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220 lines
6.7 KiB
Plaintext
220 lines
6.7 KiB
Plaintext
==============
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Editing mixins
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==============
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The following mixins are used to construct Django's editing views:
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* :class:`django.views.generic.edit.FormMixin`
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* :class:`django.views.generic.edit.ModelFormMixin`
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* :class:`django.views.generic.edit.ProcessFormView`
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* :class:`django.views.generic.edit.DeletionMixin`
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.. note::
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Examples of how these are combined into editing views can be found at
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the documentation on ``Generic editing views``.
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FormMixin
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---------
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.. class:: django.views.generic.edit.FormMixin
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A mixin class that provides facilities for creating and displaying forms.
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**Methods and Attributes**
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.. attribute:: initial
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A dictionary containing initial data for the form.
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.. attribute:: form_class
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The form class to instantiate.
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.. attribute:: success_url
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The URL to redirect to when the form is successfully processed.
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.. method:: get_initial()
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Retrieve initial data for the form. By default, returns a copy of
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:attr:`~django.views.generic.edit.FormMixin.initial`.
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.. method:: get_form_class()
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Retrieve the form class to instantiate. By default
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:attr:`.form_class`.
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.. method:: get_form(form_class)
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Instantiate an instance of ``form_class`` using
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:meth:`~django.views.generic.edit.FormMixin.get_form_kwargs`.
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.. method:: get_form_kwargs()
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Build the keyword arguments required to instantiate the form.
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The ``initial`` argument is set to :meth:`.get_initial`. If the
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request is a ``POST`` or ``PUT``, the request data (``request.POST``
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and ``request.FILES``) will also be provided.
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.. method:: get_success_url()
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Determine the URL to redirect to when the form is successfully
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validated. Returns
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:attr:`~django.views.generic.edit.FormMixin.success_url` by default.
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.. method:: form_valid(form)
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Redirects to
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:meth:`~django.views.generic.edit.FormMixin.get_success_url`.
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.. method:: form_invalid(form)
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Renders a response, providing the invalid form as context.
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.. method:: get_context_data(**kwargs)
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Populates a context containing the contents of ``kwargs``.
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**Context**
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* ``form``: The form instance that was generated for the view.
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.. note::
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Views mixing ``FormMixin`` must provide an implementation of
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:meth:`form_valid` and :meth:`form_invalid`.
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ModelFormMixin
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--------------
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.. class:: django.views.generic.edit.ModelFormMixin
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A form mixin that works on ``ModelForms``, rather than a standalone form.
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Since this is a subclass of
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:class:`~django.views.generic.detail.SingleObjectMixin`, instances of this
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mixin have access to the
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:attr:`~django.views.generic.detail.SingleObjectMixin.model` and
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:attr:`~django.views.generic.detail.SingleObjectMixin.queryset` attributes,
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describing the type of object that the ``ModelForm`` is manipulating. The
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view also provides ``self.object``, the instance being manipulated. If the
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instance is being created, ``self.object`` will be ``None``.
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**Mixins**
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* :class:`django.views.generic.edit.FormMixin`
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* :class:`django.views.generic.detail.SingleObjectMixin`
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**Methods and Attributes**
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.. attribute:: model
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A model class. Can be explicitly provided, otherwise will be determined
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by examining ``self.object`` or
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:attr:`~django.views.generic.detail.SingleObjectMixin.queryset`.
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.. attribute:: success_url
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The URL to redirect to when the form is successfully processed.
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``success_url`` may contain dictionary string formatting, which
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will be interpolated against the object's field attributes. For
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example, you could use ``success_url="/polls/%(slug)s/"`` to
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redirect to a URL composed out of the ``slug`` field on a model.
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.. method:: get_form_class()
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Retrieve the form class to instantiate. If
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:attr:`~django.views.generic.edit.FormMixin.form_class` is provided,
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that class will be used. Otherwise, a ``ModelForm`` will be
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instantiated using the model associated with the
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:attr:`~django.views.generic.detail.SingleObjectMixin.queryset`, or
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with the :attr:`~django.views.generic.detail.SingleObjectMixin.model`,
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depending on which attribute is provided.
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.. method:: get_form_kwargs()
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Add the current instance (``self.object``) to the standard
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:meth:`~django.views.generic.edit.FormMixin.get_form_kwargs`.
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.. method:: get_success_url()
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Determine the URL to redirect to when the form is successfully
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validated. Returns
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:attr:`django.views.generic.edit.ModelFormMixin.success_url` if it is
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provided; otherwise, attempts to use the ``get_absolute_url()`` of the
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object.
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.. method:: form_valid(form)
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Saves the form instance, sets the current object for the view, and
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redirects to
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:meth:`~django.views.generic.edit.FormMixin.get_success_url`.
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.. method:: form_invalid()
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Renders a response, providing the invalid form as context.
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ProcessFormView
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---------------
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.. class:: django.views.generic.edit.ProcessFormView
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A mixin that provides basic HTTP GET and POST workflow.
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.. note::
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This is named 'ProcessFormView' and inherits directly from
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:class:`django.views.generic.base.View`, but breaks if used
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independently, so it is more of a mixin.
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**Extends**
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* :class:`django.views.generic.base.View`
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**Methods and Attributes**
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.. method:: get(request, *args, **kwargs)
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Constructs a form, then renders a response using a context that
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contains that form.
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.. method:: post(request, *args, **kwargs)
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Constructs a form, checks the form for validity, and handles it
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accordingly.
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.. method:: put(*args, **kwargs)
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The ``PUT`` action is also handled and just passes all parameters
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through to :meth:`post`.
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.. class:: django.views.generic.edit.DeletionMixin
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Enables handling of the ``DELETE`` http action.
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**Methods and Attributes**
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.. attribute:: success_url
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The url to redirect to when the nominated object has been
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successfully deleted.
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.. versionadded:: 1.6
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``success_url`` may contain dictionary string formatting, which
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will be interpolated against the object's field attributes. For
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example, you could use ``success_url="/parent/%(parent_id)s/"`` to
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redirect to a URL composed out of the ``parent_id`` field on a model.
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.. method:: get_success_url()
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Returns the url to redirect to when the nominated object has been
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successfully deleted. Returns
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:attr:`~django.views.generic.edit.DeletionMixin.success_url` by
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default.
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