author | Sverre Rabbelier <srabbelier@gmail.com> |
Sat, 28 Feb 2009 12:32:52 +0000 | |
changeset 1557 | 9e32e6258319 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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from django.forms.models import ModelFormMetaclass, ModelForm |
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from django.template import RequestContext, loader |
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from django.http import Http404, HttpResponse, HttpResponseRedirect |
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from django.core.xheaders import populate_xheaders |
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from django.core.exceptions import ObjectDoesNotExist, ImproperlyConfigured |
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from django.utils.translation import ugettext |
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from django.contrib.auth.views import redirect_to_login |
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from django.views.generic import GenericViewError |
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def apply_extra_context(extra_context, context): |
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""" |
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Adds items from extra_context dict to context. If a value in extra_context |
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is callable, then it is called and the result is added to context. |
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""" |
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for key, value in extra_context.iteritems(): |
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if callable(value): |
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context[key] = value() |
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else: |
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context[key] = value |
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def get_model_and_form_class(model, form_class): |
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""" |
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Returns a model and form class based on the model and form_class |
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parameters that were passed to the generic view. |
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If ``form_class`` is given then its associated model will be returned along |
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with ``form_class`` itself. Otherwise, if ``model`` is given, ``model`` |
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itself will be returned along with a ``ModelForm`` class created from |
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``model``. |
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""" |
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if form_class: |
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return form_class._meta.model, form_class |
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if model: |
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# The inner Meta class fails if model = model is used for some reason. |
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tmp_model = model |
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# TODO: we should be able to construct a ModelForm without creating |
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# and passing in a temporary inner class. |
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class Meta: |
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model = tmp_model |
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class_name = model.__name__ + 'Form' |
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form_class = ModelFormMetaclass(class_name, (ModelForm,), {'Meta': Meta}) |
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return model, form_class |
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raise GenericViewError("Generic view must be called with either a model or" |
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" form_class argument.") |
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def redirect(post_save_redirect, obj): |
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""" |
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Returns a HttpResponseRedirect to ``post_save_redirect``. |
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``post_save_redirect`` should be a string, and can contain named string- |
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substitution place holders of ``obj`` field names. |
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|
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If ``post_save_redirect`` is None, then redirect to ``obj``'s URL returned |
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by ``get_absolute_url()``. If ``obj`` has no ``get_absolute_url`` method, |
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then raise ImproperlyConfigured. |
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This function is meant to handle the post_save_redirect parameter to the |
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``create_object`` and ``update_object`` views. |
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""" |
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if post_save_redirect: |
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return HttpResponseRedirect(post_save_redirect % obj.__dict__) |
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elif hasattr(obj, 'get_absolute_url'): |
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return HttpResponseRedirect(obj.get_absolute_url()) |
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else: |
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raise ImproperlyConfigured( |
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"No URL to redirect to. Either pass a post_save_redirect" |
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" parameter to the generic view or define a get_absolute_url" |
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" method on the Model.") |
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def lookup_object(model, object_id, slug, slug_field): |
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""" |
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Return the ``model`` object with the passed ``object_id``. If |
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``object_id`` is None, then return the the object whose ``slug_field`` |
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equals the passed ``slug``. If ``slug`` and ``slug_field`` are not passed, |
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then raise Http404 exception. |
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""" |
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lookup_kwargs = {} |
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if object_id: |
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lookup_kwargs['%s__exact' % model._meta.pk.name] = object_id |
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elif slug and slug_field: |
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lookup_kwargs['%s__exact' % slug_field] = slug |
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else: |
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raise GenericViewError( |
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"Generic view must be called with either an object_id or a" |
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" slug/slug_field.") |
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try: |
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return model.objects.get(**lookup_kwargs) |
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except ObjectDoesNotExist: |
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raise Http404("No %s found for %s" |
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% (model._meta.verbose_name, lookup_kwargs)) |
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|
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def create_object(request, model=None, template_name=None, |
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template_loader=loader, extra_context=None, post_save_redirect=None, |
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login_required=False, context_processors=None, form_class=None): |
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""" |
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Generic object-creation function. |
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|
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Templates: ``<app_label>/<model_name>_form.html`` |
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Context: |
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form |
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the form for the object |
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""" |
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if extra_context is None: extra_context = {} |
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105 |
if login_required and not request.user.is_authenticated(): |
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106 |
return redirect_to_login(request.path) |
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107 |
|
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model, form_class = get_model_and_form_class(model, form_class) |
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if request.method == 'POST': |
