Source code for dal.views

"""Base views for autocomplete widgets."""

import json

import django
from django import http
from django.contrib.auth import get_permission_codename
from django.core.exceptions import ImproperlyConfigured
from django.http import HttpResponseBadRequest, HttpResponseNotAllowed
from django.utils import six
from django.views.generic.list import BaseListView

[docs]class ViewMixin(object): """Common methods for autocomplete views. It is assumed this view will be used in conjunction with a Django :py:class:`View` based class that will that will implement OPTIONS. .. py:attribute:: forwarded Dict of field values that were forwarded from the form, may be used to filter autocompletion results based on the form state. See ``linked_data`` example for reference. .. py:attribute:: q Query string as typed by the user in the autocomplete field. """ http_method_allowed = ('GET', 'POST')
[docs] def dispatch(self, request, *args, **kwargs): """Set :py:attr:`forwarded` and :py:attr:`q`.""" if request.method.upper() not in self.http_method_allowed: return HttpResponseNotAllowed(self.http_method_allowed) try: self.forwarded = json.loads( getattr(request, request.method).get('forward', '{}') ) except ValueError: return HttpResponseBadRequest('Invalid JSON data') if not isinstance(self.forwarded, dict): return HttpResponseBadRequest('Not a JSON object') self.q = request.GET.get('q', '') return super(ViewMixin, self).dispatch(request, *args, **kwargs)
[docs]class BaseQuerySetView(ViewMixin, BaseListView): """Base view to get results from a QuerySet. .. py:attribute:: create_field Name of the field to use to create missing values. For example, if create_field='title', and the user types in "foo", then the autocomplete view will propose an option 'Create "foo"' if it can't find any value matching "foo". When the user does click 'Create "foo"', the autocomplete script should POST to this view to create the object and get back the newly created object id. .. py:attribute:: model_field_name Name of the Model field to run filter against. """ paginate_by = 10 context_object_name = 'results' model_field_name = 'name' create_field = None
[docs] def has_more(self, context): """For widgets that have infinite-scroll feature.""" return context['page_obj'].has_next()
[docs] def get_result_value(self, result): """Return the value of a result.""" return str(
[docs] def get_result_label(self, result): """Return the label of a result.""" return six.text_type(result)
[docs] def get_selected_result_label(self, result): """Return the label of a selected result.""" return self.get_result_label(result)
[docs] def get_queryset(self): """Filter the queryset with GET['q'].""" qs = super(BaseQuerySetView, self).get_queryset() if self.q: qs = qs.filter(**{'%s__icontains' % self.model_field_name: self.q}) return qs
[docs] def create_object(self, text): """Create an object given a text.""" return self.get_queryset().get_or_create( **{self.create_field: text})[0]
[docs] def has_add_permission(self, request): """Return True if the user has the permission to add a model.""" if django.VERSION < (2, 0, 0): auth = request.user.is_authenticated() else: auth = request.user.is_authenticated if not auth: return False opts = self.get_queryset().model._meta codename = get_permission_codename('add', opts) return request.user.has_perm("%s.%s" % (opts.app_label, codename))
[docs] def post(self, request): """Create an object given a text after checking permissions.""" if not self.has_add_permission(request): return http.HttpResponseForbidden() if not self.create_field: raise ImproperlyConfigured('Missing "create_field"') text = request.POST.get('text', None) if text is None: return http.HttpResponseBadRequest() result = self.create_object(text) return http.JsonResponse({ 'id':, 'text': self.get_result_label(result), })