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