django model formset factory如何写{{ form.field }}

Question

所以对于表单，如果您在 forms.py 中有数量 = IntegerField()，那么您可以在 html 文件中编写 {{ form.quantity }} 来获取数量的输入。你怎么能对modelformset_factory做同样的事情？

I've created a formset to ask the user for the item name and quantity. The item name is given by the loop. I need to move the modelformset factory inside the loop for each iteration, but I don't know how

#views.py
    #for showing items
    if (Items.objects.filter(item_category="Produce").exists()):
        produce = Items.objects.filter(item_category="Produce", show=True, quantity__gte=1)
    if (Items.objects.filter(item_category="Grains").exists()):
        grains = Items.objects.filter(item_category="Grains", show=True, quantity__gte=1)
    if (Items.objects.filter(item_category="Protein/Dairy").exists()):
        protein_dairy = Items.objects.filter(item_category="Protein/Dairy", show=True, quantity__gte=1)
    if (Items.objects.filter(item_category="extras").exists()):
        extras = Items.objects.filter(item_category="extra items", show=True, quantity__gte=1)

    
    #playing with formset
    form_extras = Items.objects.filter(show=True).count()
    formset = modelformset_factory(Cart, form=CustomerOrderForm,extra=form_extras)
    form = formset(queryset=Items.objects.none())
    if request.method == 'POST':
        form = formset(request.POST)
        #work on this
        if form.is_valid():
            print("is valid")
            form = formset(request.POST)
            instances = form.save(commit=False)
            for instance in instances:
                #item previously in cart
                if (Cart.objects.filter(username=request.user, item_name=form.cleaned_data.get('item_name')).exists()):
                    cart_instance = Cart.objects.get(username=request.user, item_name=form.cleaned_data.get('item_name'))
                    cart_instance.quantity = cart_instance.quantity + form.cleaned_data.get('quantity')
                    cart_instance.save()
                else:
                    #item never in cart, create new instance
                    item_instance = Items.objects.get(item_name=form.cleaned_data.get('item_name'))

                    Cart.objects.create(username=request.user, item_name=form.cleaned_data.get('item_name'), weight=item_instance.weight, quantity=form.cleaned_data.get('quantity'), description=item_instance.description, image=item_instance.image, price=item_instance.price, storage_type=item_instance.storage_type, item_category=item_instance.item_category, limit=item_instance.limit,)
        
            timestamp = datetime.date.today()
            messages.success(request,"Sucessfully added your items to your cart! " + str(timestamp))
            return redirect('/')
        else:
            print("form not valid for cart")
            form = formset()

    user_produce_points = request.user.profile.produce_points
    user_grain_points = request.user.profile.grain_points
    user_protein_dairy_points = request.user.profile.protein_dairy_points
    user_extras_points = request.user.profile.extra_items_points

主页.html：

#home.html
<form method="POST">
        {% csrf_token %}
        {{ form.management_form }}
        {{form.as_p}} 
        <div class="row">    

          {% for item in produce %}
            <div class="card" style="width: 18rem;">

                <img src="/media/{{ item.image }}" class="card-img-top" alt="...">

                <div class="card-body">
                    <h5 class="card-title text-center">
                        <b>{% if item.storage_type == "Frozen" %}
                              Frozen 
                            {% endif %}
                        {{ item.item_name }} ({{ item.weight }} oz)</b></h5>

                    <h6 class ="card-title text-center" style="color:green;font-size: 16px;"><b>{{ item.price }} Produce 
                      {% if item.price < 2 %}
                      Point
                      {% else %}
                      Points
                      {% endif %}

                    </b></h6>
                    
                    <p class="card-text">{{ item.description }}</p>
                    <br><br>

                
                      <div class="input-quantity">
                      
                        <input type="hidden" name="form-{{forloop.counter}}-item_name" value="{{ item.item_name }}">
                        {{form.quantity}}
                        {{form.item_name}}
                        {{form.field}}

                        Quantity: <input style="max-width:3em;" type="number" name="form-{{forloop.counter}}-quantity" pattern="[0-9]{3}" min="0" max="{{ item.limit }}">
            
                      </div>

                    
                </div>
            </div>
            {% endfor %}
            <br>

            <button type="submit" style="height:38px;" class="btn btn-primary btn-lg sharp" type="button">Add to Cart</button>
              </form>

Answer 1

Django Docs 总是有一个很好的例子，它总是对我有帮助。

遗憾的是，您没有发布（我假设您没有发布）视图函数的其余部分，所以我只能猜测模板中的 form 指的是在视图中创建的表单集，并且被传递.如果是这样，您需要先创建 for 循环，然后才能在 name="form-{{forloop.counter}}-item_name" 中访问它。你可以这样创建它：

{% for form_line in form %}
    <!--form_line rendering you have-->
    <p>Form #{{ forloop.counter }}</p>
    {{ form_line.quantity }}
    {{ form_line.item_name }}
    {{ form_line.field }}
{% endfor %}

在您的模板中，您还拥有produce 变量。我不确定那指的是什么，也许是因为我看不到整个视图功能。