Как установить начальное значение на основе текущего экземпляра модели

Question

Я пытаюсь создать форму редактирования для редактирования текущих объектов с помощью Django. У меня возникли проблемы с попыткой получить текущий идентификатор объекта, чтобы установить начальное значение на текущие значения объекта.

Я хочу создать форму редактирования, которая будет показывать текущие данные до того, как пользователь отредактирует поле. Как мне это сделать?

Спасибо.

мой forms.py:

class AddfooditemForm(forms.Form): 
    quantity = forms.CharField(label="Quantity") 
    price_per_pound = forms.CharField(label="price_per_pound") 
    expiration_date = forms.CharField(label="expiration_date") 
    price_per_item = forms.CharField(label="price_per_item") 


class AddNonFooditemForm(forms.Form): 
    quantity = forms.CharField(label="Quantity") 
    price_per_item = forms.CharField(label="price_per_item") 


class EditfooditemForm(ModelForm): 
    quantity = forms.CharField(label="Quantity") 
    price_per_pound = forms.CharField(label="price_per_pound") 
    expiration_date = forms.CharField(label="expiration_date") 
    price_per_item = forms.CharField(label="price_per_item") 

    def __init__(self, *args, **kwargs): 
     super(EditfooditemForm, self).__init__(*args, **kwargs) 
    class Meta: 
     model = tasks 
     fields = ['quantity', 'price_per_item', 'expiration_date', 'price_per_pound'] 


class Edit_non_food_itemForm(ModelForm): 
    quantity = forms.CharField(label="Quantity") 
    price_per_item = forms.CharField(label="price_per_item") 

    def __init__(self, *args, **kwargs): 
     super(Edit_non_food_itemForm, self).__init__(*args, **kwargs) 
    class Meta: 
     model = tasks 
     fields = ['quantity', 'price_per_item'] 

мой views.py:

@csrf_exempt 
def add_item(request): 

    if request.method == 'POST' and 'add_food_form' in request.POST: 
     add_food_form = AddfooditemForm(request.POST) 
     if add_food_form.is_valid(): 
      # Cleaned_data 
      input_type = 'food' 
      quantity = add_food_form.cleaned_data['quantity'] 
      price_per_pound = add_food_form.cleaned_data['price_per_pound'] 
      expiration_date = add_food_form.cleaned_data['expiration_date'] 
      price_per_item = add_food_form.cleaned_data['price_per_item'] 
      foodDict = {'price_per_item': price_per_item, 
         'quantity': quantity, 
         'price_per_pound': price_per_pound, 
         'expiration_date': expiration_date} 
      foodData = pickle.dumps(foodDict) 
      item = items(input_type=input_type, foodData=foodData) 
      item.save() 
     return HttpResponseRedirect(reverse('backup_app.views.items_listing')) 


    if request.method == 'POST' and 'add_non_food_form' in request.POST: 
     add_non_food_form = AddNonFooditemForm(request.POST) 
     if add_non_food_form.is_valid(): 
      # Cleaned_data 
      input_type = 'non_food' 
      quantity = add_non_food_form.cleaned_data['quantity'] 
      price_per_item = add_non_food_form.cleaned_data['price_per_item'] 
      non_foodDict = {'quantity': quantity, 
          'price_per_item': price_per_item} 
      non_foodData = pickle.dumps(non_foodDict) 
      item = items(input_type=input_type, non_foodData=non_foodData) 
      item.save() 
     return HttpResponseRedirect(reverse('backup_app.views.items_listing')) 

    else: 

     'add_food_form': AddfooditemForm() 
     'add_non_food_form': AddNonFooditemForm() 

    return render(request, 'backup_app/items_listing.html', {'add_food_form': add_food_form,'add_non_food_form': add_non_food_form}) 

@csrf_exempt 
def edit_item(request, item_id): 
    item = items.objects.get(id=item_id) 

    if request.method == 'POST' and 'edit_food_form' in request.POST: 
     edit_food_form = EditfooditemForm(request.POST, instance=item) 
     if edit_food_form.is_valid(): 
      print "valid" 
      # Cleaned_data 
      item.input_type = 'food' 
      quantity = edit_food_form.cleaned_data['quantity'] 
      price_per_pound = edit_food_form.cleaned_data['price_per_pound'] 
      expiration_date = edit_food_form.cleaned_data['expiration_date'] 
      price_per_item = edit_food_form.cleaned_data['price_per_item'] 
      foodDict = {'price_per_item': price_per_item, 
         'quantity': quantity, 
         'price_per_pound': price_per_pound, 
         'expiration_date': expiration_date} 
      item.foodData = pickle.dumps(foodDict) 
      item.save() 
     return HttpResponseRedirect(reverse('backup_app.views.items_listing')) 

    if request.method == 'POST' and 'edit_non_food_form' in request.POST: 
     edit_non_food_form = Edit_non_food_itemForm(request.POST, instance=item) 
     if edit_non_food_form.is_valid(): 
      # Cleaned_data 
      item.input_type = 'non_food' 
      quantity = edit_non_food_form.cleaned_data['quantity'] 
      price_per_item = edit_non_food_form.cleaned_data['price_per_item'] 
      non_foodDict = {'quantity': quantity, 
          'price_per_item': price_per_item} 

      item.non_foodData = pickle.dumps(non_foodDict) 
      item.save() 
     return HttpResponseRedirect(reverse('backup_app.views.items_listing')) 
    else: 
     context = { 
      'edit_food_form': EditfooditemForm(instance=item), 
      'edit_non_food_form': Edit_non_food_itemForm(instance=item) 
     } 
    return render(request, 'backup_app/items_listing.html', context) 

