hi mates trouble with ajax 500 error server

Im receiving a 500 server error,  when I trying  to obtain data wiith ajax from my model. 

 My details are as follows:

Model:

class Item(models.Model):
    """Items Product model"""
    operation = models.ForeignKey(Operation, on_delete=models.CASCADE)
    brand = models.ForeignKey(Brand, on_delete=models.CASCADE)
    subcategory = models.ForeignKey(SubcategoryItem, on_delete=models.CASCADE)
    categ = models.ForeignKey(CategItem, on_delete=models.CASCADE)
    section = models.ForeignKey(Section, on_delete=models.CASCADE)
    currency = models.ForeignKey(Currency, on_delete=models.CASCADE)
    item_name = models.CharField(max_length=255, verbose_name='item')
    item_description = models.TextField(null=True)
    item_SKU = models.CharField(max_length=100, null=False, blank=True)
    ean = models.CharField(max_length=100, unique=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    status = models.CharField(max_length=100, null=True)
    is_active = models.BooleanField()
    price = models.PositiveIntegerField(null=True)
    purchase_price = models.PositiveIntegerField(null=True, blank=True)
    tax = models.PositiveIntegerField(null=True)
    color = models.CharField(max_length=30, null=True)
    size = models.CharField(max_length=3, null=True, blank=True)
    weight = models.CharField(max_length=5, null=True, blank=True)
    height = models.CharField(max_length=5, null=True, blank=True)

    image = models.ImageField(
        upload_to='backoffice/static/images',
        blank=True,
        null=True
    )
    image_1 = models.ImageField(
        upload_to='backoffice/static/images',
        blank=True,
        null=True
    )
    image_2 = models.ImageField(
        upload_to='backoffice/static/images',
        blank=True,
        null=True
    )
    image_3 = models.ImageField(
        upload_to='backoffice/static/images',
        blank=True,
        null=True
    )
    image_4 = models.ImageField(
        upload_to='backoffice/static/images',
        blank=True,
        null=True
    )
    image_5 = models.ImageField(
        upload_to='backoffice/static/images',
        blank=True,
        null=True
    )

    class Meta:
        ordering = ('item_name',)

    def __str__(self):
        return self.item_name

    def toJson(self):
        item = model_to_dict(self)
        item['item_name'] = self.item_name.toJson()
        item['item_description'] = self.item_description.toJson()
        item['item_SKU'] = self.item_SKU.toJson()
        item['operation'] = self.operation.toJson()
        item['brand'] = self.brand.toJson()
        item['subcategory'] = self.subcategory.toJson()
        item['categ'] = self.categ.toJson()
        item['section'] = self.section.toJson()
        item['price'] = format(self.price, '.2f')
        item['purchase_price'] = format(self.purchase_price, '.2f')
        item['tax'] = format(self.tax, '.2f')
        item['weight'] = format(self.weight, '.2f')
        item['height'] = format(self.height, '.2f')
        return item
   
    def get_absolute_url(self):
        return reverse('all_items.html', kwargs={'pk':self.id})

HTML :

<div class="input-group mb-3 col-md-8">
                    <span class="input-group-append">
                      <button  type="button" class="btn btn-danger"><i class="fa fa-search" style="color:#fff" ></i>
                      </button>
                    </span>
                      <input type="text"  id="search_box" name="search_box" class="form-control" value="" placeholder="Find the items you need add to invoice">
                  </div>

Ajax

$('#search_box').autocomplete({
source:function(request, response){
alert(request.term);

$.ajax({
url:window.location.pathname,
type: 'POST',
data: {
'action':'search_item',
'term': request.term
},
dataType:'json',
        }).done(function(data){
        response(data);
            alert('hola');
        }).fail(function (jqXHR,textStatus, errorTrown){
        alert( errorTrown);
        }).always(function(data){

        });

},
delay: 500,
minLength: 1,
select: function(event, ui){
console.log(ui.item);

}
});

Sold.py View

#Creating an invoice instance

class SoldCreate(LoginRequiredMixin, CreateView):

    model = Sold

    form_class = SoldForm

    template_name = 'solds/add_invoice.html'

    def get_context_data(self, **kwargs):

        context = super().get_context_data(**kwargs)

        context['tittle'] = 'Sold Forms'

        context['table_tittle'] = 'New sold'

        context['table_subtittle'] = 'Add here your new solds'

        return context

    

    @method_decorator(csrf_exempt)

    def dispatch(self, *args, **kwargs):

        return super().dispatch(*args, **kwargs)

    

    @method_decorator(csrf_exempt)

    def post(self, request, *args,**kwargs):

        data={}

        try:

            action == request.POST['action']

            if action == 'search_item':

                data = []

            

                prods = Item.objects.filter(name__icontains=request.POST['term'])

              

                for i in prods:

                    item = i.item_description

                    item['value'] = i.item_name

                    data.append(item)

            else:

                data['error']='no ha ingresado una opcion'

        except Exception as e:

            data['error'] = str(e)

    

        return JsonResponse(data, safe=False)

        

    def get_success_url(self):

        return reverse('all_sold')

Thanks a lot in advance

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