无法在 heroku 上进行 RDS 查询

Question

我可以在本地机器上访问我的 RDS postresql 数据库没有问题。

settings.py

DATABASES = {
'default': {
    'ENGINE': 'django.db.backends.postgresql_psycopg2',
    'NAME': 'xxxxxxx',
    'USER': 'XXXXXXXX',
    'PASSWORD': 'XXXXXXXX',
    'HOST': 'XXXXXXrds.amazonaws.com',
    'PORT': '5432',
}

我将其推送到 Heroku，然后在 /saferdb/query/

处收到 ProgrammingError

在 heroku 的 manage.py shell 中，我尝试访问数据库：

>>> from saferdb.models import Question
>>> q = Question.objects.all()
>>> q.count()

出现以下错误：

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.ProgrammingError: relation "saferdb_question" does not exist
LINE 1: SELECT COUNT(*) AS "__count" FROM "saferdb_question"
                                          ^


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/query.py", line 387, in count
    return self.query.get_count(using=self.db)
  File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/sql/query.py", line 491, in get_count
    number = obj.get_aggregation(using, ['__count'])['__count']
  File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/sql/query.py", line 476, in get_aggregation
    result = compiler.execute_sql(SINGLE)
  File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1063, in execute_sql
    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.ProgrammingError: relation "saferdb_question" does not exist
LINE 1: SELECT COUNT(*) AS "__count" FROM "saferdb_question"
                                          ^

Answer 1

错误是因为 table 不存在于数据库中，这意味着您需要迁移数据库模型。如需进一步参考，请阅读 django 迁移 here

heroku中的数据库迁移就是这样完成的，在Procfile文件中指定行。

release: python manage.py migrate
web: gunicorn col.wsgi --log-file -

因此，无论何时部署新代码，heroku 都会自动迁移数据库模型。如需进一步参考，请检查。让我知道这是否有效。

Answer 2

我有一个类似的问题，也是针对 Heroku 应用程序上的 Django。我通过环境变量 DATABASE_URL.

使用了 heroku-django-template to create my app. In settings.py, the default database is overwritten

您可以在 settings.py 中禁用它或将环境变量设置为正确的值。

无法在 heroku 上进行 RDS 查询

unable to make RDS queries on heroku

django

postgresql

heroku

rds