我正在按照此处有关如何在一个 Django 项目中处理多个数据库的说明进行操作主题/数据库/多数据库 https://docs.djangoproject.com/en/2.1/topics/db/multi-db/
我已经创建了所需的两个路由器。
它们保存为 ./database_routers/discourse.py 和 ./database_routers/wordpress.py
./database_routers/discourse.py 的内容是
class DiscourseRouter:
"""
A router to control all database operations on models in the
discourse application.
"""
def db_for_read(self, model, **hints):
"""
Attempts to read discourse models go to discourse.
"""
if model._meta.app_label == 'discourse':
return 'discourse'
return None
def db_for_write(self, model, **hints):
"""
Attempts to write discourse models go to discourse.
"""
if model._meta.app_label == 'discourse':
return 'discourse'
return None
def allow_relation(self, obj1, obj2, **hints):
"""
Allow relations if a model in the discourse app is involved.
"""
if obj1._meta.app_label == 'discourse' or \
obj2._meta.app_label == 'discourse':
return True
return None
def allow_migrate(self, db, app_label, model_name=None, **hints):
"""
Make sure the discourse app only appears in the 'discourse'
database.
"""
if app_label == 'discourse':
return db == 'discourse'
return None
./database_routers/wordpress.py 的内容是
class WordpressRouter:
"""
A router to control all database operations on models in the
wordpress application.
"""
def db_for_read(self, model, **hints):
"""
Attempts to read wordpress models go to wordpress.
"""
if model._meta.app_label == 'wordpress':
return 'wordpress'
return None
def db_for_write(self, model, **hints):
"""
Attempts to write wordpress models go to wordpress.
"""
if model._meta.app_label == 'wordpress':
return 'wordpress'
return None
def allow_relation(self, obj1, obj2, **hints):
"""
Allow relations if a model in the wordpress app is involved.
"""
if obj1._meta.app_label == 'wordpress' or \
obj2._meta.app_label == 'wordpress':
return True
return None
def allow_migrate(self, db, app_label, model_name=None, **hints):
"""
Make sure the wordpress app only appears in the 'wordpress'
database.
"""
if app_label == 'wordpress':
return db == 'wordpress'
return None
我创建了一个空的./database_routers/__init__.py
file
我设置的 api/settings 中的数据库路由器设置
DATABASE_ROUTERS = ['database_routers.DiscourseRouter', 'database_routers.WordpressRouter']
当我尝试使用 shell 加我查看项目时
./manage.py shell_plus
I get
ImportError: Module "database_routers" does not define a "DiscourseRouter" attribute/class
如何将数据库路由器添加到 Django 项目中,以便 python 识别路径directory_name.ClassName?