我一直在研究不同的应用程序，现在决定将它们重组在一个项目中。我已经浏览了Django docs关于多个数据库和各种帖子的SO，但我无法使其正常工作。我的问题是，当我运行manage.py migrate
到目前为止，我已尝试删除默认数据库（包含迁移历史记录）并清空每个迁移文件夹。之后，我在this帖子中发布makemigrations && migrate --fake && migrate。但是，虽然我获得了消息成功，但是没有在PostgreSQL中创建表。
Running migrations:
Applying auth.0008_alter_user_username_max_length... FAKED
Applying auth.0009_alter_user_last_name_max_length... FAKED
Applying notifications.0001_initial... FAKED
Applying sessions.0001_initial... FAKED
Applying watson.0001_initial... FAKED
(venv) C:\Users\USER\Documents\OutilsBU>python manage.py migrate
Operations to perform:
Apply all migrations: Chronos, Competences, Syc, admin, auth, contenttypes, notifications, sessions, watson
Running migrations:
No migrations to apply.
如果我重新清空迁移文件夹并删除django数据库并重新运行makemigrations并在没有假步骤的情况下迁移我只是得到此错误（表未创建）。
Operations to perform:
Apply all migrations: Chronos, Competences, Syc, admin, auth, contenttypes, notifications, sessions, watson
Running migrations:
Applying contenttypes.0001_initial... OK
Applying auth.0001_initial... OK
Applying Chronos.0001_initial... OK
Applying Competences.0001_initial... OK
Applying Syc.0001_initial... OK
Applying admin.0001_initial... OK
Applying admin.0002_logentry_remove_auto_add... 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...Traceback (most recent call last):
File "C:\Users\USER\Envs\venv\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
psycopg2.ProgrammingError: ERREUR: Relation « Chronos_echange » does not exist.
以下是我的设置配置和db_router文件。我正在使用Django 2和PostgreSQL 9.6。提前感谢您的帮助。
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'django_db',
'USER': 'postgres',
'PASSWORD': 'postgres',
'HOST': '127.0.0.1',
'PORT': '5432',
},
'sycoma_db':{
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'sycoma_db',
'USER': 'postgres',
'PASSWORD': 'postgres',
'HOST': '127.0.0.1',
'PORT': '5432',
},
'chronos_db':{
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'chronos_db',
'USER': 'postgres',
'PASSWORD': 'postgres',
'HOST': '127.0.0.1',
'PORT': '5432',
},
'skills_db':{
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'skills_db',
'USER': 'postgres',
'PASSWORD': 'postgres',
'HOST': '127.0.0.1',
'PORT': '5432',
},
}
DATABASE_ROUTERS = ['OutilsBU.db_router.SycRouter', 'OutilsBU.db_router.ChronosRouter', 'OutilsBU.db_router.CompetencesRouter']
class SycRouter:
"""
A router to control all database operations on models in the
Syc application.
"""
def db_for_read(self, model, **hints):
"""
Attempts to readSyc models go toSyc_db.
"""
if model._meta.app_label == 'Syc':
return 'sycoma_db'
return None
def db_for_write(self, model, **hints):
"""
Attempts to writeSyc models go to sycoma_db.
"""
if model._meta.app_label == 'Syc':
return 'sycoma_db'
return None
def allow_relation(self, obj1, obj2, **hints):
"""
Allow relations if a model in theSyc app is involved.
"""
if obj1._meta.app_label == 'Syc' or \
obj2._meta.app_label == 'Syc':
return True
return None
def allow_migrate(self, db, app_label, model_name=None, **hints):
"""
Make sure the Syc app only appears in the 'sycoma_db'
database.
"""
if app_label == 'Syc':
return db == 'sycoma_db'
return None
class ChronosRouter:
"""
A router to control all database operations on models in the
Syc application.
"""
def db_for_read(self, model, **hints):
if model._meta.app_label == 'Chronos':
return 'chronos_db'
return None
def db_for_write(self, model, **hints):
"""
Attempts to writeSyc models go to sycoma_db.
"""
if model._meta.app_label == 'Chronos':
return 'chronos_db'
return None
def allow_relation(self, obj1, obj2, **hints):
"""
Allow relations if a model in theSyc app is involved.
"""
if obj1._meta.app_label == 'Chronos' or \
obj2._meta.app_label == 'Chronos':
return True
return None
def allow_migrate(self, db, app_label, model_name=None, **hints):
"""
Make sure the Syc app only appears in the 'sycoma_db'
database.
"""
if app_label == 'Chronos':
return db == 'chronos_db'
return None
class CompetencesRouter:
"""
A router to control all database operations on models in the
Syc application.
"""
def db_for_read(self, model, **hints):
if model._meta.app_label == 'Competences':
return 'skills_db'
return None
def db_for_write(self, model, **hints):
"""
Attempts to writeSyc models go to sycoma_db.
"""
if model._meta.app_label == 'Competences':
return 'skills_db'
return None
def allow_relation(self, obj1, obj2, **hints):
"""
Allow relations if a model in theSyc app is involved.
"""
if obj1._meta.app_label == 'Competences' or \
obj2._meta.app_label == 'Competences':
return True
return None
def allow_migrate(self, db, app_label, model_name=None, **hints):
"""
Make sure the Syc app only appears in the 'sycoma_db'
database.
"""
if app_label == 'Competences':
return db == 'skills_db'
return None
答案 0 :(得分：0)
我终于明白了！为了调试我的问题，我为每个应用程序运行了python manage.py app_n --database app_n_db。
最后，事情是其中一个子应用程序模型有一个指向django默认用户模型的ForeignKey。由于我没有为它定义特定的数据库，因此它使用默认设置进行存储，因此无法从应用程序数据库进行访问。