在docker-compose首次构建上配置postgres数据库，以供“ background_tasks”使用

如何解决在docker-compose首次构建上配置postgres数据库，以供“ background_tasks”使用

我有一个很棒的Django项目。该数据库未在存储库中注册。 因此，当我从头开始进行docker-compose时，项目无法找到与“后台任务”相对应的表...

任务是在Django项目开始时立即读取的urls.py中引用的。

在不事先编辑对该表的代码调用的情况下启动项目的方式是什么？

docker-compose：

  version: '3'

  services:
    db:
      image: postgres
      environment:
        - POSTGRES_DB=postgres
        - POSTGRES_USER=postgres
        - POSTGRES_PASSWORD=postgres
        - POSTGRES_HOST_AUTH_METHOD=trust
      ports:
        - "5432:5432"
      volumes:
        - ./postgres-data:/var/lib/postgresql/data
    web:
      build: .
      command: bash -c "
        python manage.py runserver 0.0.0.0:8000
        & python manage.py migrate
        & python manage.py process_tasks"
      volumes:
        - .:/code
      ports:
        - "8000:8000"
        - "5555:5555"
      depends_on:
        - db

记录错误：

db_1   | 2020-10-16 11:48:35.090 UTC [32] ERROR:  relation "background_task" does not exist at character 24
db_1   | 2020-10-16 11:48:35.090 UTC [32] STATEMENT:  SELECT (1) AS "a" FROM "background_task" WHERE "background_task"."verbose_name" = 'zmq_puller' LIMIT 1
db_1   | 2020-10-16 11:48:35.090 UTC [33] ERROR:  relation "background_task" does not exist at character 24
db_1   | 2020-10-16 11:48:35.090 UTC [33] STATEMENT:  SELECT (1) AS "a" FROM "background_task" WHERE "background_task"."verbose_name" = 'zmq_puller' LIMIT 1
web_1  | Traceback (most recent call last):
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py",line 84,in _execute
web_1  |     return self.cursor.execute(sql,params)
web_1  | psycopg2.errors.UndefinedTable: relation "background_task" does not exist
web_1  | LINE 1: SELECT (1) AS "a" FROM "background_task" WHERE "background_t...
web_1  |                                ^
web_1  |
web_1  |
web_1  | The above exception was the direct cause of the following exception:
web_1  |
web_1  | Traceback (most recent call last):
web_1  |   File "/code/manage.py",line 22,in <module>
web_1  | Traceback (most recent call last):
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py",in <module>
web_1  |     main()
web_1  |   File "/code/manage.py",line 18,in main
web_1  |     main()
web_1  |   File "/code/manage.py",in main
web_1  |     execute_from_command_line(sys.argv)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/management/__init__.py",line 401,in execute_from_command_line
web_1  |     utility.execute()
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/management/__init__.py",line 395,in execute
web_1  |     self.fetch_command(subcommand).run_from_argv(self.argv)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py",line 330,in run_from_argv
web_1  |     self.execute(*args,**cmd_options)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py",line 371,in execute
web_1  |     output = self.handle(*args,**options)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py",line 85,in wrapped
web_1  |     res = handle_func(*args,**kwargs)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/management/commands/migrate.py",line 75,in handle
web_1  |     self.check(databases=[database])
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py",line 392,in check
web_1  |     execute_from_command_line(sys.argv)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/management/__init__.py",in execute_from_command_line
web_1  |     all_issues = checks.run_checks(
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/checks/registry.py",line 70,in run_checks
web_1  |     new_errors = check(app_configs=app_configs,databases=databases)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/checks/urls.py",line 13,in check_url_config
web_1  |     return check_resolver(resolver)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/checks/urls.py",line 23,in check_resolver
web_1  |     return check_method()
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/urls/resolvers.py",line 408,in check
web_1  |     utility.execute()
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/management/__init__.py",in execute
web_1  |     for pattern in self.url_patterns:
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/utils/functional.py",line 48,in __get__
web_1  |         self.fetch_command(subcommand).run_from_argv(self.argv)res = instance.__dict__[self.name] = self.func(instance)
web_1  |
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/urls/resolvers.py",line 589,in url_patterns
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py",line 368,in execute
web_1  |     patterns = getattr(self.urlconf_module,"urlpatterns",self.urlconf_module)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/utils/functional.py",in __get__
web_1  |         res = instance.__dict__[self.name] = self.func(instance)self.check()
web_1  |
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/urls/resolvers.py",line 582,in urlconf_module
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py",in check
web_1  |     all_issues = checks.run_checks(
