CreateView and get_context_data()

[Timothy W. Cook]

I am trying to setup some context variable for use in a template when
I execute a create view.

class ReviewTitleCreateView(CreateView):
model = Review
form_class = ReviewTitleCreateForm
template_name = 'papers/review_title.html'

def get_context_data(self, **kwargs):
context = super(ReviewTitleCreateView, self).get_context_data(**kwargs)
context['title'] = self.paper__title
print('Title: ',self.paper__title)
return context


def get(self, request, *args, **kwargs):
form = self.form_class(initial=self.initial)
return render(request, self.template_name, {'form': form})

def post(self, request, *args, **kwargs):
form = self.form_class(request.POST)
if form.is_valid():
# <process form cleaned data>
form.save()
return HttpResponseRedirect('#')

return render(request, self.template_name, {'form': form})

The 'Title: ' isn't even printed in the terminal nor is it available
in the template. Well, it is available I suppose (there is no error)
but empty.

The Review model:
class Review(models.Model):
"""
A review at a specific stage of one paper.
"""
INCLUDE_CHOICES = [(True,'Include'),(False,'Exclude')]
STAGES = [('Selection by Title','Selection by Title'),('Selection
by Abstract','Selection by Abstract'), ('Selection by Full
Text','Selection by Full Text')]

paper = models.ForeignKey(Paper, verbose_name=_('Paper'),
related_name="%(app_label)s_%(class)s_related", null=False,
blank=False, help_text=_("The reviewed paper."))

include = models.NullBooleanField("Choice",
choices=INCLUDE_CHOICES, default=True, null=False, blank=False,
help_text="Select Include or Exclude for this stage of review.")

exclusion_choice = models.ForeignKey(Exclusion, null=True,
blank=True, related_name="%(app_label)s_%(class)s_related")

exclusion_text = models.TextField(null=True, blank=True)

def __str__(self):
return self.paper.title

===================================

Thoughts?






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[Lucas Magnum]

Timothy,

The "get_context_data" is called in get method, once you override it "get_context_data" isn't called anymore.

You can see in http://ccbv.co.uk/projects/Django/1.4/django.views.generic.edit/CreateView/ 

[]'s

Lucas Magnum.

2013/11/22 Timothy W. Cook <t...@mlhim.org>

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[Timothy W. Cook]

Lucas,

On Fri, Nov 22, 2013 at 9:58 AM, Lucas Magnum <lucasm...@gmail.com> wrote:
> Timothy,
> The "get_context_data" is called in get method, once you override it
> "get_context_data" isn't called anymore.
>

Right. So my thought process was that if I override it and place
additional information there it would be available in the template.
Obviously my thinking is incorrect, but where?

So how do I add variables to the context so that I can display their
value in the template?

In this case I want to get the title of the paper and display it in
the template. If I do this in get():

def get(self, request, *args, **kwargs):

paper = Paper.objects.filter(id=kwargs['pk'])
kwargs['title'] = paper[0].title
print('Title: ',kwargs['title'])

form = self.form_class(initial=self.initial)
return render(request, self.template_name, {'form': form})

IT prints it to the terminal okay. But (using DjDT) I do not see
where 'title' was added to kwargs. Not do I see it in the template
context.

Any idea what I am missing or how to do this?

Thanks,
Tim

[Daniel Roseman]

On Friday, 22 November 2013 13:13:46 UTC, Timothy W. Cook wrote:

Lucas,

On Fri, Nov 22, 2013 at 9:58 AM, Lucas Magnum <lucasm...@gmail.com> wrote:
> Timothy,
> The "get_context_data" is called in get method, once you override it
> "get_context_data" isn't called anymore.
>

Right.  So my thought process was that if I override it and place
additional information there it would be available in the template.
Obviously my thinking is incorrect, but where?

Lucas means that by overriding get(), you've removed the place where `get_context_data` is originally called. You could certainly do it within your own `get()` function, simply with `context = self.get_context_data()`, but you might as well keep it within `get()` as you do below.

 

So how do I add variables to the context so that I can display their
value in the template?

In this case I want to get the title of the paper and display it in
the template.  If I do this in get():

    def get(self, request, *args, **kwargs):
        paper = Paper.objects.filter(id=kwargs['pk'])
        kwargs['title'] = paper[0].title
        print('Title: ',kwargs['title'])
        form = self.form_class(initial=self.initial)
        return render(request, self.template_name, {'form': form})

IT prints it to the terminal okay.  But (using DjDT) I do not see
where 'title' was added to kwargs.  Not do I see it in the template
context.

Any idea what I am missing or how to do this?

You've added it to kwargs, but you haven't passed kwargs as the template context - you've simply hard-coded that to `{'form': form}`. 

--

DR. 

[Timothy W. Cook]

THanks Lucas and Daniel,

I 'think' I am starting to understand better.

def get(self, request, *args, **kwargs):
paper = Paper.objects.filter(id=kwargs['pk'])
kwargs['title'] = paper[0].title

kwargs['form'] = self.form_class(initial=self.initial)
return render(request, self.template_name, kwargs)

This works. However, what is the preferred/best practices way to do
this, using get_context_data() or just overriding get(). Does it
really matter?

Thanks,
Tim