class WizardView

from django.contrib.formtools.wizard.views import WizardView
The WizardView is used to create multi-page forms and handles all the
storage and validation stuff. The wizard is based on Django's generic
class based views.

Attributes

  Defined in
condition_dict = None WizardView
form_list = None WizardView
http_method_names = ['get', 'post', 'put', 'delete', 'head', 'options', 'trace'] View
initial_dict = None WizardView
instance_dict = None WizardView
response_class = <class 'django.template.response.TemplateResponse'> TemplateResponseMixin
storage_name = None WizardView
template_name = 'formtools/wizard/wizard_form.html' WizardView
template_name = None TemplateResponseMixin
Expand Collapse

Methods

def as_view(cls, *args, **kwargs):

WizardView

This method is used within urls.py to create unique wizardview
instances for every request. We need to override this method because
we add some kwargs which are needed to make the wizardview usable.
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@classonlymethod
def as_view(cls, *args, **kwargs):
    """
    This method is used within urls.py to create unique wizardview
    instances for every request. We need to override this method because
    we add some kwargs which are needed to make the wizardview usable.
    """
    initkwargs = cls.get_initkwargs(*args, **kwargs)
    return super(WizardView, cls).as_view(**initkwargs)

View

Main entry point for a request-response process.
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@classonlymethod
def as_view(cls, **initkwargs):
    """
    Main entry point for a request-response process.
    """
    # sanitize keyword arguments
    for key in initkwargs:
        if key in cls.http_method_names:
            raise TypeError(u"You tried to pass in the %s method name as a "
                            u"keyword argument to %s(). Don't do that."
                            % (key, cls.__name__))
        if not hasattr(cls, key):
            raise TypeError(u"%s() received an invalid keyword %r" % (
                cls.__name__, key))
    def view(request, *args, **kwargs):
        self = cls(**initkwargs)
        if hasattr(self, 'get') and not hasattr(self, 'head'):
            self.head = self.get
        return self.dispatch(request, *args, **kwargs)
    # take name and docstring from class
    update_wrapper(view, cls, updated=())
    # and possible attributes set by decorators
    # like csrf_exempt from dispatch
    update_wrapper(view, cls.dispatch, assigned=())
    return view

def dispatch(self, request, *args, **kwargs):

WizardView

This method gets called by the routing engine. The first argument is
`request` which contains a `HttpRequest` instance.
The request is stored in `self.request` for later use. The storage
instance is stored in `self.storage`.

After processing the request using the `dispatch` method, the
response gets updated by the storage engine (for example add cookies).
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def dispatch(self, request, *args, **kwargs):
    """
    This method gets called by the routing engine. The first argument is
    `request` which contains a `HttpRequest` instance.
    The request is stored in `self.request` for later use. The storage
    instance is stored in `self.storage`.
    After processing the request using the `dispatch` method, the
    response gets updated by the storage engine (for example add cookies).
    """
    # add the storage engine to the current wizardview instance
    self.prefix = self.get_prefix(*args, **kwargs)
    self.storage = get_storage(self.storage_name, self.prefix, request,
        getattr(self, 'file_storage', None))
    self.steps = StepsHelper(self)
    response = super(WizardView, self).dispatch(request, *args, **kwargs)
    # update the response (e.g. adding cookies)
    self.storage.update_response(response)
    return response

View

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def dispatch(self, request, *args, **kwargs):
    # Try to dispatch to the right method; if a method doesn't exist,
    # defer to the error handler. Also defer to the error handler if the
    # request method isn't on the approved list.
    if request.method.lower() in self.http_method_names:
        handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
    else:
        handler = self.http_method_not_allowed
    self.request = request
    self.args = args
    self.kwargs = kwargs
    return handler(request, *args, **kwargs)

def done(self, form_list, **kwargs): WizardView

This method must be overridden by a subclass to process to form data
after processing all steps.
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def done(self, form_list, **kwargs):
    """
    This method must be overridden by a subclass to process to form data
    after processing all steps.
    """
    raise NotImplementedError("Your %s class has not defined a done() "
        "method, which is required." % self.__class__.__name__)

def get(self, request, *args, **kwargs):

WizardView

This method handles GET requests.

