I would alter user input in the clean methods. https://docs.djangoproject.com/en/2.0/ref/forms/validation/
From: django-users@googlegroups.com [mailto:django-users@googlegroups.com] On Behalf Of clavierpla...@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 Request URL: http://localhost:8000/utils/box-optimization/add-items/115 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' -- You received this message because you are subscribed to the Google Groups "Django users" group. 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