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from funcy import cached_property
from django.core.exceptions import ImproperlyConfigured
from .conf import settings
def get_prefix(**kwargs):
return settings.CACHEOPS_PREFIX(PrefixQuery(**kwargs))
class PrefixQuery(object):
def __init__(self, **kwargs):
assert set(kwargs) <= {'func', '_queryset', '_cond_dnfs', 'dbs', 'tables'}
kwargs.setdefault('func', None)
self.__dict__.update(kwargs)
@cached_property
def dbs(self):
return [self._queryset.db]
@cached_property
def db(self):
if len(self.dbs) > 1:
dbs_str = ', '.join(self.dbs)
raise ImproperlyConfigured('Single db required, but several used: ' + dbs_str)
return self.dbs[0]
# TODO: think if I should expose it and how. Same for queryset.
@cached_property
def _cond_dnfs(self):
return self._queryset._cond_dnfs
@cached_property
def tables(self):
return list(self._cond_dnfs)
@cached_property
def table(self):
if len(self.tables) > 1:
tables_str = ', '.join(self.tables)
raise ImproperlyConfigured('Single table required, but several used: ' + tables_str)
return self.tables[0]
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