If a GET request reaches this point, the wizard assumes that the user
just starts at the first step or wants to restart the process.
The data of the wizard will be resetted before rendering the first step.
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def get(self, request, *args, **kwargs):
    """
    This method handles GET requests.
    If a GET request reaches this point, the wizard assumes that the user
    just starts at the first step or wants to restart the process.
    The data of the wizard will be resetted before rendering the first step.
    """
    self.storage.reset()
    # reset the current step to the first step.
    self.storage.current_step = self.steps.first
    return self.render(self.get_form())

TemplateView

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def get(self, request, *args, **kwargs):
    context = self.get_context_data(**kwargs)
    return self.render_to_response(context)

def get_all_cleaned_data(self): WizardView

Returns a merged dictionary of all step cleaned_data dictionaries.
If a step contains a `FormSet`, the key will be prefixed with formset
and contain a list of the formset cleaned_data dictionaries.
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def get_all_cleaned_data(self):
    """
    Returns a merged dictionary of all step cleaned_data dictionaries.
    If a step contains a `FormSet`, the key will be prefixed with formset
    and contain a list of the formset cleaned_data dictionaries.
    """
    cleaned_data = {}
    for form_key in self.get_form_list():
        form_obj = self.get_form(
            step=form_key,
            data=self.storage.get_step_data(form_key),
            files=self.storage.get_step_files(form_key)
        )
        if form_obj.is_valid():
            if isinstance(form_obj.cleaned_data, (tuple, list)):
                cleaned_data.update({
                    'formset-%s' % form_key: form_obj.cleaned_data
                })
            else:
                cleaned_data.update(form_obj.cleaned_data)
    return cleaned_data

def get_cleaned_data_for_step(self, step): WizardView

Returns the cleaned data for a given `step`. Before returning the
cleaned data, the stored values are being revalidated through the
form. If the data doesn't validate, None will be returned.
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def get_cleaned_data_for_step(self, step):
    """
    Returns the cleaned data for a given `step`. Before returning the
    cleaned data, the stored values are being revalidated through the
    form. If the data doesn't validate, None will be returned.
    """
    if step in self.form_list:
        form_obj = self.get_form(step=step,
            data=self.storage.get_step_data(step),
            files=self.storage.get_step_files(step))
        if form_obj.is_valid():
            return form_obj.cleaned_data
    return None

def get_context_data(self, form, **kwargs):

WizardView

Returns the template context for a step. You can overwrite this method
to add more data for all or some steps. This method returns a
dictionary containing the rendered form step. Available template
context variables are:

 * all extra data stored in the storage backend
 * `form` - form instance of the current step
 * `wizard` - the wizard instance itself

Example:

.. code-block:: python

    class MyWizard(WizardView):
        def get_context_data(self, form, **kwargs):
            context = super(MyWizard, self).get_context_data(form=form, **kwargs)
            if self.steps.current == 'my_step_name':
                context.update({'another_var': True})
            return context
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def get_context_data(self, form, **kwargs):
    """
    Returns the template context for a step. You can overwrite this method
    to add more data for all or some steps. This method returns a
    dictionary containing the rendered form step. Available template
    context variables are:
     * all extra data stored in the storage backend
     * `form` - form instance of the current step
     * `wizard` - the wizard instance itself
    Example:
    .. code-block:: python
        class MyWizard(WizardView):
            def get_context_data(self, form, **kwargs):
                context = super(MyWizard, self).get_context_data(form=form, **kwargs)
                if self.steps.current == 'my_step_name':
                    context.update({'another_var': True})
                return context
    """
    context = super(WizardView, self).get_context_data(**kwargs)
    context.update(self.storage.extra_data)
    context['wizard'] = {
        'form': form,
        'steps': self.steps,
        'management_form': ManagementForm(prefix=self.prefix, initial={
            'current_step': self.steps.current,
        }),
    }
    return context

TemplateView

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def get_context_data(self, **kwargs):
    return {
        'params': kwargs
    }

def get_form(self, step=None, data=None, files=None): WizardView

Constructs the form for a given `step`. If no `step` is defined, the
current step will be determined automatically.

