Класс BaseFormView (Django 3.2)
from django.views.generic.edit import BaseFormView
A base view for displaying a form.
Ancestors (MRO)
- BaseFormView
- FormMixin
- ContextMixin
- ProcessFormView
- View
Attributes
Defined in | |
---|---|
extra_context = None
|
ContextMixin |
form_class = None
|
FormMixin |
http_method_names = ['get', 'post', 'put', 'patch', 'delete', 'head', 'options', 'trace']
|
View |
initial = {}
|
FormMixin |
prefix = None
|
FormMixin |
success_url = None
|
FormMixin |
Methods
def _allowed_methods(self):
return [m.upper() for m in self.http_method_names if hasattr(self, m)]
Main entry point for a request-response process.
@classonlymethod
def as_view(cls, **initkwargs):
"""Main entry point for a request-response process."""
for key in initkwargs:
if key in cls.http_method_names:
raise TypeError(
'The method name %s is not accepted as a keyword argument '
'to %s().' % (key, cls.__name__)
)
if not hasattr(cls, key):
raise TypeError("%s() received an invalid keyword %r. as_view "
"only accepts arguments that are already "
"attributes of the class." % (cls.__name__, key))
def view(request, *args, **kwargs):
self = cls(**initkwargs)
self.setup(request, *args, **kwargs)
if not hasattr(self, 'request'):
raise AttributeError(
"%s instance has no 'request' attribute. Did you override "
"setup() and forget to call super()?" % cls.__name__
)
return self.dispatch(request, *args, **kwargs)
view.view_class = cls
view.view_initkwargs = initkwargs
# take name and docstring from class
update_wrapper(view, cls, updated=())
# and possible attributes set by decorators
# like csrf_exempt from dispatch
update_wrapper(view, cls.dispatch, assigned=())
return view
def dispatch(self, request, *args, **kwargs):
# Try to dispatch to the right method; if a method doesn't exist,
# defer to the error handler. Also defer to the error handler if the
# request method isn't on the approved list.
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)
If the form is invalid, render the invalid form.
def form_invalid(self, form):
"""If the form is invalid, render the invalid form."""
return self.render_to_response(self.get_context_data(form=form))
If the form is valid, redirect to the supplied URL.
def form_valid(self, form):
"""If the form is valid, redirect to the supplied URL."""
return HttpResponseRedirect(self.get_success_url())
Handle GET requests: instantiate a blank version of the form.
def get(self, request, *args, **kwargs):
"""Handle GET requests: instantiate a blank version of the form."""
return self.render_to_response(self.get_context_data())
FormMixin
Insert the form into the context dict.
def get_context_data(self, **kwargs):
"""Insert the form into the context dict."""
if 'form' not in kwargs:
kwargs['form'] = self.get_form()
return super().get_context_data(**kwargs)
ContextMixin
def get_context_data(self, **kwargs):
kwargs.setdefault('view', self)
if self.extra_context is not None:
kwargs.update(self.extra_context)
return kwargs
Return an instance of the form to be used in this view.
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())
Return the form class to use.
def get_form_class(self):
"""Return the form class to use."""
return self.form_class
Return the keyword arguments for instantiating the form.
def get_form_kwargs(self):
"""Return the keyword arguments for instantiating the form."""
kwargs = {
'initial': self.get_initial(),
'prefix': self.get_prefix(),
}
if self.request.method in ('POST', 'PUT'):
kwargs.update({
'data': self.request.POST,
'files': self.request.FILES,
})
return kwargs
Return the initial data to use for forms on this view.
def get_initial(self):
"""Return the initial data to use for forms on this view."""
return self.initial.copy()
Return the prefix to use for forms.
def get_prefix(self):
"""Return the prefix to use for forms."""
return self.prefix
Return the URL to redirect to after processing a valid form.
def get_success_url(self):
"""Return the URL to redirect to after processing a valid form."""
if not self.success_url:
raise ImproperlyConfigured("No URL to redirect to. Provide a success_url.")
return str(self.success_url) # success_url may be lazy
def http_method_not_allowed(self, request, *args, **kwargs):
logger.warning(
'Method Not Allowed (%s): %s', request.method, request.path,
extra={'status_code': 405, 'request': request}
)
return HttpResponseNotAllowed(self._allowed_methods())
Constructor. Called in the URLconf; can contain helpful extra keyword arguments, and other things.
def __init__(self, **kwargs):
"""
Constructor. Called in the URLconf; can contain helpful extra
keyword arguments, and other things.
"""
# Go through keyword arguments, and either save their values to our
# instance, or raise an error.
for key, value in kwargs.items():
setattr(self, key, value)
Handle responding to requests for the OPTIONS HTTP verb.
def options(self, request, *args, **kwargs):
"""Handle responding to requests for the OPTIONS HTTP verb."""
response = HttpResponse()
response.headers['Allow'] = ', '.join(self._allowed_methods())
response.headers['Content-Length'] = '0'
return response
Handle POST requests: instantiate a form instance with the passed POST variables and then check if it's valid.
def post(self, request, *args, **kwargs):
"""
Handle POST requests: instantiate a form instance with the passed
POST variables and then check if it's valid.
"""
form = self.get_form()
if form.is_valid():
return self.form_valid(form)
else:
return self.form_invalid(form)
def put(self, *args, **kwargs):
return self.post(*args, **kwargs)
Initialize attributes shared by all view methods.
def setup(self, request, *args, **kwargs):
"""Initialize attributes shared by all view methods."""
if hasattr(self, 'get') and not hasattr(self, 'head'):
self.head = self.get
self.request = request
self.args = args
self.kwargs = kwargs