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dan mayer
Courses Plus Student 45 Pointswhat's the point of the 'if form_class is None' in the 'form_valid' method ?
in the class LoginView, I can't understand why do we check if the form_class in none
def get_form(self, form_class=None):
if form_class is None:
form_class=self.get_form_class()
return form_class(self.request,**self.get_form_kwargs())
the whole class is:
class LoginView(generic.FormView):
form_class = AuthenticationForm
success_url = '/'
template_name = "blog/post_form.html"
def get_form(self, form_class=None):
if form_class is None:
form_class=self.get_form_class()
return form_class(self.request,**self.get_form_kwargs())
def form_valid(self, form):
login(self.request,form.get_user())
return super().form_valid(form)
why not just use something like:
def get_form(self):
return self.form_class(self.request,**self.get_form_kwargs())
because the form_class will always be AuthenticationForm or am I missing something? Why should form_class be passed as a parameter in the get_form method? I am really confused on this.
1 Answer
Chris Freeman
Treehouse Moderator 68,441 PointsIn the default mode, form_class would not be provided as an argument, thus the get_form_class would return AuthenticationForm. However, if one wanted to provide an alternative form, then it could be passed to the get_form method.
It looks like the code was borrowed from the FormMixin class get_form method.
get_form(form_class=None) — Instantiate an instance of form_class using get_form_kwargs(). If form_class isn’t provided get_form_class() will be used.
ForumMixin.get_form source code:
def get_form(self, form_class=None):
"""Return an instance of the form to be used in this view."""
if form_class is None:
form_class = self.get_form_class()
return form_class(**self.get_form_kwargs())
dan mayer
Courses Plus Student 45 Pointsdan mayer
Courses Plus Student 45 Pointsanyone?