Django：将变量从 get_context_data() 传递到 post()

Question

The variable is defined inside get_context_view() since it requires an id to access correct database object:

class FooView(TemplateView):
  def get_context_data(self, id, **kwargs):
    ---
    bar = Bar.objects.get(id=id)
    ---

  def post(self, request, id, *args, **kwargs):
    # how to access bar?
    # should one call Bar.objects.get(id=id) again?

What would be the way to pass bar variable to post() ?

Tried to save it as FooView's field and access it via self.bar , but this doesn't do the trick. self.bar is not seen by post()

Answer 1

You should reverse it. If you need bar in post() , you need to create it there:

class FooView(TemplateView):
    def get_context_data(self, **kwargs):
        bar = self.bar

    def post(self, request, id, *args, **kwargs):
        self.bar = Bar.objects.get(id=id)
        ...

post() is called before get_context_data , that's why post doesn't see it if you define it in get_context_data .

Answer 2

As knbk said, my solution was the dispatch method, there I define the variables that I will use in get_context_data and in post methods, that worked for me as a way to share data here my example

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

    self.some_data = '123'
    if request.method.lower() in self.http_method_names:
        handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
    else:
        handler = self.http_method_not_allowed
    return handler(request, *args, **kwargs)

def get_context_data(self, **kwargs):
    context = super(MyTestCreateView, self).get_context_data(**kwargs)
    print('test get_context_data', self.some_data)

def post(self, request, *args, **kwargs):        
    print('test post', self.some_data)
    return super().post(request, *args, **kwargs)

Classy CBV I hope it helps

Answer 3

If the variable is defined in your CBV (Class Based View), it can directly be called in your template.

Views.py

class SomeRandomView(FormView):
    username = 'SomeValue'

Template.html

<p>Username is {{view.username}}<p>

Sidenote: You can even call the methods in your view class directly within the template file which is after version 1.5 Django if I could recall correctly.

Answer 4

I know its late, but I faced this same problem few days ago. However here is my solution.

def get_context_data(self, **kwargs):
    context = super().get_context_data(**kwargs)
    context['foos'] = self.object.filter()
    return context

def post(self, request, *args, **kwargs):
    context = super().post(request, *args, **kwargs)
    foos = self.get_context_data().get('foos')
    # do stuff here
    return context