mirror of
https://github.com/django/django.git
synced 2024-11-18 07:26:04 +00:00
192 lines
7.1 KiB
Plaintext
192 lines
7.1 KiB
Plaintext
======================
|
|
Multiple object mixins
|
|
======================
|
|
|
|
MultipleObjectMixin
|
|
-------------------
|
|
|
|
.. class:: django.views.generic.list.MultipleObjectMixin
|
|
|
|
A mixin that can be used to display a list of objects.
|
|
|
|
If ``paginate_by`` is specified, Django will paginate the results returned
|
|
by this. You can specify the page number in the URL in one of two ways:
|
|
|
|
* Use the ``page`` parameter in the URLconf. For example, this is what
|
|
your URLconf might look like::
|
|
|
|
(r'^objects/page(?P<page>[0-9]+)/$', PaginatedView.as_view())
|
|
|
|
* Pass the page number via the ``page`` query-string parameter. For
|
|
example, a URL would look like this::
|
|
|
|
/objects/?page=3
|
|
|
|
These values and lists are 1-based, not 0-based, so the first page would be
|
|
represented as page ``1``.
|
|
|
|
For more on pagination, read the :doc:`pagination documentation
|
|
</topics/pagination>`.
|
|
|
|
As a special case, you are also permitted to use ``last`` as a value for
|
|
``page``::
|
|
|
|
/objects/?page=last
|
|
|
|
This allows you to access the final page of results without first having to
|
|
determine how many pages there are.
|
|
|
|
Note that ``page`` *must* be either a valid page number or the value
|
|
``last``; any other value for ``page`` will result in a 404 error.
|
|
|
|
**Extends**
|
|
|
|
* :class:`django.views.generic.base.ContextMixin`
|
|
|
|
**Methods and Attributes**
|
|
|
|
.. attribute:: allow_empty
|
|
|
|
A boolean specifying whether to display the page if no objects are
|
|
available. If this is ``False`` and no objects are available, the view
|
|
will raise a 404 instead of displaying an empty page. By default, this
|
|
is ``True``.
|
|
|
|
.. attribute:: model
|
|
|
|
The model that this view will display data for. Specifying ``model
|
|
= Foo`` is effectively the same as specifying ``queryset =
|
|
Foo.objects.all()``.
|
|
|
|
.. attribute:: queryset
|
|
|
|
A ``QuerySet`` that represents the objects. If provided, the value of
|
|
:attr:`MultipleObjectMixin.queryset` supersedes the value provided for
|
|
:attr:`MultipleObjectMixin.model`.
|
|
|
|
.. attribute:: paginate_by
|
|
|
|
An integer specifying how many objects should be displayed per page. If
|
|
this is given, the view will paginate objects with
|
|
:attr:`MultipleObjectMixin.paginate_by` objects per page. The view will
|
|
expect either a ``page`` query string parameter (via ``request.GET``)
|
|
or a ``page`` variable specified in the URLconf.
|
|
|
|
.. attribute:: page_kwarg
|
|
|
|
.. versionadded:: 1.5
|
|
|
|
A string specifying the name to use for the page parameter.
|
|
The view will expect this prameter to be available either as a query
|
|
string parameter (via ``request.GET``) or as a kwarg variable specified
|
|
in the URLconf. Defaults to ``page``.
|
|
|
|
.. attribute:: paginator_class
|
|
|
|
The paginator class to be used for pagination. By default,
|
|
:class:`django.core.paginator.Paginator` is used. If the custom paginator
|
|
class doesn't have the same constructor interface as
|
|
:class:`django.core.paginator.Paginator`, you will also need to
|
|
provide an implementation for :meth:`MultipleObjectMixin.get_paginator`.
|
|
|
|
.. attribute:: context_object_name
|
|
|
|
Designates the name of the variable to use in the context.
|
|
|
|
.. method:: get_queryset()
|
|
|
|
Get the list of items for this view. This must be an iterable and may
|
|
be a queryset (in which queryset-specific behavior will be enabled).
