[我正在Heroku上部署Django网站，并在迁移时遇到此错误。
我的网站已启动并在localhost上运行，但在部署时遇到此错误。
这是我的模特-
from django.db import models
from django.contrib.auth.models import User
from django.db.models.signals import pre_save
from Dipesh_Pal.utils import unique_slug_generator
# Create your models here.
class Home(models.Model):
title = models.CharField(max_length=100)
slug = models.SlugField(max_length=255, null=True, blank=True)
body = models.TextField()
CATEGORY_CHOICES = [
('NEWS', 'News'),
('ANDROID', 'Android'),
('PC', 'PC'),
('OTHERS', 'Others'),
]
category = models.CharField(
max_length=20,
choices=CATEGORY_CHOICES,
default='OTHERS',
)
link = models.URLField(blank=True)
date = models.DateTimeField(auto_now_add=True)
pub_date = models.DateTimeField(auto_now_add=True)
thumb = models.ImageField(default='default.png', blank=True)
author = models.ForeignKey(User, default=None, on_delete=models.CASCADE)
def __str__(self):
return self.title
def snippet(self):
return self.body[:100]+'...'
def get_absolute_url(self):
return '/' + self.title
def slug_generator(sender, instance, *args, **kwargs):
if not instance.slug:
instance.slug = unique_slug_generator(instance)
pre_save.connect(slug_generator, sender=Home)
我在迁移时遇到此错误-
python manage.py migrate
You may have some problem with YouTube
Instagram Followers: 341
You may have some problem with Twitter
Operations to perform:
Apply all migrations: accounts, admin, auth, contenttypes, home, sessions, sites
Running migrations:
Applying contenttypes.0001_initial... OK
Applying auth.0001_initial... OK
Applying accounts.0001_initial... OK
Applying accounts.0002_auto_20190226_1249... OK
Applying admin.0001_initial... OK
Applying admin.0002_logentry_remove_auto_add... OK
Applying admin.0003_logentry_add_action_flag_choices... OK
Applying contenttypes.0002_remove_content_type_name... OK
Applying auth.0002_alter_permission_name_max_length... OK
Applying auth.0003_alter_user_email_max_length... OK
Applying auth.0004_alter_user_username_opts... OK
Applying auth.0005_alter_user_last_login_null... OK
Applying auth.0006_require_contenttypes_0002... OK
Applying auth.0007_alter_validators_add_error_messages... OK
Applying auth.0008_alter_user_username_max_length... OK
Applying auth.0009_alter_user_last_name_max_length... OK
Applying home.0001_initial... OK
Applying home.0002_home_thumb... OK
Applying home.0003_home_author... OK
Applying home.0004_home_trip_number... OK
Applying home.0005_auto_20190104_0239... OK
Applying home.0006_auto_20190104_0239... OK
Applying home.0007_auto_20190104_0242... OK
Applying home.0008_auto_20190104_0244... OK
Applying home.0009_remove_home_link... OK
Applying home.0010_home_link... OK
Applying home.0011_auto_20190105_1138... OK
Applying home.0012_auto_20190226_1249... OK
Applying home.0013_auto_20190228_1615... OK
Applying home.0014_auto_20190306_1623... OK
Applying home.0015_auto_20190518_1502...Traceback (most recent call last):
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
psycopg2.errors.StringDataRightTruncation: value too long for type character varying(2)
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 "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
utility.execute()
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py", line 316, in run_from_argv
self.execute(*args, **cmd_options)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py", line 353, in execute
output = self.handle(*args, **options)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py", line 83, in wrapped
res = handle_func(*args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 203, in handle fake_initial=fake_initial,
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 147, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/operations/fields.py", line 84, in database_forwards
field,
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 435, in add_field
self.execute(sql, params)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 133, in execute
cursor.execute(sql, params)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 100, in execute
return super().execute(sql, params)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers return executor(sql, params, many, context)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
django.db.utils.DataError: value too long for type character varying(2)
我已经尝试更改max_length = 100或max_length = 255，但对我不起作用。
我正在heroku上部署此应用程序，这里是我的github项目“ https://github.com/Dipeshpal/Dipesh-Pal-Django_Website”，并且我正在使用此方法来部署Web应用程序https://youtu.be/MoX36izzEWY
[请帮助我解决此问题，我停留在部署阶段。
在您的/ migrations / versions文件夹中，打开最新的.py文件。它应该有长度调整。类似于：
sa.Column('body', sa.String(length=2), nullable=True),
将2更改为所需值，然后保存，然后再次上传到Heroku。请注意，根据您的情况，该行中的其他项目与上面的有所不同。