216 lines
8.6 KiB
Python
216 lines
8.6 KiB
Python
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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from django.contrib import messages
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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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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 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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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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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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if login_required and not request.user.is_authenticated():
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return redirect_to_login(request.path)
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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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msg = ugettext("The %(verbose_name)s was created successfully.") %\
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{"verbose_name": model._meta.verbose_name}
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messages.success(request, msg, fail_silently=True)
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return redirect(post_save_redirect, new_object)
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else:
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form = form_class()
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# Create the template, context, response
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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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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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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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object
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the original object being edited
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"""
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if extra_context is None: extra_context = {}
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if login_required and not request.user.is_authenticated():
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return redirect_to_login(request.path)
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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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if request.method == 'POST':
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form = form_class(request.POST, request.FILES, instance=obj)
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if form.is_valid():
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obj = form.save()
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msg = ugettext("The %(verbose_name)s was updated successfully.") %\
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{"verbose_name": model._meta.verbose_name}
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messages.success(request, msg, fail_silently=True)
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return redirect(post_save_redirect, obj)
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else:
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form = form_class(instance=obj)
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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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template_object_name: obj,
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}, context_processors)
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apply_extra_context(extra_context, c)
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response = HttpResponse(t.render(c))
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populate_xheaders(request, response, model, getattr(obj, obj._meta.pk.attname))
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return response
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def delete_object(request, model, post_delete_redirect, object_id=None,
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slug=None, slug_field='slug', template_name=None,
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template_loader=loader, extra_context=None, login_required=False,
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context_processors=None, template_object_name='object'):
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"""
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Generic object-delete function.
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The given template will be used to confirm deletetion if this view is
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fetched using GET; for safty, deletion will only be performed if this
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view is POSTed.
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Templates: ``<app_label>/<model_name>_confirm_delete.html``
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Context:
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object
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the original object being deleted
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"""
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if extra_context is None: extra_context = {}
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if login_required and not request.user.is_authenticated():
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return redirect_to_login(request.path)
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obj = lookup_object(model, object_id, slug, slug_field)
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if request.method == 'POST':
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obj.delete()
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msg = ugettext("The %(verbose_name)s was deleted.") %\
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{"verbose_name": model._meta.verbose_name}
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messages.success(request, msg, fail_silently=True)
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return HttpResponseRedirect(post_delete_redirect)
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else:
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if not template_name:
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template_name = "%s/%s_confirm_delete.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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template_object_name: obj,
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}, context_processors)
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apply_extra_context(extra_context, c)
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response = HttpResponse(t.render(c))
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populate_xheaders(request, response, model, getattr(obj, obj._meta.pk.attname))
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return response
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