django JSONField doesn't accept value

Question

I add a JSONField for one of my models. I want to create an instance of that model in admin panel but that JSONField returns a validation error (Enter a valid JSON.)

how I can fix this??

model:

class Product(models.Model):
    category = models.ManyToManyField(Category, related_name='products')
    name = models.CharField(max_length=500)
    slug = models.SlugField(max_length=500, allow_unicode=True, unique=True)
    image_1 = models.ImageField(upload_to='products_pic/%Y/%m/%d/', null=True, blank=True)
    description = models.TextField(null=True, blank=True)
    attribute = models.JSONField(default={})
    price = models.PositiveIntegerField()
    discount = models.PositiveIntegerField(null=True, blank=True)
    available = models.BooleanField(default=True)
    popular = models.BooleanField(default=False)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    comments = GenericRelation(Comment)

    class Meta:
        ordering = ('-created',)

    def __str__(self):
        return self.name

I add products in admin panel. I want to have multiple attributes for my products like color , size and ... . is it true to use json fiels for that??

this is the error:

You should set `default=dict` not `default={}`, unless you want to share dictionary between all created instances of the same worker. You probably want a new dict each time, which is what `dict` will return when called with no args. — run_the_race, Sep 13 '22 at 10:33

Willem Van Onsem · Accepted Answer · 2021-01-01T22:59:38.180

7

This is not valid JSON. The strings in JSON are wrapped with double quotes. Indeed, you can verify this for example with JSONLint.com. It is a valid Python dictionary, but not valid JSON.

You thus should enter:

{ "key": "value" }

For more information, see the JSON specifications.

I add products in admin panel. I want to have multiple attributes for my products like color , size and ... . is it true to use json fiels for that??

If the fields are fixed (are attributes of all Products), then you should use individual fields, since that is more convenient to fielter, make forms, etc. If the data is more dynamic, it is often better to make use of a JSON field.

edited Jan 01 '21 at 22:59

answered Jan 01 '21 at 22:52

Willem Van Onsem

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oh thank you. i edited my question and asked an important thing about json field usage in my project. please answer that. – hossein-shahsavan Jan 01 '21 at 22:58
i created a product but the attribute field doesn't shown in out put api. what is the reason?? – hossein-shahsavan Jan 01 '21 at 22:59
@hossein-shahsavan: likely you did not properly serialize it... – Willem Van Onsem Jan 01 '21 at 23:01
yes i forgot to add that field to serializer. thank you. – hossein-shahsavan Jan 01 '21 at 23:04
@Williem Van Onsem . could you please take a look at me new question?? https://stackoverflow.com/questions/65984415/programmingerror-at-admin-order-order-relation-order-order-does-not-exist-li – hossein-shahsavan Jan 31 '21 at 21:52

django JSONField doesn't accept value

1 Answers1