Model to select only 1 object from multiple objects

[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!

[Ruturaj Dhekane]

Your model can work. But I think the model there is an alternate way to create this model.

The way I might design this is have a profile model

Profile = name, birth date, location, favorite books, friends, ProfilePicture (foreignKey)

ProfilePicture = image, caption

So now, you can have multiple profile pictures and the profile will point to that profile picture which needs to be shown. Hope this helps.

To do it the way you are doing - you need to make sure that first all User=X have set using_image=false. Then set the particular used using_image=true. Then you can retrieve the unique photo for every user by filtering on using_image = true This needs to be done in code rather than in model.

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[Aamu Padi]

Thank you. I hope I can walk through now. :)

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