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 six.iteritems(kwargs):
        setattr(self, key, value)

@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("You tried to pass in the %s method name as a "
                            "keyword argument to %s(). Don't do that."
                            % (key, cls.__name__))
        if not hasattr(cls, key):
            raise TypeError("%s() received an invalid keyword %r. as_view "
                            "only accepts arguments that are already "
                            "attributes of the class." % (cls.__name__, key))
    def view(request, *args, **kwargs):
        self = cls(**initkwargs)
        if hasattr(self, 'get') and not hasattr(self, 'head'):
            self.head = self.get
        self.request = request
        self.args = args
        self.kwargs = kwargs
        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 construct_inlines(self):
    """
    Returns the inline formset instances
    """
    inline_formsets = []
    for inline_class in self.get_inlines():
        inline_instance = inline_class(self.model, self.request, self.object, self.kwargs, self)
        inline_formset = inline_instance.construct_formset()
        inline_formsets.append(inline_formset)
    return inline_formsets

def _wrapper(self, *args, **kwargs):
    @decorator
    def bound_func(*args2, **kwargs2):
        return func(self, *args2, **kwargs2)
    # bound_func has the signature that 'decorator' expects i.e.  no
    # 'self' argument, but it is a closure over self so it can call
    # 'func' correctly.
    return bound_func(*args, **kwargs)

def form_invalid(self, form):
    """
    If the form is invalid, re-render the context data with the
    data-filled form and errors.
    """
    return self.render_to_response(self.get_context_data(form=form))

def form_valid(self, form):
    """
    If the form is valid, save the associated model.
    """
    self.object = form.save()
    return super(ModelFormMixin, self).form_valid(form)

def forms_invalid(self, form, inlines):
    """
    If the form or formsets are invalid, re-render the context data with the
    data-filled form and formsets and errors.
    """
    return self.render_to_response(self.get_context_data(form=form, inlines=inlines))

def forms_valid(self, form, inlines):
    messages.info(self.request, ugettext_lazy("You have successfully added your collection."))
    obj = form.save()
    obj.set_revision(self.request.user)
    return super(CollectionAddView, self).forms_valid(form, inlines)

def get(self, request, *args, **kwargs):
    self.object = None
    return super(BaseCreateWithInlinesView, self).get(request, *args, **kwargs)

def get_context_data(self, **kwargs):
    """
    Insert the single object into the context dict.
    """
    context = {}
    if self.object:
        context['object'] = self.object
        context_object_name = self.get_context_object_name(self.object)
        if context_object_name:
            context[context_object_name] = self.object
    context.update(kwargs)
    return super(SingleObjectMixin, self).get_context_data(**context)

def get_context_object_name(self, obj):
    """
    Get the name to use for the object.
    """
    if self.context_object_name:
        return self.context_object_name
    elif isinstance(obj, models.Model):
        return obj._meta.model_name
    else:
        return None

def get_form(self, form_class):
    """
    Returns an instance of the form to be used in this view.
    """
    return form_class(**self.get_form_kwargs())

def get_form_class(self):
    """
    Returns the form class to use in this view.
    """
    if self.form_class:
        return self.form_class
    else:
        if self.model is not None:
            # If a model has been explicitly provided, use it
            model = self.model
        elif hasattr(self, 'object') and self.object is not None:
            # If this view is operating on a single object, use
            # the class of that object
            model = self.object.__class__
        else:
            # Try to get a queryset and extract the model class
            # from that
            model = self.get_queryset().model
        if self.fields is None:
            warnings.warn("Using ModelFormMixin (base class of %s) without "
                          "the 'fields' attribute is deprecated." % self.__class__.__name__,
                          PendingDeprecationWarning)
        return model_forms.modelform_factory(model, fields=self.fields)

def get_form_kwargs(self):
    """
    Returns the keyword arguments for instantiating the form.
    """
    kwargs = super(ModelFormMixin, self).get_form_kwargs()
    kwargs.update({'instance': self.object})
    return kwargs

def get_initial(self):
    """
    Returns the initial data to use for forms on this view.
    """
    return self.initial.copy()

def get_inlines(self):
    """
    Returns the inline formset classes
    """
    return self.inlines

def get_object(self):
    obj = self.model.objects.filter(code=self.kwargs['public_id'])
    if not obj:
        if self.kwargs['public_id'].isdigit():
            try:
                obj = self.model.objects.get(id=self.kwargs['public_id'])
            except self.model.DoesNotExist:
                raise Http404
        else:
            raise Http404
    else:
        obj = obj[0]
    return obj

def get_prefix(self):
    """
    Returns the prefix to use for forms on this view
    """
    return self.prefix

