def create_view(self, cls, add_filters, name, label, dimension,
breakdown=None, view_filters={}):
'''\
Create a view. The view will be computed when you call
:meth:`finalize`.
``cls``
A model class (inheriting from :class:`openspending.model.Base`)
``add_filters``
A :term:`mongodb query spec` used as a query to select the
instances of *cls* that will be used for the view.
``name``
A name for the view. This name must be unique for all views
for *cls* in an Open Spending site.
``label``
A label that can be displayed to the user.
``dimensions``
The dimensions that will be used to compute the view
``breakdown``
...
``view_filters``
...
Returns: A :class:`openspending.lib.views.View` object.
'''
log.debug("pre-aggregating view %s on %r where %r",
name, cls, view_filters)
view = View(self.dataset, name, label, dimension,
breakdown, cuts=view_filters)
view.apply_to(cls, add_filters)
view.compute()
Dataset.c.update({'name': self.dataset.name},
{'$set': {'cubes': self.dataset.get('cubes', {})}})
self.dataset = Dataset.by_id(self.dataset.name)
return view
