我刚刚在本地对我的Django模型进行了一些更改，为它们进行了迁移，并将这些迁移推送到我的生产服务器。一切都在本地工作正常，但当我尝试在生产服务器中执行迁移时，我收到此错误。零指数让我失望。其依赖的模型，teamsafetytracker是新的，页面部分从未依赖它直到现在，所以我不确定为什么它甚至会在teamafetytracker表中查找实例？
django.db.utils.IntegrityError: insert or update on table "page_content_pagesection" violates foreign key constraint "page_co_safety_tracker_id_f30c4360_fk_team_teamsafetytracker_id"
DETAIL: Key (safety_tracker_id)=(0) is not present in table "team_teamsafetytracker".
相关迁移
class Migration(migrations.Migration):
dependencies = [
('team', '0037_remove_teampagesection_multi_tracker_one'),
]
operations = [
migrations.RemoveField(
model_name='team',
name='safety_clock_start',
),
]
class Migration(migrations.Migration):
dependencies = [
('team', '0038_remove_team_safety_clock_start'),
('page_content', '0017_auto_20170926_1436'),
]
operations = [
migrations.RemoveField(
model_name='webpage',
name='safety_clock_start',
),
migrations.AddField(
model_name='pagesection',
name='multi_tracker_three',
field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='page_multi_three', to='team.TeamSafetyTracker'),
),
migrations.AddField(
model_name='pagesection',
name='multi_tracker_two',
field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='page_multi_two', to='team.TeamSafetyTracker'),
),
migrations.AddField(
model_name='pagesection',
name='tracker_side',
field=models.CharField(choices=[(b'L', b'Left'), (b'T', b'Three Section'), (b'R', b'Right')], default=b'R', max_length=20),
),
migrations.AlterField(
model_name='pagesection',
name='safety_tracker',
field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='page_section', to='team.TeamSafetyTracker'),
),
]
模型
class TeamSafetyTracker(models.Model):
name = models.CharField(max_length=255)
label = models.CharField(max_length=200)
team = models.ForeignKey('Team')
safety_clock_start = models.DateTimeField(help_text="Date Since Last Accident. Used if You Have Page Sections That Include a Safety Tracker", null=True, blank=True)
create_date = models.DateTimeField(auto_now_add=True)
class Meta:
verbose_name = 'Team Safety Tracker'
verbose_name_plural = 'Team Safety Trackers'
def __str__(self):
return self.name
class PageSection(models.Model):
page = models.ForeignKey(WebPage)
title = models.CharField(max_length=255, null=True, blank=True)
content = models.TextField(null=True, blank=True)
has_gallery = models.BooleanField(default=False)
gallery = models.ForeignKey('PhotoGallery', null=True, blank=True)
safety_tracker = models.ForeignKey(TeamSafetyTracker, related_name='page_section', null=True, blank=True)
multi_tracker_two = models.ForeignKey(TeamSafetyTracker, related_name='page_multi_two', null=True, blank=True)
multi_tracker_three = models.ForeignKey(TeamSafetyTracker, related_name='page_multi_three', null=True, blank=True)
tracker_side = models.CharField(max_length=20, choices=TRACKER_SIDES, default='R')
background_choices = models.CharField(max_length=100, choices=BACKGROUND_CHOICES, default='WH')
display_order = models.IntegerField(default=1)
is_published = models.BooleanField(default=True)
def __str__(self):
return ('Section %s') % self.display_order
class Meta:
verbose_name = 'Section'
verbose_name_plural = 'Sections'
ordering = ('display_order',)
def gallery_sets(self):
if self.gallery:
gallery_photos = self.gallery.photos.filter(is_published=True)
set_1 = gallery_photos[:10]
gallery_sets = [set_1]
if gallery_photos.count() > 10:
set_2 = gallery_photos[10:20]
gallery_sets.append(set_2)
if gallery_photos.count() > 20:
set_3 = gallery_photos[20:30]
gallery_sets.append(set_3)
if gallery_photos.count() > 30:
set_4 = gallery_photos[30:40]
gallery_sets.append(set_4)
if gallery_photos.count() > 40:
set_5 = gallery_photos[40:50]
gallery_sets.append(set_5)
return gallery_sets
else:
return []
@staticmethod
def get_published_objects():
objects = PageSection.objects.filter(is_published=True).order_by('display_order')
return objects
回溯
Running migrations:
Rendering model states... DONE
Applying team.0032_teamsafetytracker... OK
Applying team.0033_auto_20180306_1928... OK
Applying team.0034_auto_20180306_1942... OK
Applying team.0035_auto_20180306_1944... OK
Applying team.0036_auto_20180306_1953... OK
Applying team.0037_remove_teampagesection_multi_tracker_one... OK
Applying team.0038_remove_team_safety_clock_start... OK
Applying page_content.0018_auto_20180307_1851...Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
psycopg2.IntegrityError: insert or update on table "page_content_pagesection" violates foreign key constraint "page_co_safety_tracker_id_f30c4360_fk_team_teamsafetytracker_id"
DETAIL: Key (safety_tracker_id)=(0) is not present in table "team_teamsafetytracker".
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python3.5/dist-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python3.5/dist-packages/django/core/management/__init__.py", line 345, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python3.5/dist-packages/django/core/management/base.py", line 348, in run_from_argv
self.execute(*args, **cmd_options)
File "/usr/local/lib/python3.5/dist-packages/django/core/management/base.py", line 399, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python3.5/dist-packages/django/core/management/commands/migrate.py", line 200, in handle
executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python3.5/dist-packages/django/db/migrations/executor.py", line 92, in migrate
self._migrate_all_forwards(plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python3.5/dist-packages/django/db/migrations/executor.py", line 121, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python3.5/dist-packages/django/db/migrations/executor.py", line 198, in apply_migration
state = migration.apply(state, schema_editor)
File "/usr/local/lib/python3.5/dist-packages/django/db/migrations/migration.py", line 123, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/usr/local/lib/python3.5/dist-packages/django/db/migrations/operations/fields.py", line 201, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/base/schema.py", line 482, in alter_field
old_db_params, new_db_params, strict)
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/postgresql/schema.py", line 116, in _alter_field
new_db_params, strict,
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/base/schema.py", line 717, in _alter_field
self.execute(self._create_fk_sql(model, new_field, "_fk_%(to_table)s_%(to_column)s"))
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/base/schema.py", line 110, in execute
cursor.execute(sql, params)
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "/usr/local/lib/python3.5/dist-packages/django/db/utils.py", line 95, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/usr/local/lib/python3.5/dist-packages/django/utils/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
django.db.utils.IntegrityError: insert or update on table "page_content_pagesection" violates foreign key constraint "page_co_safety_tracker_id_f30c4360_fk_team_teamsafetytracker_id"
DETAIL: Key (safety_tracker_id)=(0) is not present in table "team_teamsafetytracker".
答案 0 :(得分：1)
这似乎是Pagesection表中旧值的问题，即。有一个PageSection条目，其中 safety_tracker 已经为0（此字段以前是IntegerField）。当您将其更改为ForeignKey to TeamSafetyTracker时，Django尝试将旧值与TeamSafetyTracker ID匹配。
在运行 page_content.0018_auto_20180307_1851 迁移之前，请确保列 safety_tracker 的所有值都设置为null。您可以创建自定义迁移来执行此操作。