How to set initial data in a FormMixin and DetailView - django

Question

I want to create a comment form using generic foreignkey, but a having troubles with getting the initial data for object_id and content_type in the form ?
class Comment(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
content_type= models.ForeignKey(ContentType, on_delete=models.CASCADE)
object_id = models.PositiveIntegerField()
content_object= GenericForeignKey()
parent= models.ForeignKey("self", null=True, blank=True, on_delete=models.CASCADE)
content = RichTextField()
time_stamp = models.DateTimeField(auto_now_add=True)
Forms.py
class CommentsForm(forms.ModelForm):
content_type = forms.CharField(widget=forms.HiddenInput)
object_id = forms.IntegerField(widget=forms.HiddenInput)
content = forms.CharField(widget=forms.Textarea(attrs={
'class':'form-control',
'cols':'4',
'rows':'3'
}))
class Meta:
model = Comment
fields = ['content','user','object_id', 'content_type']
Views.py
class SongDetail(FormMixin, DetailView):
model = Song
form_class = CommentsForm
def post(self, request, *args, **kwargs):
obj = self.get_object()
if not request.user.is_authenticated:
return redirect('music:obj.get_absolute_url()')
if form.is_valid():
form.save()
return self.form_valid(form)

Answer 1

You can try like this:
class SongDetail(ModelFormMixin, DetailView):
model = Song
form_class = CommentsForm
def get_initial(self):
obj = self.get_object()
return { 'content_type': obj.content_type, 'object_id': obj.object_id }
def post(self, request, *args, **kwargs):
if not request.user.is_authenticated:
return redirect('music:obj.get_absolute_url()')
form = self.get_form()
if form.is_valid():
return self.form_valid(form)
else:
return self.form_invalid(form)
FYI, I am using ModelFormMixin instead of FormMixin, as it provides save functionality built-in.
Here I am overriding get_initial method to return content_type and object_id from it. Then these values will be passed to the form and will be loaded as initial value.