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from sqlalchemy import mapper, util, Query, exceptions
import types
def monkeypatch_query_method(ctx, class_, name):
def do(self, *args, **kwargs):
query = Query(class_, session=ctx.current)
return getattr(query, name)(*args, **kwargs)
try:
do.__name__ = name
except:
pass
setattr(class_, name, classmethod(do))
def monkeypatch_objectstore_method(ctx, class_, name):
def do(self, *args, **kwargs):
session = ctx.current
if name == "flush":
# flush expects a list of objects
self = [self]
return getattr(session, name)(self, *args, **kwargs)
try:
do.__name__ = name
except:
pass
setattr(class_, name, do)
def assign_mapper(ctx, class_, *args, **kwargs):
validate = kwargs.pop('validate', False)
if not isinstance(getattr(class_, '__init__'), types.MethodType):
def __init__(self, **kwargs):
for key, value in kwargs.items():
if validate:
if not key in self.mapper.props:
raise exceptions.ArgumentError("Invalid __init__ argument: '%s'" % key)
setattr(self, key, value)
class_.__init__ = __init__
extension = kwargs.pop('extension', None)
if extension is not None:
extension = util.to_list(extension)
extension.append(ctx.mapper_extension)
else:
extension = ctx.mapper_extension
m = mapper(class_, extension=extension, *args, **kwargs)
class_.mapper = m
class_.query = classmethod(lambda cls: Query(class_, session=ctx.current))
for name in ['get', 'filter', 'filter_by', 'select', 'select_by', 'selectfirst', 'selectfirst_by', 'selectone', 'selectone_by', 'get_by', 'join_to', 'join_via', 'count', 'count_by', 'options', 'instances']:
monkeypatch_query_method(ctx, class_, name)
for name in ['flush', 'delete', 'expire', 'refresh', 'expunge', 'merge', 'save', 'update', 'save_or_update']:
monkeypatch_objectstore_method(ctx, class_, name)
return m
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