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'
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