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form = form_class(request.POST, request.FILES) |
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if form.is_valid(): |
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new_object = form.save() |
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if request.user.is_authenticated(): |
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request.user.message_set.create(message=ugettext("The %(verbose_name)s was created successfully.") % {"verbose_name": model._meta.verbose_name}) |
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return redirect(post_save_redirect, new_object) |
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116 |
else: |
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form = form_class() |
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118 |
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# Create the template, context, response |
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120 |
if not template_name: |
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template_name = "%s/%s_form.html" % (model._meta.app_label, model._meta.object_name.lower()) |
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t = template_loader.get_template(template_name) |
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c = RequestContext(request, { |
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'form': form, |
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}, context_processors) |
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apply_extra_context(extra_context, c) |
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return HttpResponse(t.render(c)) |
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128 |
|
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129 |
def update_object(request, model=None, object_id=None, slug=None, |
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slug_field='slug', template_name=None, template_loader=loader, |
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extra_context=None, post_save_redirect=None, login_required=False, |
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context_processors=None, template_object_name='object', |
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form_class=None): |
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""" |
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Generic object-update function. |
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136 |
|
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Templates: ``<app_label>/<model_name>_form.html`` |
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138 |
Context: |
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form |
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the form for the object |
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141 |
object |
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the original object being edited |
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143 |
""" |
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if extra_context is None: extra_context = {} |
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145 |
if login_required and not request.user.is_authenticated(): |
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146 |
return redirect_to_login(request.path) |
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147 |
|
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model, form_class = get_model_and_form_class(model, form_class) |
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obj = lookup_object(model, object_id, slug, slug_field) |
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150 |
|
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151 |
if request.method == 'POST': |
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form = form_class(request.POST, request.FILES, instance=obj) |
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153 |
if form.is_valid(): |
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obj = form.save() |
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if request.user.is_authenticated(): |
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156 |
request.user.message_set.create(message=ugettext("The %(verbose_name)s was updated successfully.") % {"verbose_name": model._meta.verbose_name}) |
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157 |
return redirect(post_save_redirect, obj) |
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158 |
else: |
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159 |
form = form_class(instance=obj) |
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160 |
|
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161 |
if not template_name: |
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162 |
template_name = "%s/%s_form.html" % (model._meta.app_label, model._meta.object_name.lower()) |
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t = template_loader.get_template(template_name) |
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164 |
c = RequestContext(request, { |
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'form': form, |
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166 |
template_object_name: obj, |
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167 |
}, context_processors) |
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168 |
apply_extra_context(extra_context, c) |
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169 |
response = HttpResponse(t.render(c)) |
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populate_xheaders(request, response, model, getattr(obj, obj._meta.pk.attname)) |
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171 |
return response |
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172 |
|
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173 |
def delete_object(request, model, post_delete_redirect, object_id=None, |
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174 |
slug=None, slug_field='slug', template_name=None, |
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175 |
template_loader=loader, extra_context=None, login_required=False, |
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176 |
context_processors=None, template_object_name='object'): |
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177 |
""" |
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178 |
Generic object-delete function. |
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179 |
|
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180 |
The given template will be used to confirm deletetion if this view is |
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181 |
fetched using GET; for safty, deletion will only be performed if this |
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182 |
view is POSTed. |
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183 |
|
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184 |
Templates: ``<app_label>/<model_name>_confirm_delete.html`` |
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185 |
Context: |
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186 |
object |
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187 |
the original object being deleted |
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188 |
""" |
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189 |
if extra_context is None: extra_context = {} |
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190 |
if login_required and not request.user.is_authenticated(): |
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191 |
return redirect_to_login(request.path) |
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192 |
|
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193 |
obj = lookup_object(model, object_id, slug, slug_field) |
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194 |
|
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195 |
if request.method == 'POST': |
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196 |
obj.delete() |
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197 |
if request.user.is_authenticated(): |
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198 |
request.user.message_set.create(message=ugettext("The %(verbose_name)s was deleted.") % {"verbose_name": model._meta.verbose_name}) |
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199 |
return HttpResponseRedirect(post_delete_redirect) |
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200 |
else: |
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201 |
if not template_name: |
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202 |
template_name = "%s/%s_confirm_delete.html" % (model._meta.app_label, model._meta.object_name.lower()) |
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203 |
t = template_loader.get_template(template_name) |
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204 |
c = RequestContext(request, { |
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205 |
template_object_name: obj, |
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206 |
}, context_processors) |
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207 |
apply_extra_context(extra_context, c) |
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208 |
response = HttpResponse(t.render(c)) |
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209 |
populate_xheaders(request, response, model, getattr(obj, obj._meta.pk.attname)) |
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210 |
return response |