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from datetime import datetime
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from dateutil.relativedelta import relativedelta
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from django import forms
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from django.views.generic import list as list_cbv, edit, base, detail
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from django.shortcuts import get_object_or_404
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from django.http import Http404, HttpResponseRedirect
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from django.core.urlresolvers import resolve
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from django.core.exceptions import ImproperlyConfigured
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from calebasse.ressources.models import Service
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HOME_SERVICE_COOKIE = 'home-service'
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class ReturnToObjectMixin(object):
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def get_success_url(self):
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return '../#object-' + str(self.object.pk)
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class ServiceFormMixin(object):
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def get_form_kwargs(self):
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kwargs = super(ServiceFormMixin, self).get_form_kwargs()
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kwargs['service'] = self.service
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return kwargs
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class ServiceViewMixin(object):
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service = None
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date = None
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popup = False
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def dispatch(self, request, **kwargs):
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self.popup = request.GET.get('popup')
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if 'service' in kwargs:
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self.service = get_object_or_404(Service, slug=kwargs['service'])
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if 'date' in kwargs:
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try:
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self.date = datetime.strptime(kwargs.get('date'),
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'%Y-%m-%d').date()
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except (TypeError, ValueError):
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raise Http404
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result = super(ServiceViewMixin, self).dispatch(request, **kwargs)
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if self.service:
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result.set_cookie(HOME_SERVICE_COOKIE, self.service.slug,
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max_age=3600*24*365, httponly=True)
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return result
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def get_context_data(self, **kwargs):
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context = super(ServiceViewMixin, self).get_context_data(**kwargs)
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context['url_name'] = resolve(self.request.path).url_name
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context['popup'] = self.popup
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if self.service is not None:
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context['service'] = self.service.slug
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context['service_name'] = self.service.name
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if self.date is not None:
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context['date'] = self.date
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context['previous_day'] = self.date + relativedelta(days=-1)
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context['next_day'] = self.date + relativedelta(days=1)
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context['previous_month'] = self.date + relativedelta(months=-1)
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context['next_month'] = self.date + relativedelta(months=1)
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return context
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class TemplateView(ServiceViewMixin, base.TemplateView):
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pass
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class ModelNameMixin(object):
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def get_context_data(self, **kwargs):
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ctx = super(ModelNameMixin, self).get_context_data(**kwargs)
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ctx['model_verbose_name_plural'] = self.model._meta.verbose_name_plural
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ctx['model_verbose_name'] = self.model._meta.verbose_name
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return ctx
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class ListView(ModelNameMixin, ServiceViewMixin, list_cbv.ListView):
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pass
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class CreateView(ModelNameMixin, ServiceViewMixin, edit.CreateView):
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pass
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class DeleteView(ModelNameMixin, ServiceViewMixin, edit.DeleteView):
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pass
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class UpdateView(ModelNameMixin, ServiceViewMixin, edit.UpdateView):
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pass
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class FormView(ServiceViewMixin, edit.FormView):
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pass
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class ContextMixin(object):
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"""
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A default context mixin that passes the keyword arguments received by
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get_context_data as the template context.
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"""
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def get_context_data(self, **kwargs):
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if 'view' not in kwargs:
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kwargs['view'] = self
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return kwargs
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class MultiFormMixin(ContextMixin):
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"""
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A mixin that provides a way to show and handle multiple forms in a request.
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"""
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initial = {}
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initials = {}
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forms_classes = None
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success_url = None
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def get_prefixes(self):
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return self.forms_classes.keys()
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def get_initial(self, prefix):
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"""
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Returns the initial data to use for forms on this view.
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"""
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return self.initials.get(prefix, self.initial).copy()
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def get_form_class(self, prefix):
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"""
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Returns the form class to use in this view
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"""
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return self.forms_classes[prefix]
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def get_form(self, form_class, prefix):
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"""
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Returns an instance of the form to be used in this view.
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"""
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return form_class(**self.get_form_kwargs(prefix))
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def get_current_prefix(self):
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"""
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Returns the current prefix by parsing first keys in POST
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"""
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keys = self.request.POST.keys() or self.request.FILES.keys()
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for key in keys:
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if '-' in key:
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return key.split('-', 1)[0]
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return None
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def get_forms(self):
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"""
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Returns the dictionnary of forms instances
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"""
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form_instances = {}
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for prefix in self.get_prefixes():
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form_instances[prefix] = self.get_form(self.get_form_class(prefix), prefix)
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return form_instances
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def get_form_kwargs(self, prefix):
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"""
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Returns the keyword arguments for instantiating the form.
