Класс UpdateView (Django 2.1)
from django.views.generic import UpdateView
View for updating an object, with a response rendered by a template.
Атрибуты
Определено в | |
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content_type = None
|
TemplateResponseMixin |
context_object_name = None
|
SingleObjectMixin |
extra_context = None
|
ContextMixin |
fields = None
|
ModelFormMixin |
form_class = None
|
FormMixin |
http_method_names = ['get', 'post', 'put', 'patch', 'delete', 'head', 'options', 'trace']
|
View |
initial = {}
|
FormMixin |
model = None
|
SingleObjectMixin |
pk_url_kwarg = 'pk'
|
SingleObjectMixin |
prefix = None
|
FormMixin |
query_pk_and_slug = False
|
SingleObjectMixin |
queryset = None
|
SingleObjectMixin |
response_class = <class 'django.template.response.TemplateResponse'>
|
TemplateResponseMixin |
slug_field = 'slug'
|
SingleObjectMixin |
slug_url_kwarg = 'slug'
|
SingleObjectMixin |
success_url = None
|
FormMixin |
template_engine = None
|
TemplateResponseMixin |
template_name = None
|
TemplateResponseMixin |
template_name_field = None
|
SingleObjectTemplateResponseMixin |
template_name_suffix = '_form'
|
UpdateView |
template_name_suffix = '_detail'
|
SingleObjectTemplateResponseMixin |
Методы
def _allowed_methods(self):
return [m.upper() for m in self.http_method_names if hasattr(self, m)]
Основная точка входа процесса "запрос-ответ".
@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("You tried to pass in the %s method name as a "
"keyword argument to %s(). Don't do that."
% (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)
if hasattr(self, 'get') and not hasattr(self, 'head'):
self.head = self.get
self.request = request
self.args = args
self.kwargs = kwargs
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))
ModelFormMixin
If the form is valid, save the associated model.
def form_valid(self, form):
"""If the form is valid, save the associated model."""
self.object = form.save()
return super().form_valid(form)
FormMixin
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())
BaseUpdateView
Handle GET requests: instantiate a blank version of the form.
def get(self, request, *args, **kwargs):
self.object = self.get_object()
return super().get(request, *args, **kwargs)
ProcessFormView
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)
SingleObjectMixin
Insert the single object into the context dict.
def get_context_data(self, **kwargs):
"""Insert the single object into the context dict."""
context = {}
if self.object:
context['object'] = self.object
context_object_name = self.get_context_object_name(self.object)
if context_object_name:
context[context_object_name] = self.object
context.update(kwargs)
return super().get_context_data(**context)
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
Get the name to use for the object.
def get_context_object_name(self, obj):
"""Get the name to use for the object."""
if self.context_object_name:
return self.context_object_name
elif isinstance(obj, models.Model):
return obj._meta.model_name
else:
return None
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())
ModelFormMixin
Return the form class to use in this view.
def get_form_class(self):
"""Return the form class to use in this view."""
if self.fields is not None and self.form_class:
raise ImproperlyConfigured(
"Specifying both 'fields' and 'form_class' is not permitted."
)
if self.form_class:
return self.form_class
else:
if self.model is not None:
# If a model has been explicitly provided, use it
model = self.model
elif getattr(self, 'object', None) is not None:
# If this view is operating on a single object, use
# the class of that object
model = self.object.__class__
else:
# Try to get a queryset and extract the model class
# from that
model = self.get_queryset().model
if self.fields is None:
raise ImproperlyConfigured(
"Using ModelFormMixin (base class of %s) without "
"the 'fields' attribute is prohibited." % self.__class__.__name__
)
return model_forms.modelform_factory(model, fields=self.fields)
FormMixin
Return the form class to use.
def get_form_class(self):
"""Return the form class to use."""
return self.form_class
ModelFormMixin
Return the keyword arguments for instantiating the form.
def get_form_kwargs(self):
"""Return the keyword arguments for instantiating the form."""
kwargs = super().get_form_kwargs()
if hasattr(self, 'object'):
kwargs.update({'instance': self.object})
return kwargs
FormMixin
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 object the view is displaying. Require `self.queryset` and a `pk` or `slug` argument in the URLconf. Subclasses can override this to return any object.
def get_object(self, queryset=None):
"""
Return the object the view is displaying.
Require `self.queryset` and a `pk` or `slug` argument in the URLconf.
Subclasses can override this to return any object.
"""
# Use a custom queryset if provided; this is required for subclasses
# like DateDetailView
if queryset is None:
queryset = self.get_queryset()
# Next, try looking up by primary key.
pk = self.kwargs.get(self.pk_url_kwarg)
slug = self.kwargs.get(self.slug_url_kwarg)
if pk is not None:
queryset = queryset.filter(pk=pk)
# Next, try looking up by slug.
if slug is not None and (pk is None or self.query_pk_and_slug):
slug_field = self.get_slug_field()
queryset = queryset.filter(**{slug_field: slug})
# If none of those are defined, it's an error.
if pk is None and slug is None:
raise AttributeError(
"Generic detail view %s must be called with either an object "
"pk or a slug in the URLconf." % self.__class__.__name__
)
try:
# Get the single item from the filtered queryset
obj = queryset.get()
except queryset.model.DoesNotExist:
raise Http404(_("No %(verbose_name)s found matching the query") %
{'verbose_name': queryset.model._meta.verbose_name})
return obj
Return the prefix to use for forms.
def get_prefix(self):
"""Return the prefix to use for forms."""
return self.prefix
Return the `QuerySet` that will be used to look up the object. This method is called by the default implementation of get_object() and may not be called if get_object() is overridden.
def get_queryset(self):
"""
Return the `QuerySet` that will be used to look up the object.
