105 lines
3.8 KiB
Plaintext
105 lines
3.8 KiB
Plaintext
=============
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Simple mixins
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=============
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ContextMixin
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------------
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.. class:: django.views.generic.base.ContextMixin
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.. versionadded:: 1.5
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**Methods**
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.. method:: get_context_data(**kwargs)
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Returns a dictionary representing the template context. The keyword
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arguments provided will make up the returned context. Example usage::
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def get_context_data(self, **kwargs):
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context = super(RandomNumberView, self).get_context_data(**kwargs)
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context['number'] = random.randrange(1, 100)
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return context
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The template context of all class-based generic views include a
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``view`` variable that points to the ``View`` instance.
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.. admonition:: Use ``alters_data`` where appropriate
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Note that having the view instance in the template context may
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expose potentially hazardous methods to template authors. To
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prevent methods like this from being called in the template, set
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``alters_data=True`` on those methods. For more information, read
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the documentation on :ref:`rendering a template context
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<alters-data-description>`.
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TemplateResponseMixin
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---------------------
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.. class:: django.views.generic.base.TemplateResponseMixin
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Provides a mechanism to construct a
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:class:`~django.template.response.TemplateResponse`, given
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suitable context. The template to use is configurable and can be
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further customized by subclasses.
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**Attributes**
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.. attribute:: template_name
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The full name of a template to use as defined by a string. Not defining
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a ``template_name`` will raise a
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:class:`django.core.exceptions.ImproperlyConfigured` exception.
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.. attribute:: response_class
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The response class to be returned by ``render_to_response`` method.
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Default is
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:class:`TemplateResponse <django.template.response.TemplateResponse>`.
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The template and context of ``TemplateResponse`` instances can be
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altered later (e.g. in
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:ref:`template response middleware <template-response-middleware>`).
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.. admonition:: Context processors
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``TemplateResponse`` uses :class:`~django.template.RequestContext`
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which means that callables defined in
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:setting:`TEMPLATE_CONTEXT_PROCESSORS` may overwrite template
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variables defined in your views. For example, if you subclass
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:class:`DetailView <django.views.generic.detail.DetailView>` and
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set ``context_object_name`` to ``user``, the
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``django.contrib.auth.context_processors.auth`` context processor
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will happily overwrite your variable with current user.
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If you need custom template loading or custom context object
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instantiation, create a ``TemplateResponse`` subclass and assign it to
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``response_class``.
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.. attribute:: content_type
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.. versionadded:: 1.5
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The content type to use for the response. ``content_type`` is passed
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as a keyword argument to ``response_class``. Default is ``None`` --
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meaning that Django uses :setting:`DEFAULT_CONTENT_TYPE`.
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**Methods**
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.. method:: render_to_response(context, **response_kwargs)
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Returns a ``self.response_class`` instance.
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If any keyword arguments are provided, they will be passed to the
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constructor of the response class.
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Calls :meth:`get_template_names()` to obtain the list of template names
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that will be searched looking for an existent template.
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.. method:: get_template_names()
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Returns a list of template names to search for when rendering the
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template.
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If :attr:`template_name` is specified, the default implementation will
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return a list containing :attr:`template_name` (if it is specified).
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