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
|
# Additional MySQL-specific tests
# Written by: F. Gabriel Gosselin <gabrielNOSPAM@evidens.ca>
# Based on tests by: aarranz
from south.tests import unittest, skipUnless
from south.db import db, generic, mysql
from django.db import connection, models
from south.utils.py3 import with_metaclass
# A class decoration may be used in lieu of this when Python 2.5 is the
# minimum.
class TestMySQLOperationsMeta(type):
def __new__(mcs, name, bases, dict_):
decorator = skipUnless(db.backend_name == "mysql", 'MySQL-specific tests')
for key, method in dict_.items():
if key.startswith('test'):
dict_[key] = decorator(method)
return type.__new__(mcs, name, bases, dict_)
class TestMySQLOperations(with_metaclass(TestMySQLOperationsMeta, unittest.TestCase)):
"""MySQL-specific tests"""
def setUp(self):
db.debug = False
db.clear_deferred_sql()
def tearDown(self):
pass
def _create_foreign_tables(self, main_name, reference_name):
# Create foreign table and model
Foreign = db.mock_model(model_name='Foreign', db_table=reference_name,
db_tablespace='', pk_field_name='id',
pk_field_type=models.AutoField,
pk_field_args=[])
db.create_table(reference_name, [
('id', models.AutoField(primary_key=True)),
])
# Create table with foreign key
db.create_table(main_name, [
('id', models.AutoField(primary_key=True)),
('foreign', models.ForeignKey(Foreign)),
])
return Foreign
def test_constraint_references(self):
"""Tests that referred table is reported accurately"""
main_table = 'test_cns_ref'
reference_table = 'test_cr_foreign'
db.start_transaction()
self._create_foreign_tables(main_table, reference_table)
db.execute_deferred_sql()
constraint = db._find_foreign_constraints(main_table, 'foreign_id')[0]
references = db._lookup_constraint_references(main_table, constraint)
self.assertEquals((reference_table, 'id'), references)
db.delete_table(main_table)
db.delete_table(reference_table)
def test_reverse_column_constraint(self):
"""Tests that referred column in a foreign key (ex. id) is found"""
main_table = 'test_reverse_ref'
reference_table = 'test_rr_foreign'
db.start_transaction()
self._create_foreign_tables(main_table, reference_table)
db.execute_deferred_sql()
inverse = db._lookup_reverse_constraint(reference_table, 'id')
(cname, rev_table, rev_column) = inverse[0]
self.assertEquals(main_table, rev_table)
self.assertEquals('foreign_id', rev_column)
db.delete_table(main_table)
db.delete_table(reference_table)
def test_delete_fk_column(self):
main_table = 'test_drop_foreign'
ref_table = 'test_df_ref'
self._create_foreign_tables(main_table, ref_table)
db.execute_deferred_sql()
constraints = db._find_foreign_constraints(main_table, 'foreign_id')
self.assertEquals(len(constraints), 1)
db.delete_column(main_table, 'foreign_id')
constraints = db._find_foreign_constraints(main_table, 'foreign_id')
self.assertEquals(len(constraints), 0)
db.delete_table(main_table)
db.delete_table(ref_table)
def test_rename_fk_column(self):
main_table = 'test_rename_foreign'
ref_table = 'test_rf_ref'
self._create_foreign_tables(main_table, ref_table)
db.execute_deferred_sql()
constraints = db._find_foreign_constraints(main_table, 'foreign_id')
self.assertEquals(len(constraints), 1)
db.rename_column(main_table, 'foreign_id', 'reference_id')
db.execute_deferred_sql() #Create constraints
constraints = db._find_foreign_constraints(main_table, 'reference_id')
self.assertEquals(len(constraints), 1)
db.delete_table(main_table)
db.delete_table(ref_table)
def test_rename_fk_inbound(self):
"""
Tests that the column referred to by an external column can be renamed.
Edge case, but also useful as stepping stone to renaming tables.
"""
main_table = 'test_rename_fk_inbound'
ref_table = 'test_rfi_ref'
self._create_foreign_tables(main_table, ref_table)
db.execute_deferred_sql()
constraints = db._lookup_reverse_constraint(ref_table, 'id')
self.assertEquals(len(constraints), 1)
db.rename_column(ref_table, 'id', 'rfi_id')
db.execute_deferred_sql() #Create constraints
constraints = db._lookup_reverse_constraint(ref_table, 'rfi_id')
self.assertEquals(len(constraints), 1)
cname = db._find_foreign_constraints(main_table, 'foreign_id')[0]
(rtable, rcolumn) = db._lookup_constraint_references(main_table, cname)
self.assertEquals(rcolumn, 'rfi_id')
db.delete_table(main_table)
db.delete_table(ref_table)
def test_rename_constrained_table(self):
"""Renames a table with a foreign key column (towards another table)"""
main_table = 'test_rn_table'
ref_table = 'test_rt_ref'
renamed_table = 'test_renamed_table'
self._create_foreign_tables(main_table, ref_table)
db.execute_deferred_sql()
constraints = db._find_foreign_constraints(main_table, 'foreign_id')
self.assertEquals(len(constraints), 1)
db.rename_table(main_table, renamed_table)
db.execute_deferred_sql() #Create constraints
constraints = db._find_foreign_constraints(renamed_table, 'foreign_id')
self.assertEquals(len(constraints), 1)
(rtable, rcolumn) = db._lookup_constraint_references(
renamed_table, constraints[0])
self.assertEquals(rcolumn, 'id')
db.delete_table(renamed_table)
db.delete_table(ref_table)
def test_renamed_referenced_table(self):
"""Rename a table referred to in a foreign key"""
main_table = 'test_rn_refd_table'
ref_table = 'test_rrt_ref'
renamed_table = 'test_renamed_ref'
self._create_foreign_tables(main_table, ref_table)
db.execute_deferred_sql()
constraints = db._lookup_reverse_constraint(ref_table)
self.assertEquals(len(constraints), 1)
db.rename_table(ref_table, renamed_table)
db.execute_deferred_sql() #Create constraints
constraints = db._find_foreign_constraints(main_table, 'foreign_id')
self.assertEquals(len(constraints), 1)
(rtable, rcolumn) = db._lookup_constraint_references(
main_table, constraints[0])
self.assertEquals(renamed_table, rtable)
db.delete_table(main_table)
db.delete_table(renamed_table)
|
