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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
from sqlalchemy import testing
from sqlalchemy import Integer, String, ForeignKey, func, select
from sqlalchemy.testing.schema import Table, Column
from sqlalchemy.orm import mapper, relationship, create_session
from sqlalchemy.testing import fixtures
from sqlalchemy.testing import eq_
class AssociationTest(fixtures.MappedTest):
run_setup_classes = 'once'
run_setup_mappers = 'once'
@classmethod
def define_tables(cls, metadata):
Table('items', metadata,
Column('item_id', Integer, primary_key=True,
test_needs_autoincrement=True),
Column('name', String(40)))
Table('item_keywords', metadata,
Column('item_id', Integer, ForeignKey('items.item_id')),
Column('keyword_id', Integer, ForeignKey('keywords.keyword_id')),
Column('data', String(40)))
Table('keywords', metadata,
Column('keyword_id', Integer, primary_key=True,
test_needs_autoincrement=True),
Column('name', String(40)))
@classmethod
def setup_classes(cls):
class Item(cls.Basic):
def __init__(self, name):
self.name = name
def __repr__(self):
return "Item id=%d name=%s keywordassoc=%r" % (
self.item_id, self.name, self.keywords)
class Keyword(cls.Basic):
def __init__(self, name):
self.name = name
def __repr__(self):
return "Keyword id=%d name=%s" % (self.keyword_id, self.name)
class KeywordAssociation(cls.Basic):
def __init__(self, keyword, data):
self.keyword = keyword
self.data = data
def __repr__(self):
return "KeywordAssociation itemid=%d keyword=%r data=%s" % (
self.item_id, self.keyword, self.data)
@classmethod
def setup_mappers(cls):
KeywordAssociation, Item, Keyword = (cls.classes.KeywordAssociation,
cls.classes.Item,
cls.classes.Keyword)
items, item_keywords, keywords = cls.tables.get_all(
'items', 'item_keywords', 'keywords')
mapper(Keyword, keywords)
mapper(KeywordAssociation, item_keywords, properties={
'keyword': relationship(Keyword, lazy='joined')},
primary_key=[item_keywords.c.item_id, item_keywords.c.keyword_id])
mapper(Item, items, properties={
'keywords': relationship(KeywordAssociation,
order_by=item_keywords.c.data,
cascade="all, delete-orphan")
})
def test_insert(self):
KeywordAssociation, Item, Keyword = (self.classes.KeywordAssociation,
self.classes.Item,
self.classes.Keyword)
sess = create_session()
item1 = Item('item1')
item2 = Item('item2')
item1.keywords.append(KeywordAssociation(
Keyword('blue'), 'blue_assoc'))
item1.keywords.append(KeywordAssociation(Keyword('red'), 'red_assoc'))
item2.keywords.append(KeywordAssociation(
Keyword('green'), 'green_assoc'))
sess.add_all((item1, item2))
sess.flush()
saved = repr([item1, item2])
sess.expunge_all()
result = sess.query(Item).all()
loaded = repr(result)
eq_(saved, loaded)
def test_replace(self):
KeywordAssociation, Item, Keyword = (self.classes.KeywordAssociation,
self.classes.Item,
self.classes.Keyword)
sess = create_session()
item1 = Item('item1')
item1.keywords.append(KeywordAssociation(
Keyword('blue'), 'blue_assoc'))
item1.keywords.append(KeywordAssociation(Keyword('red'), 'red_assoc'))
sess.add(item1)
sess.flush()
red_keyword = item1.keywords[1].keyword
del item1.keywords[1]
item1.keywords.append(KeywordAssociation(red_keyword, 'new_red_assoc'))
sess.flush()
saved = repr([item1])
sess.expunge_all()
result = sess.query(Item).all()
loaded = repr(result)
eq_(saved, loaded)
def test_modify(self):
KeywordAssociation, Item, Keyword = (self.classes.KeywordAssociation,
self.classes.Item,
self.classes.Keyword)
sess = create_session()
item1 = Item('item1')
item2 = Item('item2')
item1.keywords.append(KeywordAssociation(
Keyword('blue'), 'blue_assoc'))
item1.keywords.append(KeywordAssociation(Keyword('red'), 'red_assoc'))
item2.keywords.append(KeywordAssociation(
Keyword('green'), 'green_assoc'))
sess.add_all((item1, item2))
sess.flush()
red_keyword = item1.keywords[1].keyword
del item1.keywords[0]
del item1.keywords[0]
purple_keyword = Keyword('purple')
item1.keywords.append(KeywordAssociation(red_keyword, 'new_red_assoc'))
item2.keywords.append(KeywordAssociation(
purple_keyword, 'purple_item2_assoc'))
item1.keywords.append(KeywordAssociation(
purple_keyword, 'purple_item1_assoc'))
item1.keywords.append(KeywordAssociation(
Keyword('yellow'), 'yellow_assoc'))
sess.flush()
saved = repr([item1, item2])
sess.expunge_all()
result = sess.query(Item).all()
loaded = repr(result)
eq_(saved, loaded)
def test_delete(self):
KeywordAssociation = self.classes.KeywordAssociation
Item = self.classes.Item
item_keywords = self.tables.item_keywords
Keyword = self.classes.Keyword
sess = create_session()
item1 = Item('item1')
item2 = Item('item2')
item1.keywords.append(KeywordAssociation(
Keyword('blue'), 'blue_assoc'))
item1.keywords.append(KeywordAssociation(Keyword('red'), 'red_assoc'))
item2.keywords.append(KeywordAssociation(
Keyword('green'), 'green_assoc'))
sess.add_all((item1, item2))
sess.flush()
eq_(select([func.count('*')]).select_from(item_keywords).scalar(), 3)
sess.delete(item1)
sess.delete(item2)
sess.flush()
eq_(select([func.count('*')]).select_from(item_keywords).scalar(), 0)
|