def get_queryset(self):
    """
    Get the queryset to look an object up against. May not be called if
    `get_object` is overridden.
    """
    if self.queryset is None:
        if self.model:
            return self.model._default_manager.all()
        else:
            raise ImproperlyConfigured("%(cls)s is missing a queryset. Define "
                                       "%(cls)s.model, %(cls)s.queryset, or override "
                                       "%(cls)s.get_queryset()." % {
                                            'cls': self.__class__.__name__
                                    })
    return self.queryset._clone()

def get_slug_field(self):
    """
    Get the name of a slug field to be used to look up by slug.
    """
    return self.slug_field

def get_success_url(self):
    return reverse_lazy('telemeta-collection-detail', kwargs={'public_id': self.object.code})

def get_template_names(self):
    """
    Return a list of template names to be used for the request. May not be
    called if render_to_response is overridden. Returns the following list:
    * the value of ``template_name`` on the view (if provided)
    * the contents of the ``template_name_field`` field on the
      object instance that the view is operating upon (if available)
    * ``<app_label>/<model_name><template_name_suffix>.html``
    """
    try:
        names = super(SingleObjectTemplateResponseMixin, self).get_template_names()
    except ImproperlyConfigured:
        # If template_name isn't specified, it's not a problem --
        # we just start with an empty list.
        names = []
        # If self.template_name_field is set, grab the value of the field
        # of that name from the object; this is the most specific template
        # name, if given.
        if self.object and self.template_name_field:
            name = getattr(self.object, self.template_name_field, None)
            if name:
                names.insert(0, name)
        # The least-specific option is the default <app>/<model>_detail.html;
        # only use this if the object in question is a model.
        if isinstance(self.object, models.Model):
            names.append("%s/%s%s.html" % (
                self.object._meta.app_label,
                self.object._meta.model_name,
                self.template_name_suffix
            ))
        elif hasattr(self, 'model') and self.model is not None and issubclass(self.model, models.Model):
            names.append("%s/%s%s.html" % (
                self.model._meta.app_label,
                self.model._meta.model_name,
                self.template_name_suffix
            ))
        # If we still haven't managed to find any template names, we should
        # re-raise the ImproperlyConfigured to alert the user.
        if not names:
            raise
    return names

def http_method_not_allowed(self, request, *args, **kwargs):
    logger.warning('Method Not Allowed (%s): %s', request.method, request.path,
        extra={
            'status_code': 405,
            'request': self.request
        }
    )
    return http.HttpResponseNotAllowed(self._allowed_methods())

def options(self, request, *args, **kwargs):
    """
    Handles responding to requests for the OPTIONS HTTP verb.
    """
    response = http.HttpResponse()
    response['Allow'] = ', '.join(self._allowed_methods())
    response['Content-Length'] = '0'
    return response

def post(self, request, *args, **kwargs):
    self.object = None
    return super(BaseCreateWithInlinesView, self).post(request, *args, **kwargs)

def put(self, *args, **kwargs):
    return self.post(*args, **kwargs)

def render_to_response(self, context, **response_kwargs):
    """
    Returns a response, using the `response_class` for this
    view, with a template rendered with the given context.
    If any keyword arguments are provided, they will be
    passed to the constructor of the response class.
    """
    response_kwargs.setdefault('content_type', self.content_type)
    return self.response_class(
        request = self.request,
        template = self.get_template_names(),
        context = context,
        **response_kwargs
    )

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 six.iteritems(kwargs):
        setattr(self, key, value)

@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("You tried to pass in the %s method name as a "
                            "keyword argument to %s(). Don't do that."
                            % (key, cls.__name__))
        if not hasattr(cls, key):
            raise TypeError("%s() received an invalid keyword %r. as_view "
                            "only accepts arguments that are already "
                            "attributes of the class." % (cls.__name__, key))
    def view(request, *args, **kwargs):
        self = cls(**initkwargs)
        if hasattr(self, 'get') and not hasattr(self, 'head'):
            self.head = self.get
        self.request = request
        self.args = args
        self.kwargs = kwargs
        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 construct_inlines(self):
    """
    Returns the inline formset instances
    """
    inline_formsets = []
    for inline_class in self.get_inlines():
        inline_instance = inline_class(self.model, self.request, self.object, self.kwargs, self)
        inline_formset = inline_instance.construct_formset()
        inline_formsets.append(inline_formset)
    return inline_formsets