The form will be initialized using the `data` argument to prefill the
new form. If needed, instance or queryset (for `ModelForm` or
`ModelFormSet`) will be added too.
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def get_form(self, step=None, data=None, files=None):
    """
    Constructs the form for a given `step`. If no `step` is defined, the
    current step will be determined automatically.
    The form will be initialized using the `data` argument to prefill the
    new form. If needed, instance or queryset (for `ModelForm` or
    `ModelFormSet`) will be added too.
    """
    if step is None:
        step = self.steps.current
    # prepare the kwargs for the form instance.
    kwargs = self.get_form_kwargs(step)
    kwargs.update({
        'data': data,
        'files': files,
        'prefix': self.get_form_prefix(step, self.form_list[step]),
        'initial': self.get_form_initial(step),
    })
    if issubclass(self.form_list[step], forms.ModelForm):
        # If the form is based on ModelForm, add instance if available
        # and not previously set.
        kwargs.setdefault('instance', self.get_form_instance(step))
    elif issubclass(self.form_list[step], forms.models.BaseModelFormSet):
        # If the form is based on ModelFormSet, add queryset if available
        # and not previous set.
        kwargs.setdefault('queryset', self.get_form_instance(step))
    return self.form_list[step](**kwargs)

def get_form_initial(self, step): WizardView

Returns a dictionary which will be passed to the form for `step`
as `initial`. If no initial data was provied while initializing the
form wizard, a empty dictionary will be returned.
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def get_form_initial(self, step):
    """
    Returns a dictionary which will be passed to the form for `step`
    as `initial`. If no initial data was provied while initializing the
    form wizard, a empty dictionary will be returned.
    """
    return self.initial_dict.get(step, {})

def get_form_instance(self, step): WizardView

Returns a object which will be passed to the form for `step`
as `instance`. If no instance object was provied while initializing
the form wizard, None will be returned.
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def get_form_instance(self, step):
    """
    Returns a object which will be passed to the form for `step`
    as `instance`. If no instance object was provied while initializing
    the form wizard, None will be returned.
    """
    return self.instance_dict.get(step, None)

def get_form_kwargs(self, step=None): WizardView

Returns the keyword arguments for instantiating the form
(or formset) on the given step.
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def get_form_kwargs(self, step=None):
    """
    Returns the keyword arguments for instantiating the form
    (or formset) on the given step.
    """
    return {}

def get_form_list(self): WizardView

This method returns a form_list based on the initial form list but
checks if there is a condition method/value in the condition_list.
If an entry exists in the condition list, it will call/read the value
and respect the result. (True means add the form, False means ignore
the form)

The form_list is always generated on the fly because condition methods
could use data from other (maybe previous forms).
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def get_form_list(self):
    """
    This method returns a form_list based on the initial form list but
    checks if there is a condition method/value in the condition_list.
    If an entry exists in the condition list, it will call/read the value
    and respect the result. (True means add the form, False means ignore
    the form)
    The form_list is always generated on the fly because condition methods
    could use data from other (maybe previous forms).
    """
    form_list = SortedDict()
    for form_key, form_class in self.form_list.iteritems():
        # try to fetch the value from condition list, by default, the form
        # gets passed to the new list.
        condition = self.condition_dict.get(form_key, True)
        if callable(condition):
            # call the value if needed, passes the current instance.
            condition = condition(self)
        if condition:
            form_list[form_key] = form_class
    return form_list

def get_form_prefix(self, step=None, form=None): WizardView

Returns the prefix which will be used when calling the actual form for
the given step. `step` contains the step-name, `form` the form which
will be called with the returned prefix.

