=====================
Generic editing views
=====================

The following views are described on this page and provide a foundation for 
editing content:

* :class:`django.views.generic.edit.FormView`
* :class:`django.views.generic.edit.CreateView`
* :class:`django.views.generic.edit.UpdateView`
* :class:`django.views.generic.edit.DeleteView`

.. note::

    Some of the examples on this page assume that a model titled 'Author'
    has been defined. For these cases we assume the following has been defined 
    in `myapp/models.py`::

        from django import models
        from django.core.urlresolvers import reverse

        class Author(models.Model):
            name = models.CharField(max_length=200)

            def get_absolute_url(self):
                return reverse('author-detail', kwargs={'pk': self.pk})

.. class:: django.views.generic.edit.FormView

    A view that displays a form. On error, redisplays the form with validation
    errors; on success, redirects to a new URL.

    **Ancestors (MRO)**

    This view inherits methods and attributes from the following views:

    * :class:`django.views.generic.edit.FormView`
    * :class:`django.views.generic.base.TemplateResponseMixin`
    * :class:`django.views.generic.edit.BaseFormView`
    * :class:`django.views.generic.edit.FormMixin`
    * :class:`django.views.generic.edit.ProcessFormView`
    * :class:`django.views.generic.base.View`

    **Example forms.py**::

        from django import forms

        class ContactForm(forms.Form):
            name = forms.CharField()
            message = forms.CharField(widget=forms.Textarea)

            def send_email(self):
                # send email using the self.cleaned_data dictionary
                pass

    **Example views.py**::

        from myapp.forms import ContactForm
        from django.views.generic.edit import FormView

        class ContactView(FormView):
            template_name = 'contact.html'
            form_class = ContactForm
            success_url = '/thanks/'

            def form_valid(self, form):
                # This method is called when valid form data has been POSTed.
                # It should return an HttpResponse.
                form.send_email()
                return super(ContactView, self).form_valid(form)


.. class:: django.views.generic.edit.CreateView

    A view that displays a form for creating an object, redisplaying the form
    with validation errors (if there are any) and saving the object.

    **Ancestors (MRO)**

    This view inherits methods and attributes from the following views:

    * :class:`django.views.generic.edit.CreateView`
    * :class:`django.views.generic.detail.SingleObjectTemplateResponseMixin`
    * :class:`django.views.generic.base.TemplateResponseMixin`
    * :class:`django.views.generic.edit.BaseCreateView`
    * :class:`django.views.generic.edit.ModelFormMixin`
    * :class:`django.views.generic.edit.FormMixin`
    * :class:`django.views.generic.detail.SingleObjectMixin`
    * :class:`django.views.generic.edit.ProcessFormView`
    * :class:`django.views.generic.base.View`

    **Attributes**

    .. attribute:: template_name_suffix

        The CreateView page displayed to a GET request uses a
        ``template_name_suffix`` of ``'_form.html'``. For 
        example, changing this attribute to ``'_create_form.html'`` for a view
        creating objects for the the example `Author` model would cause the the
        default `template_name` to be ``'myapp/author_create_form.html'``.

    **Example views.py**::

        from django.views.generic.edit import CreateView
        from myapp.models import Author

        class AuthorCreate(CreateView):
            model = Author

.. class:: django.views.generic.edit.UpdateView

    A view that displays a form for editing an existing object, redisplaying
    the form with validation errors (if there are any) and saving changes to
    the object. This uses a form automatically generated from the object's
    model class (unless a form class is manually specified).

    **Ancestors (MRO)**

    This view inherits methods and attributes from the following views:

    * :class:`django.views.generic.edit.UpdateView`
    * :class:`django.views.generic.detail.SingleObjectTemplateResponseMixin`
    * :class:`django.views.generic.base.TemplateResponseMixin`
    * :class:`django.views.generic.edit.BaseUpdateView`
    * :class:`django.views.generic.edit.ModelFormMixin`
    * :class:`django.views.generic.edit.FormMixin`
    * :class:`django.views.generic.detail.SingleObjectMixin`
    * :class:`django.views.generic.edit.ProcessFormView`
    * :class:`django.views.generic.base.View`

    **Attributes**

    .. attribute:: template_name_suffix

        The UpdateView page displayed to a GET request uses a
        ``template_name_suffix`` of ``'_form.html'``. For 
        example, changing this attribute to ``'_update_form.html'`` for a view
        updating objects for the the example `Author` model would cause the the
        default `template_name` to be ``'myapp/author_update_form.html'``.        

    **Example views.py**::

        from django.views.generic.edit import UpdateView
        from myapp.models import Author

        class AuthorUpdate(UpdateView):
            model = Author

.. class:: django.views.generic.edit.DeleteView

    A view that displays a confirmation page and deletes an existing object.
    The given object will only be deleted if the request method is ``POST``. If
    this view is fetched via ``GET``, it will display a confirmation page that
    should contain a form that POSTs to the same URL.

    **Ancestors (MRO)**

    This view inherits methods and attributes from the following views:

    * :class:`django.views.generic.edit.DeleteView`
    * :class:`django.views.generic.detail.SingleObjectTemplateResponseMixin`
    * :class:`django.views.generic.base.TemplateResponseMixin`
    * :class:`django.views.generic.edit.BaseDeleteView`
    * :class:`django.views.generic.edit.DeletionMixin`
    * :class:`django.views.generic.detail.BaseDetailView`
    * :class:`django.views.generic.detail.SingleObjectMixin`
    * :class:`django.views.generic.base.View`

    **Attributes**

    .. attribute:: template_name_suffix

        The DeleteView page displayed to a GET request uses a
        ``template_name_suffix`` of ``'_confirm_delete.html'``. For 
        example, changing this attribute to ``'_check_delete.html'`` for a view
        deleting objects for the the example `Author` model would cause the the
        default `template_name` to be ``'myapp/author_check_delete.html'``.        


    **Example views.py**::

        from django.views.generic.edit import DeleteView
        from django.core.urlresolvers import reverse_lazy
        from myapp.models import Author

        class AuthorDelete(DeleteView):
            model = Author
            success_url = reverse_lazy('author-list')