1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import scoped_session, sessionmaker, object_session
from sqlalchemy.orm.query import Query
from sqlalchemy.sql.expression import desc
from mediagoblin.db.sql.fake import DESCENDING
def _get_query_model(query):
cols = query.column_descriptions
assert len(cols) == 1, "These functions work only on simple queries"
return cols[0]["type"]
class GMGQuery(Query):
def sort(self, key, direction):
key_col = getattr(_get_query_model(self), key)
if direction is DESCENDING:
key_col = desc(key_col)
return self.order_by(key_col)
def skip(self, amount):
return self.offset(amount)
Session = scoped_session(sessionmaker(query_cls=GMGQuery))
def _fix_query_dict(query_dict):
if '_id' in query_dict:
query_dict['id'] = query_dict.pop('_id')
class GMGTableBase(object):
query = Session.query_property()
@classmethod
def find(cls, query_dict=None):
if query_dict is None:
query_dict = {}
_fix_query_dict(query_dict)
return cls.query.filter_by(**query_dict)
@classmethod
def find_one(cls, query_dict=None):
if query_dict is None:
query_dict = {}
_fix_query_dict(query_dict)
return cls.query.filter_by(**query_dict).first()
@classmethod
def one(cls, query_dict):
return cls.find(query_dict).one()
def get(self, key):
return getattr(self, key)
def setdefault(self, key, defaultvalue):
# The key *has* to exist on sql.
return getattr(self, key)
def save(self, validate=True):
assert validate
sess = object_session(self)
if sess is None:
sess = Session()
sess.add(self)
sess.commit()
def delete(self, commit=True):
"""Delete the object and commit the change immediately by default"""
sess = object_session(self)
assert sess is not None, "Not going to delete detached %r" % self
sess.delete(self)
if commit:
sess.commit()
Base = declarative_base(cls=GMGTableBase)
class DictReadAttrProxy(object):
"""
Maps read accesses to obj['key'] to obj.key
and hides all the rest of the obj
"""
def __init__(self, proxied_obj):
self.proxied_obj = proxied_obj
def __getitem__(self, key):
try:
return getattr(self.proxied_obj, key)
except AttributeError:
raise KeyError("%r is not an attribute on %r"
% (key, self.proxied_obj))
|