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"""
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kwargs = {'initial': self.get_initial(prefix),
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'prefix': prefix }
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if self.request.method in ('POST', 'PUT') \
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and prefix == self.get_current_prefix():
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kwargs.update({
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'data': self.request.POST,
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'files': self.request.FILES,
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})
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return kwargs
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def get_success_url(self):
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"""
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Returns the supplied success URL.
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"""
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if self.success_url:
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url = self.success_url
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else:
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raise ImproperlyConfigured(
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"No URL to redirect to. Provide a success_url.")
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return url
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def form_valid(self, forms):
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"""
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If the form is valid, redirect to the supplied URL.
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"""
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return HttpResponseRedirect(self.get_success_url())
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def form_invalid(self, forms):
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"""
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If the form is invalid, re-render the context data with the
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data-filled form and errors.
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"""
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return self.render_to_response(self.get_context_data(forms=forms))
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class MultiModelFormMixin(MultiFormMixin, detail.SingleObjectMixin):
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"""
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A mixin that provides a way to show and handle multiple forms or modelforms
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in a request.
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"""
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def get_form_kwargs(self, prefix):
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"""
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Returns the keyword arguments for instantiating the form.
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"""
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kwargs = super(MultiModelFormMixin, self).get_form_kwargs(prefix)
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if issubclass(self.get_form_class(prefix), forms.ModelForm):
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kwargs.update({'instance': self.object})
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return kwargs
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def get_success_url(self):
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"""
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Returns the supplied URL.
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"""
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if self.success_url:
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url = self.success_url % self.object.__dict__
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else:
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try:
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url = self.object.get_absolute_url()
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except AttributeError:
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raise ImproperlyConfigured(
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"No URL to redirect to. Either provide a url or define"
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" a get_absolute_url method on the Model.")
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return url
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def form_valid(self, form, commit=True):
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"""
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If the form is valid, save the associated model.
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"""
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form = form[self.get_current_prefix()]
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if hasattr(form, 'save'):
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if isinstance(form, forms.ModelForm):
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self.object = form.save(commit=commit)
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else:
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form.save()
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return super(MultiModelFormMixin, self).form_valid(form)
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def get_context_data(self, **kwargs):
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"""
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If an object has been supplied, inject it into the context with the
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supplied context_object_name name.
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"""
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context = {}
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if self.object:
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context['object'] = self.object
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context_object_name = self.get_context_object_name(self.object)
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if context_object_name:
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context[context_object_name] = self.object
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context.update(kwargs)
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return super(MultiModelFormMixin, self).get_context_data(**context)
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class ProcessMultiFormView(base.View):
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"""
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A mixin that renders a form on GET and processes it on POST.
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"""
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def get(self, request, *args, **kwargs):
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"""
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Handles GET requests and instantiates a blank version of the form.
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"""
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forms = self.get_forms()
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return self.render_to_response(self.get_context_data(forms=forms))
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def post(self, request, *args, **kwargs):
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"""
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Handles POST requests, instantiating a form instance with the passed
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POST variables and then checked for validity.
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"""
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forms = self.get_forms()
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prefix = self.get_current_prefix()
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if forms[prefix].is_valid():
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return self.form_valid(forms)
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else:
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return self.form_invalid(forms)
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# PUT is a valid HTTP verb for creating (with a known URL) or editing an
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# object, note that browsers only support POST for now.
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def put(self, *args, **kwargs):
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return self.post(*args, **kwargs)
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class BaseMultiFormView(MultiFormMixin, ProcessMultiFormView):
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"""
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A base view for displaying multiple forms
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"""
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class MultiFormView(base.TemplateResponseMixin, BaseMultiFormView):
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"""
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A base view for displaying multiple forms, and rendering a template reponse.
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"""
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class BaseMultiUpdateView(MultiModelFormMixin, ProcessMultiFormView):
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"""
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Base view for updating an existing object.
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Using this base class requires subclassing to provide a response mixin.
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"""
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def get(self, request, *args, **kwargs):
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self.object = self.get_object()
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return super(BaseMultiUpdateView, self).get(request, *args, **kwargs)
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def post(self, request, *args, **kwargs):
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self.object = self.get_object()
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return super(BaseMultiUpdateView, self).post(request, *args, **kwargs)
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class MultiUpdateView(detail.SingleObjectTemplateResponseMixin, BaseMultiUpdateView):
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"""
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View for updating an object,
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with a response rendered by template.
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"""
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template_name_suffix = '_form'
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