How to save from html select to sql in django - django

Question

I want to save from HTML select to SQL but "Cannot assign "'27'": "UserProduct.category" must be a "Category" instance." I get an error. What am I doing wrong?
sell.html
<div class="form-group">
<p>Yerləşdirdiyiniz məhsul "İkinci əl məhsullar" kateqoriyasında görünəcək.</p>
<select class="input search-categories" name="up_category">
<option value="0">Kateqoriya seç</option>
{% for category in category %}
{% if category.active %}
{% if category.parent_id %}
<option value="{{category.id}}">{{category.name}}</option>
{% else %}
<option value="{{category.id}}" style="font-weight: bold;">{{category.name}}</option>
{% endif %}
{% endif %}
{% endfor %}
</select>
</div>
views.py
def sell(request):
category = Category.objects.all()
context = {'category': category}
if request.POST:
product_name = request.POST.get('product_name')
up_category = request.POST.get('up_category')
keywords = request.POST.get('keywords')
descriptions = request.POST.get('descriptions')
main_image = request.POST.get('main_image')
price = request.POST.get('price')
detail = request.POST.get('detail')
image1 = request.POST.get('image1')
image2 = request.POST.get('image2')
image3 = request.POST.get('image3')
if product_name == '' or up_category == 'Kateqoriya seç' or keywords == '' or descriptions == '' or price == '' or price == str or detail == '':
messages.warning(request, 'Bütün xanaları doldurduğunuzdan əmin olun!')
else:
newUserProduct = UserProduct(user=request.user,
name=product_name,
category=up_category,
keywords=keywords,
descriptions=descriptions,
detail=detail,
main_image=main_image,
image1 = image1,
image2 = image2,
image3 =image3
)
newUserProduct.save()
messages.warning(request, 'Məhsulunuz satışa çıxdı.')
return render(request, 'forms/sell.html', context)
return render(request, 'forms/sell.html', context)
models.py
class UserProduct(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE, default=False)
name = models.CharField(max_length=100)
category = models.ForeignKey(Category, on_delete=models.DO_NOTHING)
main_image = models.ImageField(upload_to='static/product_images/%Y/%m/%d/')
detail = models.TextField()
keywords = models.CharField(max_length=50)
description = models.CharField(max_length=1000)
price = models.FloatField()
sale = models.IntegerField(blank=True, null=True, verbose_name="Sale (%)")
image1 = models.ImageField(upload_to='static/product_images/%Y/%m/%d/', blank=True, null=True)
image2 = models.ImageField(upload_to='static/product_images/%Y/%m/%d/', blank=True, null=True)
image3 = models.ImageField(upload_to='static/product_images/%Y/%m/%d/', blank=True, null=True)
date_created = models.DateTimeField(auto_now_add=True)
I want to save from HTML select to SQL but "Cannot assign "'27'": "UserProduct.category" must be a "Category" instance." I get an error. What am I doing wrong?

Answer 1

In your UserProduct class, the field category is a ForeignKey to the Category class. Try getting the Category first from your request.POST, then adding it:
def sell(request):
category = Category.objects.all()
context = {'category': category}
if request.POST:
product_name = request.POST.get('product_name')
up_category = request.POST.get('up_category')
keywords = request.POST.get('keywords')
descriptions = request.POST.get('descriptions')
main_image = request.POST.get('main_image')
price = request.POST.get('price')
detail = request.POST.get('detail')
image1 = request.POST.get('image1')
image2 = request.POST.get('image2')
image3 = request.POST.get('image3')
if product_name == '' or up_category == 'Kateqoriya seç' or keywords == '' or descriptions == '' or price == '' or price == str or detail == '':
messages.warning(request, 'Bütün xanaları doldurduğunuzdan əmin olun!')
else:
cat = Category.objects.get(pk=up_category) # CHANGED
newUserProduct = UserProduct(user=request.user,
name=product_name,
category=cat, # CHANGED
keywords=keywords,
descriptions=descriptions,
detail=detail,
main_image=main_image,
image1 = image1,
image2 = image2,
image3 =image3
)
newUserProduct.save()
messages.warning(request, 'Məhsulunuz satışa çıxdı.')
return render(request, 'forms/sell.html', context)
return render(request, 'forms/sell.html', context)