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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
|
from django.db.models.signals import post_save, pre_save
from django.test import TestCase
from .models import Account, Employee, Person, Profile, ProxyEmployee
class UpdateOnlyFieldsTests(TestCase):
msg = (
"The following fields do not exist in this model, are m2m fields, or "
"are non-concrete fields: %s"
)
def test_update_fields_basic(self):
s = Person.objects.create(name="Sara", gender="F")
self.assertEqual(s.gender, "F")
s.gender = "M"
s.name = "Ian"
s.save(update_fields=["name"])
s = Person.objects.get(pk=s.pk)
self.assertEqual(s.gender, "F")
self.assertEqual(s.name, "Ian")
def test_update_fields_deferred(self):
s = Person.objects.create(name="Sara", gender="F", pid=22)
self.assertEqual(s.gender, "F")
s1 = Person.objects.defer("gender", "pid").get(pk=s.pk)
s1.name = "Emily"
s1.gender = "M"
with self.assertNumQueries(1):
s1.save()
s2 = Person.objects.get(pk=s1.pk)
self.assertEqual(s2.name, "Emily")
self.assertEqual(s2.gender, "M")
def test_update_fields_only_1(self):
s = Person.objects.create(name="Sara", gender="F")
self.assertEqual(s.gender, "F")
s1 = Person.objects.only("name").get(pk=s.pk)
s1.name = "Emily"
s1.gender = "M"
with self.assertNumQueries(1):
s1.save()
s2 = Person.objects.get(pk=s1.pk)
self.assertEqual(s2.name, "Emily")
self.assertEqual(s2.gender, "M")
def test_update_fields_only_2(self):
s = Person.objects.create(name="Sara", gender="F", pid=22)
self.assertEqual(s.gender, "F")
s1 = Person.objects.only("name").get(pk=s.pk)
s1.name = "Emily"
s1.gender = "M"
with self.assertNumQueries(2):
s1.save(update_fields=["pid"])
s2 = Person.objects.get(pk=s1.pk)
self.assertEqual(s2.name, "Sara")
self.assertEqual(s2.gender, "F")
def test_update_fields_only_repeated(self):
s = Person.objects.create(name="Sara", gender="F")
self.assertEqual(s.gender, "F")
s1 = Person.objects.only("name").get(pk=s.pk)
s1.gender = "M"
with self.assertNumQueries(1):
s1.save()
# save() should not fetch deferred fields
s1 = Person.objects.only("name").get(pk=s.pk)
with self.assertNumQueries(1):
s1.save()
def test_update_fields_inheritance_defer(self):
profile_boss = Profile.objects.create(name="Boss", salary=3000)
e1 = Employee.objects.create(
name="Sara", gender="F", employee_num=1, profile=profile_boss
)
e1 = Employee.objects.only("name").get(pk=e1.pk)
e1.name = "Linda"
with self.assertNumQueries(1):
e1.save()
self.assertEqual(Employee.objects.get(pk=e1.pk).name, "Linda")
def test_update_fields_fk_defer(self):
profile_boss = Profile.objects.create(name="Boss", salary=3000)
profile_receptionist = Profile.objects.create(name="Receptionist", salary=1000)
e1 = Employee.objects.create(
name="Sara", gender="F", employee_num=1, profile=profile_boss
)
e1 = Employee.objects.only("profile").get(pk=e1.pk)
e1.profile = profile_receptionist
with self.assertNumQueries(1):
e1.save()
self.assertEqual(Employee.objects.get(pk=e1.pk).profile, profile_receptionist)
e1.profile_id = profile_boss.pk
with self.assertNumQueries(1):
e1.save()
self.assertEqual(Employee.objects.get(pk=e1.pk).profile, profile_boss)
def test_select_related_only_interaction(self):
profile_boss = Profile.objects.create(name="Boss", salary=3000)
e1 = Employee.objects.create(
name="Sara", gender="F", employee_num=1, profile=profile_boss
)
e1 = (
Employee.objects.only("profile__salary")
.select_related("profile")
.get(pk=e1.pk)
)
profile_boss.name = "Clerk"
profile_boss.salary = 1000
profile_boss.save()
