Monday, July 16, 2018

Re: help with get_form_kwargs

I would actually prefer to override clean(), but CreateView doesn't appear to have a clean() method that I can override. I did make a ModelForm to use with the CreateView, but the clean_item method I defined there never gets called--breakpoints and print statements are all skipped, so I don't even have any stack trace information because nothing actually breaks. I've looked through the source code and I still don't see how CreateView cleans its data. 

class AddItem(forms.ModelForm):

    class Meta:
        model = ItemsTestCollection
        fields = ['item', 'qty', 'case']

    def clean_item(self):
        print("will it print anything?")
        # Answer: nope, didn't print anything.
        item_num = self.cleaned_data['item']
        actual_item = Item.objects.get(item_number=item_num)
        return actual_item.id

I'm sure I've overlooked something simple, but meanwhile I'm looking for any kind of workaround. But thank you for the suggestion! I wish I knew how to implement it. 

On Monday, July 16, 2018 at 11:46:39 AM UTC-4, Matthew Pava wrote:

I would alter user input in the clean methods.

https://docs.djangoproject.com/en/2.0/ref/forms/validation/

 

 

From: django...@googlegroups.com [mailto:django...@googlegroups.com] On Behalf Of clavie...@gmail.com
Sent: Monday, July 16, 2018 10:28 AM
To: Django users
Subject: help with get_form_kwargs

 

I have a CreateView in which I need to alter the user input. I may have found a way to do so using get_form_kwargs, but I'm puzzled by a couple of things:

 

I know that kwargs['data'] is a QueryDict, which is immutable. So I tried the doc's QueryDict.copy() recommendation: 

def get_form_kwargs(self):
    kwargs = super().get_form_kwargs()
    clone = kwargs['data'].copy()
    # clone = copy(kwargs['data'])
    item_num = clone['item']
    actual_item = Item.objects.get(item_number=item_num)
    clone['item'] = str(actual_item.id)
    # data.update({'item': actual_item})
    kwargs['data'] = clone
    return kwargs

 

It appears to work just fine until the return statement. I can step through every line and see the values change exactly the way I want them to change. By the time I get to the return statement, `clone`--which is a copy of kwargs['data']--is a QueryDict that contains the correct information. However, the program crashes with a KeyError after `kwargs` is returned, saying that kwargs['data'] doesn't exist. In the following stack trace, line 62 is the second line of the method (clone = kwargs['data'].copy()). 

 

KeyError at /utils/box-optimization/add-items/115

'data'

Request Method:

GET

Request URL:

http://localhost:8000/utils/box-optimization/add-items/115

Django Version:

2.0.5

Exception Type:

KeyError

Exception Value:

 
'data'

Exception Location:

C:\WMS Repository\Warehouse Management System\utils\views.py in get_form_kwargs, line 62

Python Executable:

C:\miniconda3\envs\django\python.exe

Python Version:

3.6.5

Python Path:

 
['C:\\WMS Repository\\Warehouse Management System',
 'C:\\Program Files\\JetBrains\\PyCharm 2017.3.3\\helpers\\pydev',
 'C:\\WMS Repository\\Warehouse Management System',
 'C:\\Program Files\\JetBrains\\PyCharm 2017.3.3\\helpers\\pydev',
 'C:\\Users\\heast\\.PyCharm2018.1\\system\\cythonExtensions',
 'C:\\miniconda3\\envs\\django\\python36.zip',
 'C:\\miniconda3\\envs\\django\\DLLs',
 'C:\\miniconda3\\envs\\django\\lib',
 'C:\\miniconda3\\envs\\django',
 'C:\\Users\\heast\\AppData\\Roaming\\Python\\Python36\\site-packages',
 'C:\\miniconda3\\envs\\django\\lib\\site-packages',
 'C:\\Program Files\\JetBrains\\PyCharm '
 '2017.3.3\\helpers\\pycharm_matplotlib_backend']

Server time:

Mon, 16 Jul 2018 11:16:38 -0400

Environment:

 

 

Request Method: GET

 

Django Version: 2.0.5

Python Version: 3.6.5

Installed Applications:

['item.apps.ItemConfig',

 'inventory.apps.InventoryConfig',

 'fulfillment.apps.FulfillmentConfig',

 'manifest.apps.ManifestConfig',

 'order.apps.OrderConfig',

 'utils.apps.UtilsConfig',

 'django.contrib.admin',

 'django.contrib.auth',

 'django.contrib.contenttypes',

 'django.contrib.sessions',

 'django.contrib.messages',

 'django.contrib.staticfiles']

Installed Middleware:

['django.middleware.security.SecurityMiddleware',

 'django.contrib.sessions.middleware.SessionMiddleware',

 'django.middleware.common.CommonMiddleware',

 'django.middleware.csrf.CsrfViewMiddleware',

 'django.contrib.auth.middleware.AuthenticationMiddleware',

 'django.contrib.messages.middleware.MessageMiddleware',

 'django.middleware.clickjacking.XFrameOptionsMiddleware']

 

 

 

Traceback:

 

File "C:\miniconda3\envs\django\lib\site-packages\django\core\handlers\exception.py" in inner

  35.             response = get_response(request)

 

File "C:\miniconda3\envs\django\lib\site-packages\django\core\handlers\base.py" in _get_response

  128.                 response = self.process_exception_by_middleware(e, request)

 

File "C:\miniconda3\envs\django\lib\site-packages\django\core\handlers\base.py" in _get_response

  126.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

 

File "C:\miniconda3\envs\django\lib\site-packages\django\views\generic\base.py" in view

  69.             return self.dispatch(request, *args, **kwargs)

 

File "C:\miniconda3\envs\django\lib\site-packages\django\views\generic\base.py" in dispatch

  89.         return handler(request, *args, **kwargs)

 

File "C:\miniconda3\envs\django\lib\site-packages\django\views\generic\edit.py" in get

  168.         return super().get(request, *args, **kwargs)

 

File "C:\miniconda3\envs\django\lib\site-packages\django\views\generic\edit.py" in get

  133.         return self.render_to_response(self.get_context_data())

 

File "C:\WMS Repository\Warehouse Management System\utils\views.py" in get_context_data

  93.         context = super().get_context_data()

 

File "C:\miniconda3\envs\django\lib\site-packages\django\views\generic\edit.py" in get_context_data

  66.             kwargs['form'] = self.get_form()

 

File "C:\miniconda3\envs\django\lib\site-packages\django\views\generic\edit.py" in get_form

  33.         return form_class(**self.get_form_kwargs())

 

File "C:\WMS Repository\Warehouse Management System\utils\views.py" in get_form_kwargs

  62.         clone = kwargs['data'].copy()

 

Exception Type: KeyError at /utils/box-optimization/add-items/115

Exception Value: 'data'

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