python - Select2 widget for ManyToMany relationship -

i using django-select2 widgets nicer manytomany widget. view looks nicer , can search , select many different users. however, when save model, list of allowed users blank. tried direct view , unit tests. cannot fathom doing wrong.

any idea?

i suspect there 2 problems: 1 in saving of form created model , 1 how set data dictionary values.

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my model:

class projectcode(models.model):     allowed_users = models.manytomanyfield(user, blank=true) 

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my form:

class projectcodeform(forms.modelform):     class meta:         model = projectcode         fields = '__all__'         widgets = {'allowed_users': select2multiplewidget(), } 

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my view:

def create_code(request):     context = {}     if request.method == 'post':         form = projectcodeform(request.post)         if form.is_valid():             new = form.save(commit=false)             new.save()     form = projectcodeform()     context['form'] = form     return render(request, 'order_book/create_code.html', context) 

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my test:

def test_code_create_post_pass(self):     init = len(projectcode.objects.all())     data = {'allowed_users': [self.jdoe.pk, ], }     response = self.client.post('/order_book/code/create/', data)     self.assertequal(response.status_code, 200)     self.assertcontains(response, "create project code")     self.assertequal(init + 1, len(projectcode.objects.all()))     self.assertequal("jdoe", projectcode.objects.all()[0].display_allowed_users()) 

this tests fails with:

====================================================================== fail: test_code_create_post_pass (order_book.tests.authorisedviewtest) ---------------------------------------------------------------------- traceback (most recent call last):   file "/path/tests.py", line 385, in test_code_create_post_pass     "jdoe", projectcode.objects.all()[0].display_allowed_users()) assertionerror: u'jdoe' != u'' - jdoe + 

post question, continue play pdb , idea pops up… modified view to:

def create_code(request):     context = {}     if request.method == 'post':         form = projectcodeform(request.post)         if form.is_valid():             new = form.save(commit=false)             # doing "clever" things new object here,             # setting creator , created date/time…             new.save()             usr in form.cleaned_data['allowed_users']:  # ← not correct                 new.allowed_users.add(usr)  # ← neither this…     form = projectcodeform()     context['form'] = form     return render(request, 'order_book/create_code.html', context) 

i getting error saying allowed_users not set new did not have primary key yet. lead me try set data after having saved object.

note test data correct , test passes fine.

alternatively, read freaking documentation , use correct method save_m2m():

def create_code(request):     context = {}     if request.method == 'post':         form = projectcodeform(request.post)         if form.is_valid():             new = form.save(commit=false)             # doing "clever" things new object here,             # setting creator , created date/time…             new.save()             form.save_m2m()  # ← correct!     form = projectcodeform()     context['form'] = form     return render(request, 'order_book/create_code.html', context)