# The loaded salary of 3000 gets saved, the name of 'Clerk' isn't
# overwritten.
with self.assertNumQueries(1):
e1.profile.save()
reloaded_profile = Profile.objects.get(pk=profile_boss.pk)
self.assertEqual(reloaded_profile.name, profile_boss.name)
self.assertEqual(reloaded_profile.salary, 3000)
def test_update_fields_m2m(self):
profile_boss = Profile.objects.create(name="Boss", salary=3000)
e1 = Employee.objects.create(
name="Sara", gender="F", employee_num=1, profile=profile_boss
)
a1 = Account.objects.create(num=1)
a2 = Account.objects.create(num=2)
e1.accounts.set([a1, a2])
with self.assertRaisesMessage(ValueError, self.msg % "accounts"):
e1.save(update_fields=["accounts"])
def test_update_fields_inheritance(self):
profile_boss = Profile.objects.create(name="Boss", salary=3000)
profile_receptionist = Profile.objects.create(name="Receptionist", salary=1000)
e1 = Employee.objects.create(
name="Sara", gender="F", employee_num=1, profile=profile_boss
)
e1.name = "Ian"
e1.gender = "M"
e1.save(update_fields=["name"])
e2 = Employee.objects.get(pk=e1.pk)
self.assertEqual(e2.name, "Ian")
self.assertEqual(e2.gender, "F")
self.assertEqual(e2.profile, profile_boss)
e2.profile = profile_receptionist
e2.name = "Sara"
e2.save(update_fields=["profile"])
e3 = Employee.objects.get(pk=e1.pk)
self.assertEqual(e3.name, "Ian")
self.assertEqual(e3.profile, profile_receptionist)
with self.assertNumQueries(1):
e3.profile = profile_boss
e3.save(update_fields=["profile_id"])
e4 = Employee.objects.get(pk=e3.pk)
self.assertEqual(e4.profile, profile_boss)
self.assertEqual(e4.profile_id, profile_boss.pk)
def test_update_fields_inheritance_with_proxy_model(self):
profile_boss = Profile.objects.create(name="Boss", salary=3000)
profile_receptionist = Profile.objects.create(name="Receptionist", salary=1000)
e1 = ProxyEmployee.objects.create(
name="Sara", gender="F", employee_num=1, profile=profile_boss
)
e1.name = "Ian"
e1.gender = "M"
e1.save(update_fields=["name"])
e2 = ProxyEmployee.objects.get(pk=e1.pk)
self.assertEqual(e2.name, "Ian")
self.assertEqual(e2.gender, "F")
self.assertEqual(e2.profile, profile_boss)
e2.profile = profile_receptionist
e2.name = "Sara"
e2.save(update_fields=["profile"])
e3 = ProxyEmployee.objects.get(pk=e1.pk)
self.assertEqual(e3.name, "Ian")
self.assertEqual(e3.profile, profile_receptionist)
def test_update_fields_signals(self):
p = Person.objects.create(name="Sara", gender="F")
pre_save_data = []
def pre_save_receiver(**kwargs):
pre_save_data.append(kwargs["update_fields"])
pre_save.connect(pre_save_receiver)
post_save_data = []
def post_save_receiver(**kwargs):
post_save_data.append(kwargs["update_fields"])
post_save.connect(post_save_receiver)
p.save(update_fields=["name"])
self.assertEqual(len(pre_save_data), 1)
self.assertEqual(len(pre_save_data[0]), 1)
self.assertIn("name", pre_save_data[0])
self.assertEqual(len(post_save_data), 1)
self.assertEqual(len(post_save_data[0]), 1)
self.assertIn("name", post_save_data[0])
pre_save.disconnect(pre_save_receiver)
post_save.disconnect(post_save_receiver)
def test_update_fields_incorrect_params(self):
s = Person.objects.create(name="Sara", gender="F")
with self.assertRaisesMessage(ValueError, self.msg % "first_name"):
s.save(update_fields=["first_name"])
# "name" is treated as an iterable so the output is something like
# "n, a, m, e" but the order isn't deterministic.
with self.assertRaisesMessage(ValueError, self.msg % ""):
s.save(update_fields="name")
def test_empty_update_fields(self):
s = Person.objects.create(name="Sara", gender="F")
pre_save_data = []
def pre_save_receiver(**kwargs):
pre_save_data.append(kwargs["update_fields"])
pre_save.connect(pre_save_receiver)
post_save_data = []
def post_save_receiver(**kwargs):
post_save_data.append(kwargs["update_fields"])
post_save.connect(post_save_receiver)
# Save is skipped.
with self.assertNumQueries(0):
s.save(update_fields=[])
# Signals were skipped, too...
self.assertEqual(len(pre_save_data), 0)
self.assertEqual(len(post_save_data), 0)
pre_save.disconnect(pre_save_receiver)
post_save.disconnect(post_save_receiver)
def test_num_queries_inheritance(self):
s = Employee.objects.create(name="Sara", gender="F")
s.employee_num = 1
s.name = "Emily"
with self.assertNumQueries(1):
s.save(update_fields=["employee_num"])
s = Employee.objects.get(pk=s.pk)
self.assertEqual(s.employee_num, 1)
self.assertEqual(s.name, "Sara")
s.employee_num = 2
s.name = "Emily"
with self.assertNumQueries(1):
s.save(update_fields=["name"])
s = Employee.objects.get(pk=s.pk)
self.assertEqual(s.name, "Emily")
self.assertEqual(s.employee_num, 1)
# A little sanity check that we actually did updates...
self.assertEqual(Employee.objects.count(), 1)
self.assertEqual(Person.objects.count(), 1)
with self.assertNumQueries(2):
s.save(update_fields=["name", "employee_num"])
def test_update_non_concrete_field(self):
profile_boss = Profile.objects.create(name="Boss", salary=3000)
with self.assertRaisesMessage(ValueError, self.msg % "non_concrete"):
profile_boss.save(update_fields=["non_concrete"])
|
