Данные не показаны в базе данных BOTH и на веб-странице

Здравствуйте, я делаю CRUD проект покупок на основе моделей Products, categories, sub categories, size, colors.I currently doing CRUD of SUBcategories which is connected to categories through foreign key.

Я пытаюсь вставить данные на веб-страницу и в базу данных, но они не приходят ниже приведена модель подкатегорий

class SUBCategories(models.Model):
    category_name = models.ForeignKey(Categories,on_delete=models.CASCADE)
    sub_categories_name = models.CharField(max_length=20)
    sub_categories_description = models.CharField(max_length=20)
    isactive = models.BooleanField(default=True)

    def __str__(self):
        return self.categories_name 

ниже представлены функции показа и вставки подкатегорий

def show_sub_categories(request):
    showsubcategories = SUBCategories.objects.filter(isactive=True)
    #print(showsubcategories)
    serializer = SUBCategoriesSerializer(showsubcategories,many=True)
    print(serializer.data)
    return render(request,'polls/show_sub_categories.html',{"data":serializer.data})

def insert_sub_categories(request):
    if request.method == "POST":
        insertsubcategories = {}
        insertsubcategories['sub_categories_name']=request.POST.get('sub_categories_name')
        insertsubcategories['sub_categories_description']=request.POST.get('sub_categories_description')
        form = SUBCategoriesSerializer(data=insertsubcategories)
        
        if form.is_valid():
            form.save()
            print("hkjk",form.data)
            messages.success(request,'Record Updated Successfully...!:)')
            print(form.errors)
            return redirect('sub_categories:show_sub_categories')
        else:
            category_dict = Categories.objects.filter(isactive=True)
            category = CategoriesSerializer(category_dict,many=True)
            hm = {'context': category.data}
            print(hm)
            # print(form.errors)
            return render(request,'polls/insert_sub_categories.html',hm)

    else:
        category_dict = Categories.objects.filter(isactive=True)
        category = CategoriesSerializer(category_dict,many=True)
        hm = {'context': category.data}
        print(hm)
        return render(request,'polls/insert_sub_categories.html',hm)

ниже показаны страницы показа и вставки подкатегорий

{% for result in data %}
      <tbody>
        <tr>
          <td><b>{{result.sub_categories_name}}</b></td>
          <td><b>{{result.sub_categories_description}}</b></td>
          <td style="position: relative;left:50px;">
            <a href="sub_categories/edit_sub_categories/{{result.id}}">
              <button class="btn btn-primary">
                <i class="fa-solid fa-pen-to-square">EDIT</i>
              </button>
            </a>
          </td>
          <td>
            <a href="{% url 'sub_categories:delete_sub_categories' result.id %}" onclick="return confirm('Are You Sure you want to delete?')">
              <button class="btn btn-danger">
                <i class="fa-solid fa-trash">DELETE</i>
              </button>
            </a>
          </td>
        </tr>
      </tbody>
      {% endfor %}

<tr>
                        <td>category name</td>
                        <td>
                            <select name="category_name" id="">
                                {% for c in context %}
                                   <option value="{{c.category_name}}">{{c.category_name}}</option>
                                {% endfor %}
                            </select>
                        </td>
                    </tr>
                    <tr>
                        <td>sub categories Name</td>
                        <td>
                            <input type="text" name="sub_categories_name" placeholder="sub categories ">
                        </td>
                    </tr>
                    <tr>
                        <td>Sub categories Description</td>
                        <td>
                            <textarea name="sub_categories_description" id="" cols="30" rows="10">

                            </textarea>
                        </td>
                    </tr>

данные не поступают ни в базу данных, ни на веб-страницу, любая помощь приветствуется, спасибо

def insert_sub_categories(request):
        if request.method == "POST":
            insertsubcategories = {}
            
    insertsubcategories['category_name']=request.POST.get('category_name')
    insertsubcategories['sub_categories_name']=request.POST.get('sub_categories_name')
    insertsubcategories['sub_categories_description'] = request.POST.get('sub_categories_description')
    
    .
    .
    .