On Sun, 16 Nov 2014 23:51:16 -0800 (PST)
ThomasTheDjangoFan <stefan.eichholz.ber...@googlemail.com> wrote:
> Hi guys,
>
> I'd like to only be able to assign many ProcutImages to a Product, but only
> ONE Image as a default image per product
> (ProductImage.is_default_image=True).
>
> I can't get this to work correnctly on Django 1.7 with a db.sqlite3: With
> the code below I can only assign ONE Image to a Product. After that I get
> the error "Product image with this Product und Is default image already
> exists.".
>
> Am I getting something wrong?
>
> from django.db import models
>
> class Product(models.Model):
> title = models.CharField(max_length=255)
>
> is_active = models.BooleanField(default=True)
>
>
> class ProductImage(models.Model):
> product = models.ForeignKey(Product)
>
> image = models.ImageField(upload_to='products/images/')
>
> is_default_image = models.BooleanField(default=False,null=False,blank=
> False)
>
> class Meta:
> # A product can have multiple ProductImages, but only one of them
> can be the "default"-image
> unique_together = ('product', 'is_default_image')
>
> I would be really thankful for some tips.
Well boolean field can have only two values: "true" or "false".
Now your unique_together defines that for "product" combined with
"is_default_image" must be unique. Which means that for each product you can
have _two_ images, one where is_default_image is true and one where
is_default_image is false. And this is forced on database level as well.
But apparently that is what you intended to do. There isn't really one single
solution for your problem.
--
Jani Tiainen
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