def _wrapper(self, *args, **kwargs):
    @decorator
    def bound_func(*args2, **kwargs2):
        return func(self, *args2, **kwargs2)
    # bound_func has the signature that 'decorator' expects i.e.  no
    # 'self' argument, but it is a closure over self so it can call
    # 'func' correctly.
    return bound_func(*args, **kwargs)

def form_invalid(self, form):
    """
    If the form is invalid, re-render the context data with the
    data-filled form and errors.
    """
    return self.render_to_response(self.get_context_data(form=form))

def form_valid(self, form):
    """
    If the form is valid, save the associated model.
    """
    self.object = form.save()
    return super(ModelFormMixin, self).form_valid(form)

def forms_invalid(self, form, inlines):
    """
    If the form or formsets are invalid, re-render the context data with the
    data-filled form and formsets and errors.
    """
    return self.render_to_response(self.get_context_data(form=form, inlines=inlines))

def forms_valid(self, form, inlines):
    messages.info(self.request, ugettext_lazy("You have successfully added your collection."))
    obj = form.save()
    obj.set_revision(self.request.user)
    return super(CollectionAddView, self).forms_valid(form, inlines)

def get(self, request, *args, **kwargs):
    self.object = None
    return super(BaseCreateWithInlinesView, self).get(request, *args, **kwargs)

def get_context_data(self, **kwargs):
    context = super(CollectionCopyView, self).get_context_data(**kwargs)
    collection = self.get_object()
    context['collection'] = collection
    return context

def get_context_object_name(self, obj):
    """
    Get the name to use for the object.
    """
    if self.context_object_name:
        return self.context_object_name
    elif isinstance(obj, models.Model):
        return obj._meta.model_name
    else:
        return None

def get_form(self, form_class):
    """
    Returns an instance of the form to be used in this view.
    """
    return form_class(**self.get_form_kwargs())

def get_form_class(self):
    """
    Returns the form class to use in this view.
    """
    if self.form_class:
        return self.form_class
    else:
        if self.model is not None:
            # If a model has been explicitly provided, use it
            model = self.model
        elif hasattr(self, 'object') and self.object is not None:
            # If this view is operating on a single object, use
            # the class of that object
            model = self.object.__class__
        else:
            # Try to get a queryset and extract the model class
            # from that
            model = self.get_queryset().model
        if self.fields is None:
            warnings.warn("Using ModelFormMixin (base class of %s) without "
                          "the 'fields' attribute is deprecated." % self.__class__.__name__,
                          PendingDeprecationWarning)
        return model_forms.modelform_factory(model, fields=self.fields)

def get_form_kwargs(self):
    """
    Returns the keyword arguments for instantiating the form.
    """
    kwargs = super(ModelFormMixin, self).get_form_kwargs()
    kwargs.update({'instance': self.object})
    return kwargs

def get_initial(self):
    return model_to_dict(self.get_object())

def get_inlines(self):
    """
    Returns the inline formset classes
    """
    return self.inlines

def get_object(self):
    obj = self.model.objects.filter(code=self.kwargs['public_id'])
    if not obj:
        if self.kwargs['public_id'].isdigit():
            try:
                obj = self.model.objects.get(id=self.kwargs['public_id'])
            except self.model.DoesNotExist:
                raise Http404
        else:
            raise Http404
    else:
        obj = obj[0]
    return obj

def get_prefix(self):
    """
    Returns the prefix to use for forms on this view
    """
    return self.prefix

def get_queryset(self):
    """
    Get the queryset to look an object up against. May not be called if
    `get_object` is overridden.
    """
    if self.queryset is None:
        if self.model:
            return self.model._default_manager.all()
        else:
            raise ImproperlyConfigured("%(cls)s is missing a queryset. Define "
                                       "%(cls)s.model, %(cls)s.queryset, or override "
                                       "%(cls)s.get_queryset()." % {
                                            'cls': self.__class__.__name__
                                    })
    return self.queryset._clone()

def get_slug_field(self):
    """
    Get the name of a slug field to be used to look up by slug.
    """
    return self.slug_field

def get_success_url(self):
    return reverse_lazy('telemeta-collection-detail', kwargs={'public_id': self.object.code})

