Add sidebar menu items for /site/docs/list and /site/docs/edit. They do not
currently have view functions attached, but there are other links in the
mock-up portion of the sidebar that don't currently work, either. The goal
is to commit the /site/docs/list and /site/docs/edit changes in small bits
that don't break anyone else.
"""
Various data structures used in query construction.
Factored out from django.db.models.query so that they can also be used by other
modules without getting into circular import difficulties.
"""
from copy import deepcopy
from django.utils import tree
class QueryWrapper(object):
"""
A type that indicates the contents are an SQL fragment and the associate
parameters. Can be used to pass opaque data to a where-clause, for example.
"""
def __init__(self, sql, params):
self.data = sql, params
class Q(tree.Node):
"""
Encapsulates filters as objects that can then be combined logically (using
& and |).
"""
# Connection types
AND = 'AND'
OR = 'OR'
default = AND
def __init__(self, *args, **kwargs):
super(Q, self).__init__(children=list(args) + kwargs.items())
def _combine(self, other, conn):
if not isinstance(other, Q):
raise TypeError(other)
obj = deepcopy(self)
obj.add(other, conn)
return obj
def __or__(self, other):
return self._combine(other, self.OR)
def __and__(self, other):
return self._combine(other, self.AND)
def __invert__(self):
obj = deepcopy(self)
obj.negate()
return obj