This method is called by the default implementation of get_object() and
may not be called if get_object() is overridden.
"""
if self.queryset is None:
if self.model:
return self.model._default_manager.all()
else:
raise ImproperlyConfigured(
"%(cls)s is missing a QuerySet. Define "
"%(cls)s.model, %(cls)s.queryset, or override "
"%(cls)s.get_queryset()." % {
'cls': self.__class__.__name__
}
)
return self.queryset.all()
Get the name of a slug field to be used to look up by slug.
def get_slug_field(self):
"""Get the name of a slug field to be used to look up by slug."""
return self.slug_field
ModelFormMixin
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 self.success_url:
url = self.success_url.format(**self.object.__dict__)
else:
try:
url = self.object.get_absolute_url()
except AttributeError:
raise ImproperlyConfigured(
"No URL to redirect to. Either provide a url or define"
" a get_absolute_url method on the Model.")
return url
FormMixin
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
SingleObjectTemplateResponseMixin
Return a list of template names to be used for the request. May not be called if render_to_response() is overridden. Return the following list: * the value of ``template_name`` on the view (if provided) * the contents of the ``template_name_field`` field on the object instance that the view is operating upon (if available) * ``<app_label>/<model_name><template_name_suffix>.html``
def get_template_names(self):
"""
Return a list of template names to be used for the request. May not be
called if render_to_response() is overridden. Return the following list:
* the value of ``template_name`` on the view (if provided)
* the contents of the ``template_name_field`` field on the
object instance that the view is operating upon (if available)
* ``<app_label>/<model_name><template_name_suffix>.html``
"""
try:
names = super().get_template_names()
except ImproperlyConfigured:
# If template_name isn't specified, it's not a problem --
# we just start with an empty list.
names = []
# If self.template_name_field is set, grab the value of the field
# of that name from the object; this is the most specific template
# name, if given.
if self.object and self.template_name_field:
name = getattr(self.object, self.template_name_field, None)
if name:
names.insert(0, name)
# The least-specific option is the default <app>/<model>_detail.html;
# only use this if the object in question is a model.
if isinstance(self.object, models.Model):
object_meta = self.object._meta
names.append("%s/%s%s.html" % (
object_meta.app_label,
object_meta.model_name,
self.template_name_suffix
))
elif getattr(self, 'model', None) is not None and issubclass(self.model, models.Model):
names.append("%s/%s%s.html" % (
self.model._meta.app_label,
self.model._meta.model_name,
self.template_name_suffix
))
# If we still haven't managed to find any template names, we should
# re-raise the ImproperlyConfigured to alert the user.
if not names:
raise
return names
TemplateResponseMixin
Return a list of template names to be used for the request. Must return a list. May not be called if render_to_response() is overridden.
def get_template_names(self):
"""
Return a list of template names to be used for the request. Must return
a list. May not be called if render_to_response() is overridden.
"""
if self.template_name is None:
raise ImproperlyConfigured(
"TemplateResponseMixin requires either a definition of "
"'template_name' or an implementation of 'get_template_names()'")
else:
return [self.template_name]
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())
Конструктор. Вызывается в URLconf; может содержать полезные дополнительные ключевые аргументы и другие вещи.
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)
Обрабатывает ответы на запросы для запроса HTTP OPTIONS.
def options(self, request, *args, **kwargs):
"""Handle responding to requests for the OPTIONS HTTP verb."""
response = HttpResponse()
response['Allow'] = ', '.join(self._allowed_methods())
response['Content-Length'] = '0'
return response
BaseUpdateView
Обработчик POST-запросов. Создает экземпляр формы из переданных POST переменных и проверяет их.
def post(self, request, *args, **kwargs):
self.object = self.get_object()
return super().post(request, *args, **kwargs)
ProcessFormView
Обработчик POST-запросов. Создает экземпляр формы из переданных POST переменных и проверяет их.
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)
Возвращает ответ (response), используя `response_class` для этого представления, с шаблоном, отображаемым с заданным контекстом. Передает response_kwargs в конструктор класса ответа.
def render_to_response(self, context, **response_kwargs):
"""
Return a response, using the `response_class` for this view, with a
template rendered with the given context.
Pass response_kwargs to the constructor of the response class.
"""
response_kwargs.setdefault('content_type', self.content_type)
return self.response_class(
request=self.request,
template=self.get_template_names(),
context=context,
using=self.template_engine,
**response_kwargs
)