Answer 1

Попробуйте что-то вроде этого:

forms.py:

class ChangeForm(forms.ModelForm): 

    class Meta: 
     model = MyModel 
     fields = ['field1', 'field2'] 

    def __init__(self, *args, **kwargs): 
     self.user = kwargs.pop('user') 
     super(ChangeForm, self).__init__(*args, **kwargs) 

views.py:

# To render multiple forms, repeat the process 
def account_settings(request): 
    change_form = ChangeForm(request.POST or None, 
          instance=request.user, user=request.user) 
    change_form_2 = ChangeForm2(request.POST or None) 

    if request.method == 'POST': 
     if change_form.is_valid(): 
      change_form.save() 
     if change_form_2.is_valid(): 
      change_form_2.save() 

    context = { 
     'change_form': change_form, 
     'change_form_2': change_form_2 
    } 
    return render(request, 'change_form.html', context) 

Это должно дать вам текущие данные.

Примечание. Измените атрибуты в соответствии с вашими потребностями. Если вы разместите свой код, я могу вам помочь в этом. Однако я не знаю, с чем вы работаете, но вышеприведенный должен быть хорошим шаблоном для подражания.

EDIT:

views.py:

@csrf_exempt 
def add_item(request): 
    add_food_form = AddfooditemForm(request.POST or None) 
    add_non_food_form = AddNonFooditemForm(request.POST or None) 

    if request.method == 'POST': 
     if add_food_form.is_valid(): 
      input_type = 'food' 
      quantity = add_food_form.cleaned_data['quantity'] 
      price_per_pound = add_food_form.cleaned_data['price_per_pound'] 
      expiration_date = add_food_form.cleaned_data['expiration_date'] 
      price_per_item = add_food_form.cleaned_data['price_per_item'] 
      foodDict = {'price_per_item': price_per_item, 
         'quantity': quantity, 
         'price_per_pound': price_per_pound, 
         'expiration_date': expiration_date} 
      foodData = pickle.dumps(foodDict) 
      item = items(input_type=input_type, foodData=foodData) 

     if add_non_food_form.is_valid(): 
      input_type = 'non_food' 
      quantity = add_non_food_form.cleaned_data['quantity'] 
      price_per_item = add_non_food_form.cleaned_data['price_per_item'] 
      non_foodDict = {'quantity': quantity, 
          'price_per_item': price_per_item} 
      non_foodData = pickle.dumps(non_foodDict) 
      item = items(input_type=input_type, non_foodData=non_foodData) 

     item.save() 

     # This needs to be a url name 
     return HttpResponseRedirect(reverse('url_name_here')) 

    context = { 
     'add_food_form': add_food_form, 
     'add_non_food_form': add_non_food_form 
    } 

    # Make this its own template 
    return render(request, 'backup_app/items_add.html', context) 


@csrf_exempt 
def edit_item(request, item_id): 
    item = items.objects.get(id=item_id) 
    edit_food_form = EditfooditemForm(request.POST or None, 
             instance=item) 
    edit_non_food_form = Edit_non_food_itemForm(request.POST or None, 
               instance=item) 

    if request.method == 'POST': 
     if edit_food_form.is_valid(): 
      item.input_type = 'food' 
      quantity = edit_food_form.cleaned_data['quantity'] 
      price_per_pound = edit_food_form.cleaned_data['price_per_pound'] 
      expiration_date = edit_food_form.cleaned_data['expiration_date'] 
      price_per_item = edit_food_form.cleaned_data['price_per_item'] 
      foodDict = {'price_per_item': price_per_item, 
         'quantity': quantity, 
         'price_per_pound': price_per_pound, 
         'expiration_date': expiration_date} 
      item.foodData = pickle.dumps(foodDict) 

     if edit_non_food_form.is_valid(): 
      item.input_type = 'non_food' 
      quantity = edit_non_food_form.cleaned_data['quantity'] 
      price_per_item = edit_non_food_form.cleaned_data['price_per_item'] 
      non_foodDict = {'quantity': quantity, 
          'price_per_item': price_per_item} 

      item.non_foodData = pickle.dumps(non_foodDict) 

     item.save() 

     # This needs to be a url name 
     return HttpResponseRedirect(reverse('url_name_here')) 
    else: 
     context = { 
      'edit_food_form': EditfooditemForm(instance=item), 
      'edit_non_food_form': Edit_non_food_itemForm(instance=item) 
     } 

    # Make this its own template 
    return render(request, 'backup_app/items_edit.html', context) 


def items_listing(request): 
    # Any data you want to post about the listed items 
    return render(request, 'backup_app/items_listing.html', {})