django1/django/views/generic/edit.py

243 lines
7.3 KiB
Python

from django.forms import models as model_forms
from django.core.exceptions import ImproperlyConfigured
from django.http import HttpResponseRedirect
from django.views.generic.base import TemplateResponseMixin, View
from django.views.generic.detail import (SingleObjectMixin,
SingleObjectTemplateResponseMixin, BaseDetailView)
class FormMixin(object):
"""
A mixin that provides a way to show and handle a form in a request.
"""
initial = {}
form_class = None
success_url = None
def get_initial(self):
"""
Returns the initial data to use for forms on this view.
"""
return self.initial
def get_form_class(self):
"""
Returns the form class to use in this view
"""
return self.form_class
def get_form(self, form_class):
"""
Returns an instance of the form to be used in this view.
"""
return form_class(**self.get_form_kwargs())
def get_form_kwargs(self):
"""
Returns the keyword arguments for instanciating the form.
"""
kwargs = {'initial': self.get_initial()}
if self.request.method in ('POST', 'PUT'):
kwargs.update({
'data': self.request.POST,
'files': self.request.FILES,
})
return kwargs
def get_context_data(self, **kwargs):
return kwargs
def get_success_url(self):
if self.success_url:
url = self.success_url
else:
raise ImproperlyConfigured(
"No URL to redirect to. Provide a success_url.")
return url
def form_valid(self, form):
return HttpResponseRedirect(self.get_success_url())
def form_invalid(self, form):
return self.render_to_response(self.get_context_data(form=form))
class ModelFormMixin(FormMixin, SingleObjectMixin):
"""
A mixin that provides a way to show and handle a modelform in a request.
"""
def get_form_class(self):
"""
Returns the form class to use in this view
"""
if self.form_class:
return self.form_class
else:
model = self.get_queryset().model
return model_forms.modelform_factory(model)
def get_form_kwargs(self):
"""
Returns the keyword arguments for instanciating the form.
"""
kwargs = super(ModelFormMixin, self).get_form_kwargs()
kwargs.update({'instance': self.object})
return kwargs
def get_success_url(self):
if self.success_url:
url = self.success_url % 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
def form_valid(self, form):
self.object = form.save()
return super(ModelFormMixin, self).form_valid(form)
def form_invalid(self, form):
return self.render_to_response(self.get_context_data(form=form))
def get_context_data(self, **kwargs):
context = kwargs
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
return context
class ProcessFormView(View):
"""
A mixin that processes a form on POST.
"""
def get(self, request, *args, **kwargs):
form_class = self.get_form_class()
form = self.get_form(form_class)
return self.render_to_response(self.get_context_data(form=form))
def post(self, request, *args, **kwargs):
form_class = self.get_form_class()
form = self.get_form(form_class)
if form.is_valid():
return self.form_valid(form)
else:
return self.form_invalid(form)
# PUT is a valid HTTP verb for creating (with a known URL) or editing an
# object, note that browsers only support POST for now.
def put(self, *args, **kwargs):
return self.post(*args, **kwargs)
class BaseFormView(FormMixin, ProcessFormView):
"""
A base view for displaying a form
"""
class FormView(TemplateResponseMixin, BaseFormView):
"""
A view for displaying a form, and rendering a template response.
"""
class BaseCreateView(ModelFormMixin, ProcessFormView):
"""
Base view for creating an new object instance.
Using this base class requires subclassing to provide a response mixin.
"""
def get(self, request, *args, **kwargs):
self.object = None
return super(BaseCreateView, self).get(request, *args, **kwargs)
def post(self, request, *args, **kwargs):
self.object = None
return super(BaseCreateView, self).post(request, *args, **kwargs)
# PUT is a valid HTTP verb for creating (with a known URL) or editing an
# object, note that browsers only support POST for now.
def put(self, *args, **kwargs):
return self.post(*args, **kwargs)
class CreateView(SingleObjectTemplateResponseMixin, BaseCreateView):
"""
View for creating an new object instance,
with a response rendered by template.
"""
template_name_suffix = '_form'
class BaseUpdateView(ModelFormMixin, ProcessFormView):
"""
Base view for updating an existing object.
Using this base class requires subclassing to provide a response mixin.
"""
def get(self, request, *args, **kwargs):
self.object = self.get_object()
return super(BaseUpdateView, self).get(request, *args, **kwargs)
def post(self, request, *args, **kwargs):
self.object = self.get_object()
return super(BaseUpdateView, self).post(request, *args, **kwargs)
# PUT is a valid HTTP verb for creating (with a known URL) or editing an
# object, note that browsers only support POST for now.
def put(self, *args, **kwargs):
return self.post(*args, **kwargs)
class UpdateView(SingleObjectTemplateResponseMixin, BaseUpdateView):
"""
View for updating an object,
with a response rendered by template..
"""
template_name_suffix = '_form'
class DeletionMixin(object):
"""
A mixin providing the ability to delete objects
"""
success_url = None
def delete(self, request, *args, **kwargs):
self.object = self.get_object()
self.object.delete()
return HttpResponseRedirect(self.get_success_url())
# Add support for browsers which only accept GET and POST for now.
def post(self, *args, **kwargs):
return self.delete(*args, **kwargs)
def get_success_url(self):
if self.success_url:
return self.success_url
else:
raise ImproperlyConfigured(
"No URL to redirect to. Provide a success_url.")
class BaseDeleteView(DeletionMixin, BaseDetailView):
"""
Base view for deleting an object.
Using this base class requires subclassing to provide a response mixin.
"""
class DeleteView(SingleObjectTemplateResponseMixin, BaseDeleteView):
"""
View for deleting an object retrieved with `self.get_object()`,
with a response rendered by template.
"""
template_name_suffix = '_confirm_delete'