def get_template_names(self):
    """
    Return a list of template names to be used for the request. May not be
    called if render_to_response is overridden. Returns the following list:
    * the value of ``template_name`` on the view (if provided)
    * the contents of the ``template_name_field`` field on the
      object instance that the view is operating upon (if available)
    * ``<app_label>/<model_name><template_name_suffix>.html``
    """
    try:
        names = super(SingleObjectTemplateResponseMixin, self).get_template_names()
    except ImproperlyConfigured:
        # If template_name isn't specified, it's not a problem --
        # we just start with an empty list.
        names = []
        # If self.template_name_field is set, grab the value of the field
        # of that name from the object; this is the most specific template
        # name, if given.
        if self.object and self.template_name_field:
            name = getattr(self.object, self.template_name_field, None)
            if name:
                names.insert(0, name)
        # The least-specific option is the default <app>/<model>_detail.html;
        # only use this if the object in question is a model.
        if isinstance(self.object, models.Model):
            names.append("%s/%s%s.html" % (
                self.object._meta.app_label,
                self.object._meta.model_name,
                self.template_name_suffix
            ))
        elif hasattr(self, 'model') and self.model is not None and issubclass(self.model, models.Model):
            names.append("%s/%s%s.html" % (
                self.model._meta.app_label,
                self.model._meta.model_name,
                self.template_name_suffix
            ))
        # If we still haven't managed to find any template names, we should
        # re-raise the ImproperlyConfigured to alert the user.
        if not names:
            raise
    return names

def http_method_not_allowed(self, request, *args, **kwargs):
    logger.warning('Method Not Allowed (%s): %s', request.method, request.path,
        extra={
            'status_code': 405,
            'request': self.request
        }
    )
    return http.HttpResponseNotAllowed(self._allowed_methods())

def options(self, request, *args, **kwargs):
    """
    Handles responding to requests for the OPTIONS HTTP verb.
    """
    response = http.HttpResponse()
    response['Allow'] = ', '.join(self._allowed_methods())
    response['Content-Length'] = '0'
    return response

def post(self, request, *args, **kwargs):
    self.object = None
    return super(BaseCreateWithInlinesView, self).post(request, *args, **kwargs)

def put(self, *args, **kwargs):
    return self.post(*args, **kwargs)

def render_to_response(self, context, **response_kwargs):
    """
    Returns a response, using the `response_class` for this
    view, with a template rendered with the given context.
    If any keyword arguments are provided, they will be
    passed to the constructor of the response class.
    """
    response_kwargs.setdefault('content_type', self.content_type)
    return self.response_class(
        request = self.request,
        template = self.get_template_names(),
        context = context,
        **response_kwargs
    )

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 six.iteritems(kwargs):
        setattr(self, key, value)

@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("You tried to pass in the %s method name as a "
                            "keyword argument to %s(). Don't do that."
                            % (key, cls.__name__))
        if not hasattr(cls, key):
            raise TypeError("%s() received an invalid keyword %r. as_view "
                            "only accepts arguments that are already "
                            "attributes of the class." % (cls.__name__, key))
    def view(request, *args, **kwargs):
        self = cls(**initkwargs)
        if hasattr(self, 'get') and not hasattr(self, 'head'):
            self.head = self.get
        self.request = request
        self.args = args
        self.kwargs = kwargs
        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):
    # 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
    return handler(request, *args, **kwargs)

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

def get_context_data(self, **kwargs):
    context = super(CollectionDetailView, self).get_context_data(**kwargs)
    collection = self.get_object()
    items = collection.items.enriched()
    context['collection'] = collection
    context['items'] = items.order_by('code', 'old_code')
    context['playlists'] = get_playlists_names(self.request)
    context['related_media'] = MediaCollectionRelated.objects.filter(collection=collection)
    check_related_media(context['related_media'])
    context['parents'] = MediaCorpus.objects.filter(children=collection)
    revisions = Revision.objects.filter(element_type='collection',
                                        element_id=collection.id)
    if revisions:
        context['last_revision'] = revisions[0]
    else:
        context['last_revision'] = None
    return context

def get_context_object_name(self, obj):
    """
    Get the name to use for the object.
    """
    if self.context_object_name:
        return self.context_object_name
    elif isinstance(obj, models.Model):
        return obj._meta.model_name
    else:
        return None

def get_object(self):
    obj = self.model.objects.filter(code=self.kwargs['public_id'])
    if not obj:
        if self.kwargs['public_id'].isdigit():
            try:
                obj = self.model.objects.get(id=self.kwargs['public_id'])
            except self.model.DoesNotExist:
                raise Http404
        else:
            raise Http404
    else:
        obj = obj[0]
    return obj

def get_queryset(self):
    """
    Get the queryset to look an object up against. May not be called if
    `get_object` is overridden.
    """
    if self.queryset is None:
        if self.model:
            return self.model._default_manager.all()
        else:
            raise ImproperlyConfigured("%(cls)s is missing a queryset. Define "
                                       "%(cls)s.model, %(cls)s.queryset, or override "
                                       "%(cls)s.get_queryset()." % {
                                            'cls': self.__class__.__name__
                                    })
    return self.queryset._clone()