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This patch does not remove all occurrences of the words in question. Rather, I went through all of the occurrences of the words listed below, and judged if they a) suggested the reader had some kind of knowledge/experience, and b) if they added anything of value (including tone of voice, etc). I left most of the words alone. I looked at the following words: - simply/simple - easy/easier/easiest - obvious - just - merely - straightforward - ridiculous Thanks to Carlton Gibson for guidance on how to approach this issue, and to Tim Bell for providing the idea. But the enormous lion's share of thanks go to Adam Johnson for his patient and helpful review.
246 lines
7.7 KiB
Plaintext
246 lines
7.7 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 :doc:`/ref/class-based-views/generic-editing`.
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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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**Mixins**
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* :class:`django.views.generic.base.ContextMixin`
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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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.. attribute:: prefix
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The :attr:`~django.forms.Form.prefix` for the generated form.
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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=None)
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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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If ``form_class`` isn't provided :meth:`get_form_class` will be used.
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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_prefix()
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Determine the :attr:`~django.forms.Form.prefix` for the generated form.
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Returns :attr:`~django.views.generic.edit.FormMixin.prefix` by default.
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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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Calls :meth:`get_form` and adds the result to the context data with the
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name 'form'.
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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.
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If you specify both the
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:attr:`~django.views.generic.edit.ModelFormMixin.fields` and
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:attr:`~django.views.generic.edit.FormMixin.form_class` attributes, an
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:exc:`~django.core.exceptions.ImproperlyConfigured` exception will be
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raised.
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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:: fields
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A list of names of fields. This is interpreted the same way as the
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``Meta.fields`` attribute of :class:`~django.forms.ModelForm`.
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This is a required attribute if you are generating the form class
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automatically (e.g. using ``model``). Omitting this attribute will
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result in an :exc:`~django.core.exceptions.ImproperlyConfigured`
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exception.
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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}/"`` 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(form)
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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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Renders a response using a context created with
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:meth:`~django.views.generic.edit.FormMixin.get_context_data`.
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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 passes all parameters through to
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:meth:`post`.
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``DeletionMixin``
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=================
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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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``success_url`` may contain dictionary string formatting, which will be
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interpolated against the object's field attributes. For example, you
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could use ``success_url="/parent/{parent_id}/"`` to redirect to a URL
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composed out of the ``parent_id`` field on a model.
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.. method:: delete(request, *args, **kwargs)
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Retrieves the target object and calls its ``delete()`` method, then
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redirects to the success URL.
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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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