Django Model form not saving items to database

Model

class Products(models.Model):

    UNIT = (
        ('whole', 'whole unit'),
        ('item', 'per single item'),
    )


    # category = models.ForeignKey(Category, related_name='products', on_delete=models.CASCADE)
    ProductName = models.CharField(max_length=255)
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    ProductDescription = models.TextField(max_length=500, blank=True)
    price = models.FloatField()
    location = models.CharField(choices = COUNTIES, max_length=300)
    # category = models.CharField( choices = CATEGORIES, max_length=10, default='other')
    category = models.ForeignKey(Category, related_name='products', on_delete=models.CASCADE)

    unitofsale = models.CharField(max_length=10, choices=UNIT)
    image = models.FileField(upload_to='products_images/', blank=True)
    sublocation = models.CharField(max_length=100)
    created= models.DateTimeField(auto_now_add=True)
    # slug = models.SlugField(max_length=200,db_index=True)

    class Meta:
        ordering = ('-created',)
        # index_together = (('id', 'slug'),)

template

        <form method="POST" action="{% url  'sell' %}" enctype="multipart/form-data">
            {% csrf_token %}
            <div class="row col-md-10">
                <div class="col-md-6">
                    <div class="form-group">
                        <label>Product Name</label>
                        {{  form.ProductName}}

                    </div>


                </div>
                <div class="col-md-6">
                    <div class="form-group">
                        <label>Product Price</label>
                        {{ form.price }}
                    </div>
                    </div>
                </div>
                        <div class="row col-md-10">
                <div class="col-md-6">
                    <div class="form-group">
                        <label>County</label>
                        {{  form.location}}

                    </div>


                </div>
                <div class="col-md-6">
                    <div class="form-group">
                        <label>Sub-location</label>
                        {{ form.sublocation }}
                    </div>
                    </div>
                </div>
                        <div class="row col-md-10">
                <div class="col-md-6">
                    <div class="form-group">
                        <label>Category</label>
                        {{  form.category}}

                    </div>


                </div>
                <div class="col-md-6">
                    <div class="form-group">
                        <label>Unit of Sale</label>
                        {{ form.unitofsale }}
                    </div>
                    </div>
                </div>
                        <div class="row col-md-10">
                <div class="col-md-6">
                    <div class="form-group">
                        <label>Product Description</label>
                        {{  form.ProductDescription}}

                    </div>


                </div>
                <div class="col-md-6">
                    <div class="form-group">
                        <label>Upload Product Image</label>
                        {{ form.image }}
                    </div>
                    </div>
                </div>
                        <div class="row col-md-10">
                <div class="col-md-6">
                    <div class="form-group">
                                <button type="submit" class="btn btn-success btn-lg mt-5"> Sell </button>

                    </div>


                </div>
                </div>


            <br>

{#            <input type="submit" value="Sell">#}
        </form>
view 
def sell(request):
     if request.method == 'POST':
          form = ProductsForm()
          form = ProductsForm(request.POST, request.FILES, instance = request.user)
          if form.is_valid():
              print('form is valid')
              form = form.save(commit=True)
              user = request.user
              form.user = user
              form.save()
              return redirect('home')

     else:
         form = ProductsForm()
         return render(request, 'sell/products_form.html', {'form': form})

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