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managers.py
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53 lines (46 loc) · 1.95 KB
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# ------------------------------------------------------------------------
class ActiveAwareContentManagerMixin:
"""
Implement what's necessary to add some kind of "active" state for content
objects. The notion of active is defined by a number of filter rules that
must all match (AND) for the object to be active.
A Manager for a content class using the "datepublisher" extension
should either adopt this mixin or implement a similar interface.
"""
# A dict of filters which are used to determine whether a page is active or
# not. Extended for example in the datepublisher extension (date-based
# publishing and un-publishing of pages). This will be set in
# add_to_active_filters() below, so we won't share the same dict for
# derived managers, do not replace with {} here!
active_filters = None
@classmethod
def apply_active_filters(cls, queryset):
"""
Apply all filters defined to the queryset passed and return the result.
"""
if cls.active_filters is not None:
for filt in cls.active_filters.values() or ():
if callable(filt):
queryset = filt(queryset)
else:
queryset = queryset.filter(filt)
return queryset
@classmethod
def add_to_active_filters(cls, filter, key=None):
"""
Add a new clause to the active filters. A filter may be either
a Q object to be applied to the content class or a callable taking
a queryset and spitting out a new one.
If a filter with the given `key` already exists, the new filter
replaces the old.
"""
if cls.active_filters is None:
cls.active_filters = {}
if key is None:
key = filter
cls.active_filters[key] = filter
def active(self):
"""
Return only currently active objects.
"""
return self.apply_active_filters(self)