I'm looking for a way to redirect to a different page depending upon which
submit button the user clicks. I included a formaction tag in the template,
but django still demands that get_absolute_url be defined. Using Django 2.0
Basically, I'm trying to write a small app that launches a test case, which
would allow a non-programmer to evaluate a small section of code
responsible for a background process. The app should allow the user to add
as many test items to it as they wish, one at a time. When an item is
added, they can choose to click and 'evaluate' button or an 'add more
items' button, and each button should go to a different page--basically,
'add more items' should refresh the same page. Clicking on 'add more items'
does indeed post the data to the database, but it ignores the formaction
tag. The stack trace says that form_valid is calling get_absolute_url on
the model (which I have not defined), but the target url has to do with
what the user wants to do next with said model, not the model itself. I
haven't figured out how to override the get_absolute_url call based on
which html button was clicked. (Though it also said I can provide an url,
which I did on the template...)
(The code I'm pasting below may be a little awkward because I've been
finding workarounds for things by trial and error; so if anything
particularly egregious catches someone's eye, comments to that end are
welcome.)
Problem view:
class AddItemsToEvaluateCreateView(CreateView, FormMixin):
model = ItemsTestCollection
form_class = EnterItem
template_name = 'utils\evaluate.html'
def get_queryset(self):
return ItemsTestCollection.objects.filter(case_id=self.kwargs['pk'])
def get_object(self, queryset=None):
return EvaluateTestCase.objects.get(pk=self.kwargs['pk'])
def get_context_data(self, **kwargs):
context = super().get_context_data()
context['case_id'] = self.kwargs['pk']
context['items_in_order'] =
ItemsTestCollection.objects.filter(case_id=self.kwargs['pk'])
return context
Problem models:
class ItemsTestCollection(models.Model):
"""An item to be tested in Box Opt."""
item = models.ForeignKey('item.Item', on_delete=models.CASCADE)
qty = models.IntegerField()
case = models.ForeignKey('EvaluateTestCase', on_delete=models.CASCADE)
box = models.ForeignKey('BoxResults', on_delete=models.CASCADE, null=True)
class EvaluateTestCase(models.Model):
"""Individual test cases."""
STATUS = (
('no', 'Something bad happened,'),
('hm', 'Needs improvement.'),
('ok', 'Seems all right.')
)
verdict = models.CharField(max_length=2, choices=STATUS, blank=False,
null=True)
feedback = models.TextField(blank=True, null=True)
def get_absolute_url(self):
return reverse('utils:evaluate', kwargs={'pk': str(self.id)})
@staticmethod
def get_item_lots(case_number: int):
"""Get the first ItemLot for each item in the EvaluateTestCase."""
item_lots: List[ItemLot] = []
for item_collection in
ItemsTestCollection.objects.filter(case_id=case_number):
item_lots.append(ItemLot.objects.filter(item=item_collection.item)[0])
return item_lots
Problem template:
<form method="post">
{% csrf_token %}
<table>
<tr>
<td><label for="item">Item #: </label></td>
<td><input type="text" id="item" name="item" autofocus/></td>
</tr>
<tr>
<td><label for="qty">Qty: </label></td>
<td><input type="text" id="qty" name="qty"/></td>
</tr>
<tr>
<td><label for="case">Case: </label></td>
<td><input type="text" id="case" name="case" value="{{ case_id }}"
style="color:gray" readonly/></td>
</tr>
</table>
<input type="submit" formaction="{% url 'utils:evaluate' case_id %}"
value="Add more items" />
<input type="submit" formaction="{% url 'utils:results' case_id %}"
value="Optimize" />
</form>
Error:
ImproperlyConfigured at /utils/box-optimization/add-items/75
No URL to redirect to. Either provide a url or define a get_absolute_url
method on the Model.
Request Method: POST
Request URL: http://localhost:8000/utils/box-optimization/add-items/75
Django Version: 2.0.5
Exception Type: ImproperlyConfigured
Exception Value:
No URL to redirect to. Either provide a url or define a get_absolute_url
method on the Model.
Exception Location:
C:\miniconda3\envs\django\lib\site-packages\django\views\generic\edit.py
in get_success_url, line 119
Python Executable: C:\miniconda3\envs\django\python.exe
Python Version: 3.6.5
Python Path:
['C:\\WMS Repository\\Warehouse Management System',
'C:\\WMS Repository\\Warehouse Management System',
'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: Thu, 12 Jul 2018 15:47:04 -0400
Environment:
Request Method: POST
Request URL: http://localhost:8000/utils/box-optimization/add-items/75
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\views\generic\edit.py"
in get_success_url
116. url = self.object.get_absolute_url()
During handling of the above exception ('ItemsTestCollection' object has no
attribute 'get_absolute_url'), another exception occurred:
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 post
172. return super().post(request, *args, **kwargs)
File
"C:\miniconda3\envs\django\lib\site-packages\django\views\generic\edit.py"
in post
142. return self.form_valid(form)
File
"C:\miniconda3\envs\django\lib\site-packages\django\views\generic\edit.py"
in form_valid
126. return super().form_valid(form)
File
"C:\miniconda3\envs\django\lib\site-packages\django\views\generic\edit.py"
in form_valid
57. return HttpResponseRedirect(self.get_success_url())
File
"C:\miniconda3\envs\django\lib\site-packages\django\views\generic\edit.py"
in get_success_url
119. "No URL to redirect to. Either provide a url or
define"
Exception Type: ImproperlyConfigured at /utils/box-optimization/add-items/75
Exception Value: No URL to redirect to. Either provide a url or define a
get_absolute_url method on the Model.
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