# Τεκμηρίωση του Django - 1.10.7

# 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:

        url(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 pagination documentation.

  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

  - `django.views.generic.base.ContextMixin`

  Methods and Attributes

  `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`.

  `model`

    The model that this view will display data for. Specifying `model = Foo` is effectively the same as specifying `queryset = Foo.objects.all()`, where `objects` stands for `Foo`’s default manager.

  `queryset`

    A `QuerySet` that represents the objects. If provided, the value of `queryset` supersedes the value provided for `model`.

    Προειδοποίηση

    `queryset` is a class attribute with a mutable value so care must be taken when using it directly. Before using it, either call its `all()` method or retrieve it with `get_queryset()` which takes care of the cloning behind the scenes.

  `ordering`

    A string or list of strings specifying the ordering to apply to the `queryset`. Valid values are the same as those for `order_by()`.

  `paginate_by`

    An integer specifying how many objects should be displayed per page. If this is given, the view will paginate objects with `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.

  `paginate_orphans`

    An integer specifying the number of “overflow” objects the last page can contain. This extends the `paginate_by` limit on the last page by up to `paginate_orphans`, in order to keep the last page from having a very small number of objects.

  `page_kwarg`

    A string specifying the name to use for the page parameter. The view will expect this parameter to be available either as a query string parameter (via `request.GET`) or as a kwarg variable specified in the URLconf. Defaults to `page`.

  `paginator_class`

    The paginator class to be used for pagination. By default, `django.core.paginator.Paginator` is used. If the custom paginator class doesn’t have the same constructor interface as `django.core.paginator.Paginator`, you will also need to provide an implementation for `get_paginator()`.

  `context_object_name`

    Designates the name of the variable to use in the context.

  `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).

  `get_ordering`()

    Returns a string (or iterable of strings) that defines the ordering that will be applied to the `queryset`.

    Returns `ordering` by default.

  `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.

  `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 `paginate_by`.

  `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 `paginator_class`.

  `get_paginate_orphans`()

    An integer specifying the number of “overflow” objects the last page can contain. By default this simply returns the value of `paginate_orphans`.

  `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`.

  `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 `context_object_name` is not set, the context name will be the `model_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`.

  `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 `django.core.paginator.Paginator`. If the page is not paginated, this context variable will be `None`.
  - `page_obj`: An instance of `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 `QuerySet`.

  Extends

  - `TemplateResponseMixin`

  Methods and Attributes

  `template_name_suffix`

    The suffix to append to the auto-generated candidate template name. Default suffix is `_list`.

  `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>/<model_name><template_name_suffix>.html`