If no step is given, the form_prefix will determine the current step
automatically.
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def get_form_prefix(self, step=None, form=None):
    """
    Returns the prefix which will be used when calling the actual form for
    the given step. `step` contains the step-name, `form` the form which
    will be called with the returned prefix.
    If no step is given, the form_prefix will determine the current step
    automatically.
    """
    if step is None:
        step = self.steps.current
    return str(step)

def get_form_step_data(self, form): WizardView

Is used to return the raw form data. You may use this method to
manipulate the data.
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def get_form_step_data(self, form):
    """
    Is used to return the raw form data. You may use this method to
    manipulate the data.
    """
    return form.data

def get_form_step_files(self, form): WizardView

Is used to return the raw form files. You may use this method to
manipulate the data.
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def get_form_step_files(self, form):
    """
    Is used to return the raw form files. You may use this method to
    manipulate the data.
    """
    return form.files

def get_initkwargs(cls, form_list, initial_dict=None, instance_dict=None, condition_dict=None, *args, **kwargs): WizardView

Creates a dict with all needed parameters for the form wizard instances.

* `form_list` - is a list of forms. The list entries can be single form
  classes or tuples of (`step_name`, `form_class`). If you pass a list
  of forms, the wizardview will convert the class list to
  (`zero_based_counter`, `form_class`). This is needed to access the
  form for a specific step.
* `initial_dict` - contains a dictionary of initial data dictionaries.
  The key should be equal to the `step_name` in the `form_list` (or
  the str of the zero based counter - if no step_names added in the
  `form_list`)
* `instance_dict` - contains a dictionary of instance objects. This
  is only used when `ModelForm`s are used. The key should be equal to
  the `step_name` in the `form_list`. Same rules as for `initial_dict`
  apply.
* `condition_dict` - contains a dictionary of boolean values or
  callables. If the value of for a specific `step_name` is callable it
  will be called with the wizardview instance as the only argument.
  If the return value is true, the step's form will be used.
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@classmethod
def get_initkwargs(cls, form_list, initial_dict=None,
        instance_dict=None, condition_dict=None, *args, **kwargs):
    """
    Creates a dict with all needed parameters for the form wizard instances.
    * `form_list` - is a list of forms. The list entries can be single form
      classes or tuples of (`step_name`, `form_class`). If you pass a list
      of forms, the wizardview will convert the class list to
      (`zero_based_counter`, `form_class`). This is needed to access the
      form for a specific step.
    * `initial_dict` - contains a dictionary of initial data dictionaries.
      The key should be equal to the `step_name` in the `form_list` (or
      the str of the zero based counter - if no step_names added in the
      `form_list`)
    * `instance_dict` - contains a dictionary of instance objects. This
      is only used when `ModelForm`s are used. The key should be equal to
      the `step_name` in the `form_list`. Same rules as for `initial_dict`
      apply.
    * `condition_dict` - contains a dictionary of boolean values or
      callables. If the value of for a specific `step_name` is callable it
      will be called with the wizardview instance as the only argument.
      If the return value is true, the step's form will be used.
    """
    kwargs.update({
        'initial_dict': initial_dict or {},
        'instance_dict': instance_dict or {},
        'condition_dict': condition_dict or {},
    })
    init_form_list = SortedDict()
    assert len(form_list) > 0, 'at least one form is needed'
    # walk through the passed form list
    for i, form in enumerate(form_list):
        if isinstance(form, (list, tuple)):
            # if the element is a tuple, add the tuple to the new created
            # sorted dictionary.
            init_form_list[unicode(form[0])] = form[1]
        else:
            # if not, add the form with a zero based counter as unicode
            init_form_list[unicode(i)] = form
    # walk through the new created list of forms
    for form in init_form_list.itervalues():
        if issubclass(form, formsets.BaseFormSet):
            # if the element is based on BaseFormSet (FormSet/ModelFormSet)
            # we need to override the form variable.
            form = form.form
        # check if any form contains a FileField, if yes, we need a
        # file_storage added to the wizardview (by subclassing).
        for field in form.base_fields.itervalues():
            if (isinstance(field, forms.FileField) and
                    not hasattr(cls, 'file_storage')):
                raise NoFileStorageConfigured
    # build the kwargs for the wizardview instances
    kwargs['form_list'] = init_form_list
    return kwargs

def get_next_step(self, step=None): WizardView

Returns the next step after the given `step`. If no more steps are
available, None will be returned. If the `step` argument is None, the
current step will be determined automatically.
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def get_next_step(self, step=None):
    """
    Returns the next step after the given `step`. If no more steps are
    available, None will be returned. If the `step` argument is None, the
    current step will be determined automatically.
    """
    if step is None:
        step = self.steps.current
    form_list = self.get_form_list()
    key = form_list.keyOrder.index(step) + 1
    if len(form_list.keyOrder) > key:
        return form_list.keyOrder[key]
    return None

