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Many thanks to Daniel Greenfeld, James Aylett, Marc Tamlyn, Simon Williams, Danilo Bargen and Luke Plant for their work on this.
125 lines
4.7 KiB
Plaintext
125 lines
4.7 KiB
Plaintext
====================
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Single object mixins
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====================
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.. class:: django.views.generic.detail.SingleObjectMixin
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Provides a mechanism for looking up an object associated with the
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current HTTP request.
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**Methods and Attributes**
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.. attribute:: model
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The model that this view will display data for. Specifying ``model
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= Foo`` is effectively the same as specifying ``queryset =
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Foo.objects.all()``.
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.. attribute:: queryset
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A ``QuerySet`` that represents the objects. If provided, the value of
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:attr:`SingleObjectMixin.queryset` supersedes the value provided for
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:attr:`SingleObjectMixin.model`.
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.. attribute:: slug_field
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The name of the field on the model that contains the slug. By default,
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``slug_field`` is ``'slug'``.
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.. attribute:: slug_url_kwarg
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.. versionadded:: 1.4
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The name of the URLConf keyword argument that contains the slug. By
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default, ``slug_url_kwarg`` is ``'slug'``.
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.. attribute:: pk_url_kwarg
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.. versionadded:: 1.4
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The name of the URLConf keyword argument that contains the primary key.
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By default, ``pk_url_kwarg`` is ``'pk'``.
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.. attribute:: context_object_name
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Designates the name of the variable to use in the context.
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.. method:: get_object(queryset=None)
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Returns the single object that this view will display. If
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``queryset`` is provided, that queryset will be used as the
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source of objects; otherwise,
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:meth:`~SingleObjectMixin.get_queryset` will be used.
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``get_object()`` looks for a
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:attr:`SingleObjectMixin.pk_url_kwarg` argument in the arguments
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to the view; if this argument is found, this method performs a
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primary-key based lookup using that value. If this argument is not
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found, it looks for a :attr:`SingleObjectMixin.slug_url_kwarg`
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argument, and performs a slug lookup using the
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:attr:`SingleObjectMixin.slug_field`.
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.. method:: get_queryset()
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Returns the queryset that will be used to retrieve the object that
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this view will display. By default,
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:meth:`~SingleObjectMixin.get_queryset` returns the value of the
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:attr:`~SingleObjectMixin.queryset` attribute if it is set, otherwise
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it constructs a :class:`QuerySet` by calling the `all()` method on the
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:attr:`~SingleObjectMixin.model` attribute's default manager.
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.. method:: get_context_object_name(obj)
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Return the context variable name that will be used to contain the
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data that this view is manipulating. If
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:attr:`~SingleObjectMixin.context_object_name` is not set, the context
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name will be constructed from the ``object_name`` of the model that
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the queryset is composed from. For example, the model ``Article``
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would have context object named ``'article'``.
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.. method:: get_context_data(**kwargs)
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Returns context data for displaying the list of objects.
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**Context**
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* ``object``: The object that this view is displaying. If
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``context_object_name`` is specified, that variable will also be
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set in the context, with the same value as ``object``.
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.. class:: django.views.generic.detail.SingleObjectTemplateResponseMixin
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A mixin class that performs template-based response rendering for views
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that operate upon a single object instance. Requires that the view it is
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mixed with provides ``self.object``, the object instance that the view is
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operating on. ``self.object`` will usually be, but is not required to be,
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an instance of a Django model. It may be ``None`` if the view is in the
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process of constructing a new instance.
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**Extends**
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* :class:`~django.views.generic.base.TemplateResponseMixin`
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**Methods and Attributes**
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.. attribute:: template_name_field
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The field on the current object instance that can be used to determine
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the name of a candidate template. If either ``template_name_field``
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itself or the value of the ``template_name_field`` on the current
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object instance is ``None``, the object will not be used for a
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candidate template name.
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.. attribute:: template_name_suffix
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The suffix to append to the auto-generated candidate template name.
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Default suffix is ``_detail``.
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.. method:: get_template_names()
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Returns a list of candidate template names. Returns the following list:
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* the value of ``template_name`` on the view (if provided)
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* the contents of the ``template_name_field`` field on the
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object instance that the view is operating upon (if available)
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* ``<app_label>/<object_name><template_name_suffix>.html``
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