|
|
|
|
.. method:: paginate_queryset(queryset, page_size)
|
|
|
|
Returns a 4-tuple containing (``paginator``, ``page``, ``object_list``,
|
|
``is_paginated``).
|
|
|
|
Constructed by paginating ``queryset`` into pages of size ``page_size``.
|
|
If the request contains a ``page`` argument, either as a captured URL
|
|
argument or as a GET argument, ``object_list`` will correspond to the
|
|
objects from that page.
|
|
|
|
.. method:: get_paginate_by(queryset)
|
|
|
|
Returns the number of items to paginate by, or ``None`` for no
|
|
pagination. By default this simply returns the value of
|
|
:attr:`MultipleObjectMixin.paginate_by`.
|
|
|
|
.. method:: get_paginator(queryset, per_page, orphans=0, allow_empty_first_page=True)
|
|
|
|
Returns an instance of the paginator to use for this view. By default,
|
|
instantiates an instance of :attr:`paginator_class`.
|
|
|
|
.. method:: get_allow_empty()
|
|
|
|
Return a boolean specifying whether to display the page if no objects
|
|
are available. If this method returns ``False`` and no objects are
|
|
available, the view will raise a 404 instead of displaying an empty
|
|
page. By default, this is ``True``.
|
|
|
|
.. method:: get_context_object_name(object_list)
|
|
|
|
Return the context variable name that will be used to contain
|
|
the list of data that this view is manipulating. If
|
|
``object_list`` is a queryset of Django objects and
|
|
:attr:`~MultipleObjectMixin.context_object_name` is not set,
|
|
the context name will be the ``object_name`` of the model that
|
|
the queryset is composed from, with postfix ``'_list'``
|
|
appended. For example, the model ``Article`` would have a
|
|
context object named ``article_list``.
|
|
|
|
.. method:: get_context_data(**kwargs)
|
|
|
|
Returns context data for displaying the list of objects.
|
|
|
|
**Context**
|
|
|
|
* ``object_list``: The list of objects that this view is displaying. If
|
|
``context_object_name`` is specified, that variable will also be set
|
|
in the context, with the same value as ``object_list``.
|
|
|
|
* ``is_paginated``: A boolean representing whether the results are
|
|
paginated. Specifically, this is set to ``False`` if no page size has
|
|
been specified, or if the available objects do not span multiple
|
|
pages.
|
|
|
|
* ``paginator``: An instance of
|
|
:class:`django.core.paginator.Paginator`. If the page is not
|
|
paginated, this context variable will be ``None``.
|
|
|
|
* ``page_obj``: An instance of
|
|
:class:`django.core.paginator.Page`. If the page is not paginated,
|
|
this context variable will be ``None``.
|
|
|
|
|
|
MultipleObjectTemplateResponseMixin
|
|
-----------------------------------
|
|
|
|
.. class:: django.views.generic.list.MultipleObjectTemplateResponseMixin
|
|
|
|
A mixin class that performs template-based response rendering for views
|
|
that operate upon a list of object instances. Requires that the view it is
|
|
mixed with provides ``self.object_list``, the list of object instances that
|
|
the view is operating on. ``self.object_list`` may be, but is not required
|
|
to be, a :class:`~django.db.models.query.QuerySet`.
|
|
|
|
**Extends**
|
|
|
|
* :class:`~django.views.generic.base.TemplateResponseMixin`
|
|
|
|
**Methods and Attributes**
|
|
|
|
.. attribute:: template_name_suffix
|
|
|
|
The suffix to append to the auto-generated candidate template name.
|
|
Default suffix is ``_list``.
|
|
|
|
.. method:: get_template_names()
|
|
|
|
Returns a list of candidate template names. Returns the following list:
|
|
|
|
* the value of ``template_name`` on the view (if provided)
|
|
* ``<app_label>/<object_name><template_name_suffix>.html``
|