def get_prefix(self, *args, **kwargs): WizardView

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def get_prefix(self, *args, **kwargs):
    # TODO: Add some kind of unique id to prefix
    return normalize_name(self.__class__.__name__)

def get_prev_step(self, step=None): WizardView

Returns the previous step before the given `step`. If there are no
steps available, None will be returned. If the `step` argument is
None, the current step will be determined automatically.
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def get_prev_step(self, step=None):
    """
    Returns the previous step before the given `step`. If there are no
    steps available, None will be returned. If the `step` argument is
    None, the current step will be determined automatically.
    """
    if step is None:
        step = self.steps.current
    form_list = self.get_form_list()
    key = form_list.keyOrder.index(step) - 1
    if key >= 0:
        return form_list.keyOrder[key]
    return None

def get_step_index(self, step=None): WizardView

Returns the index for the given `step` name. If no step is given,
the current step will be used to get the index.
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def get_step_index(self, step=None):
    """
    Returns the index for the given `step` name. If no step is given,
    the current step will be used to get the index.
    """
    if step is None:
        step = self.steps.current
    return self.get_form_list().keyOrder.index(step)

def get_template_names(self): TemplateResponseMixin

Returns a list of template names to be used for the request. Must return
a list. May not be called if render_to_response is overridden.
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def get_template_names(self):
    """
    Returns a list of template names to be used for the request. Must return
    a list. May not be called if render_to_response is overridden.
    """
    if self.template_name is None:
        raise ImproperlyConfigured(
            "TemplateResponseMixin requires either a definition of "
            "'template_name' or an implementation of 'get_template_names()'")
    else:
        return [self.template_name]

def http_method_not_allowed(self, request, *args, **kwargs): View

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def http_method_not_allowed(self, request, *args, **kwargs):
    allowed_methods = [m for m in self.http_method_names if hasattr(self, m)]
    logger.warning('Method Not Allowed (%s): %s', request.method, request.path,
        extra={
            'status_code': 405,
            'request': self.request
        }
    )
    return http.HttpResponseNotAllowed(allowed_methods)

def __init__(self, **kwargs): View

Constructor. Called in the URLconf; can contain helpful extra
keyword arguments, and other things.
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def __init__(self, **kwargs):
    """
    Constructor. Called in the URLconf; can contain helpful extra
    keyword arguments, and other things.
    """
    # Go through keyword arguments, and either save their values to our
    # instance, or raise an error.
    for key, value in kwargs.iteritems():
        setattr(self, key, value)

def post(self, *args, **kwargs): WizardView

This method handles POST requests.

The wizard will render either the current step (if form validation
wasn't successful), the next step (if the current step was stored
successful) or the done view (if no more steps are available)
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def post(self, *args, **kwargs):
    """
    This method handles POST requests.
    The wizard will render either the current step (if form validation
    wasn't successful), the next step (if the current step was stored
    successful) or the done view (if no more steps are available)
    """
    # Look for a wizard_goto_step element in the posted data which
    # contains a valid step name. If one was found, render the requested
    # form. (This makes stepping back a lot easier).
    wizard_goto_step = self.request.POST.get('wizard_goto_step', None)
    if wizard_goto_step and wizard_goto_step in self.get_form_list():
        self.storage.current_step = wizard_goto_step
        form = self.get_form(
            data=self.storage.get_step_data(self.steps.current),
            files=self.storage.get_step_files(self.steps.current))
        return self.render(form)
    # Check if form was refreshed
    management_form = ManagementForm(self.request.POST, prefix=self.prefix)
    if not management_form.is_valid():
        raise ValidationError(
            'ManagementForm data is missing or has been tampered.')
    form_current_step = management_form.cleaned_data['current_step']
    if (form_current_step != self.steps.current and
            self.storage.current_step is not None):
        # form refreshed, change current step
        self.storage.current_step = form_current_step
    # get the form for the current step
    form = self.get_form(data=self.request.POST, files=self.request.FILES)
    # and try to validate
    if form.is_valid():
        # if the form is valid, store the cleaned data and files.
        self.storage.set_step_data(self.steps.current, self.process_step(form))
        self.storage.set_step_files(self.steps.current, self.process_step_files(form))
        # check if the current step is the last step
        if self.steps.current == self.steps.last:
            # no more steps, render done view
            return self.render_done(form, **kwargs)
        else:
            # proceed to the next step
            return self.render_next_step(form)
    return self.render(form)

