Integrity eror not null constraint failed-CodePudding

Exception Type: IntegrityError

Exception Value:

NOT NULL constraint failed: Cart.cart_id

#mymodel: class Cart(models.Model):

cart_id=models.CharField(max_length=250,blank=True)

def _cart_id(request):

cart=request.session.session_key

if not cart:

    cart=request.session.create()

def add_cart(request,product_id):

product=Product.objects.get(id=product_id)

try:

    cart=Cart.objects.get(cart_id=_cart_id(request))

except Cart.DoesNotExist:

    cart=Cart.objects.create(cart_id=_cart_id(request))

    cart.save()

CodePudding user response：

Replace your Cart model with cart_id=models.CharField(max_length=250,blank=True, null=True)

CodePudding user response：

Your function _cart_id() return nothing and you are using it for getting or creating cart_id.

class Cart(models.Model):          

    cart_id=models.CharField(max_length=250,blank=True)

    def _cart_id(request):
        cart=request.session.session_key
        if not cart:
            cart=request.session.create()
        return cart

    def add_cart(request, product_id):
        product=Product.objects.get(id=product_id)
        try:
            cart=Cart.objects.get(cart_id=_cart_id(request))
        except Cart.DoesNotExist:
            cart=Cart.objects.create(cart_id=_cart_id(request))
        cart.save()