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/checks/registry.py",in run_checks
web_1  |     return import_module(self.urlconf_name)
web_1  |   File "/usr/local/lib/python3.9/importlib/__init__.py",line 127,in import_module
web_1  |     new_errors = check(app_configs=app_configs,in check_url_config
web_1  |         return check_resolver(resolver)return _bootstrap._gcd_import(name[level:],package,level)
web_1  |
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/core/checks/urls.py",in check_resolver
web_1  |   File "<frozen importlib._bootstrap>",line 1030,in _gcd_import
web_1  |     return check_method()
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/urls/resolvers.py",in check
web_1  |     for pattern in self.url_patterns:
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/utils/functional.py",in __get__
web_1  |     res = instance.__dict__[self.name] = self.func(instance)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/urls/resolvers.py",in url_patterns
web_1  |     patterns = getattr(self.urlconf_module,in urlconf_module
web_1  |     return import_module(self.urlconf_name)
web_1  |   File "/usr/local/lib/python3.9/importlib/__init__.py",in import_module
web_1  |       File "<frozen importlib._bootstrap>",line 1007,in _find_and_load
web_1  | return _bootstrap._gcd_import(name[level:],level)
web_1  |   File "<frozen importlib._bootstrap>",in _gcd_import
web_1  |   File "<frozen importlib._bootstrap>",line 986,in _find_and_load_unlocked
web_1  |   File "<frozen importlib._bootstrap>",in _find_and_load
web_1  |   File "<frozen importlib._bootstrap>",line 680,in _load_unlocked
web_1  |   File "<frozen importlib._bootstrap_external>",line 790,in exec_module
web_1  |   File "<frozen importlib._bootstrap>",line 228,in _call_with_frames_removed
web_1  |   File "<frozen importlib._bootstrap>",in _call_with_frames_removed
web_1  |   File "/code/drf_accordion/urls.py",line 45,in <module>
web_1  |   File "/code/drf_accordion/urls.py",in <module>
web_1  |     if not Task.objects.filter(verbose_name="zmq_puller").exists():
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/models/query.py",line 809,in exists
web_1  |     return self.query.has_results(using=self.db)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/query.py",line 535,in has_results
web_1  |     return compiler.has_results()
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/compiler.py",line 1126,in has_results
web_1  |     return bool(self.execute_sql(SINGLE))
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/compiler.py",line 1156,in execute_sql
web_1  |     cursor.execute(sql,params)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py",line 98,in execute
web_1  |     return super().execute(sql,line 66,in execute
web_1  |     return self._execute_with_wrappers(sql,params,many=False,executor=self._execute)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py",in _execute_with_wrappers
web_1  |     return executor(sql,many,context)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py",params)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/utils.py",line 90,in __exit__
web_1  |     if not Task.objects.filter(verbose_name="zmq_puller").exists():
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/models/query.py",in exists
web_1  |         return self.query.has_results(using=self.db)
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/query.py",in has_results
web_1  | raise dj_exc_value.with_traceback(traceback) from exc_value    return compiler.has_results()
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/compiler.py",in has_results
web_1  |
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py",in _execute
web_1  |     return bool(self.execute_sql(SINGLE))
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/compiler.py",in execute_sql
web_1  |     return self.cursor.execute(sql,params)
web_1  | django.db.utils.ProgrammingError: relation "background_task" does not exist
web_1  | LINE 1: SELECT (1) AS "a" FROM "background_task" WHERE "background_t...
web_1  |                                ^
web_1  |
web_1  |     cursor.execute(sql,in __exit__
web_1  |     raise dj_exc_value.with_traceback(traceback) from exc_value
web_1  |   File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py",params)
web_1  | django.db.utils.ProgrammingError: relation "background_task" does not exist
web_1  | LINE 1: SELECT (1) AS "a" FROM "background_task" WHERE "background_t...

感谢您阅读！

解决方法

确保已将background_task添加到INSTALLED_APPS：https://github.com/arteria/django-background-tasks/blob/master/docs/index.rst#installation

,

确保在应用迁移后运行服务器。
尝试更改此设置。

version: '3'
    ...
    web:    
        build: .
        command: bash -c "    
        python manage.py runserver 0.0.0.0:8000
        & python manage.py migrate
        & python manage.py process_tasks"
     ...

为此。

version: '3'.  
    ...
    web:    
      build: .    
      command: bash -c "
        python manage.py migrate
        & python manage.py runserver 0.0.0.0:8000
        & python manage.py process_tasks"
     ...