def process_step(self, form): WizardView

This method is used to postprocess the form data. By default, it
returns the raw `form.data` dictionary.
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def process_step(self, form):
    """
    This method is used to postprocess the form data. By default, it
    returns the raw `form.data` dictionary.
    """
    return self.get_form_step_data(form)

def process_step_files(self, form): WizardView

This method is used to postprocess the form files. By default, it
returns the raw `form.files` dictionary.
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def process_step_files(self, form):
    """
    This method is used to postprocess the form files. By default, it
    returns the raw `form.files` dictionary.
    """
    return self.get_form_step_files(form)

def render(self, form=None, **kwargs): WizardView

Returns a ``HttpResponse`` containing all needed context data.
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def render(self, form=None, **kwargs):
    """
    Returns a ``HttpResponse`` containing all needed context data.
    """
    form = form or self.get_form()
    context = self.get_context_data(form=form, **kwargs)
    return self.render_to_response(context)

def render_done(self, form, **kwargs): WizardView

This method gets called when all forms passed. The method should also
re-validate all steps to prevent manipulation. If any form don't
validate, `render_revalidation_failure` should get called.
If everything is fine call `done`.
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def render_done(self, form, **kwargs):
    """
    This method gets called when all forms passed. The method should also
    re-validate all steps to prevent manipulation. If any form don't
    validate, `render_revalidation_failure` should get called.
    If everything is fine call `done`.
    """
    final_form_list = []
    # walk through the form list and try to validate the data again.
    for form_key in self.get_form_list():
        form_obj = self.get_form(step=form_key,
            data=self.storage.get_step_data(form_key),
            files=self.storage.get_step_files(form_key))
        if not form_obj.is_valid():
            return self.render_revalidation_failure(form_key, form_obj, **kwargs)
        final_form_list.append(form_obj)
    # render the done view and reset the wizard before returning the
    # response. This is needed to prevent from rendering done with the
    # same data twice.
    done_response = self.done(final_form_list, **kwargs)
    self.storage.reset()
    return done_response

def render_next_step(self, form, **kwargs): WizardView

This method gets called when the next step/form should be rendered.
`form` contains the last/current form.
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def render_next_step(self, form, **kwargs):
    """
    This method gets called when the next step/form should be rendered.
    `form` contains the last/current form.
    """
    # get the form instance based on the data from the storage backend
    # (if available).
    next_step = self.steps.next
    new_form = self.get_form(next_step,
        data=self.storage.get_step_data(next_step),
        files=self.storage.get_step_files(next_step))
    # change the stored current step
    self.storage.current_step = next_step
    return self.render(new_form, **kwargs)

def render_revalidation_failure(self, step, form, **kwargs): WizardView

Gets called when a form doesn't validate when rendering the done
view. By default, it changes the current step to failing forms step
and renders the form.
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def render_revalidation_failure(self, step, form, **kwargs):
    """
    Gets called when a form doesn't validate when rendering the done
    view. By default, it changes the current step to failing forms step
    and renders the form.
    """
    self.storage.current_step = step
    return self.render(form, **kwargs)

def render_to_response(self, context, **response_kwargs): TemplateResponseMixin

Returns a response with a template rendered with the given context.
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def render_to_response(self, context, **response_kwargs):
    """
    Returns a response with a template rendered with the given context.
    """
    return self.response_class(
        request = self.request,
        template = self.get_template_names(),
        context = context,
        **response_kwargs
    )

def __repr__(self): WizardView

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def __repr__(self):
    return '<%s: forms: %s>' % (self.__class__.__name__, self.form_list)