如何在Heroku中使用Flask / Peewee？

我正在尝试将Flask应用程序部署到Heroku.我使用Peewee作为Postgres数据库的ORM.当我按照standard Heroku steps to deploying Flask时,在我输入heroku ps：scale web = 1后,Web进程崩溃.这是日志所说的内容：

Starting process with command `python app.py`
/app/.heroku/venv/lib/python2.7/site-packages/peewee.py:2434: UserWarning: Table for <class 'flask_peewee.auth.User'> ("user") is reserved, please override using Meta.db_table
cls, _Meta.db_table,
Traceback (most recent call last):
File "app.py", line 167, in <module>
auth.User.create_table(fail_silently=True)
File "/app/.heroku/venv/lib/python2.7/site-packages/peewee.py", line 2518, in create_table if fail_silently and cls.table_exists():
File "/app/.heroku/venv/lib/python2.7/site-packages/peewee.py", line 2514, in table_exists return cls._Meta.db_table in cls._Meta.database.get_tables()
File "/app/.heroku/venv/lib/python2.7/site-packages/peewee.py", line 507, in get_tables ORDER BY c.relname""")
File "/app/.heroku/venv/lib/python2.7/site-packages/peewee.py", line 313, in execute cursor = self.get_cursor()
File "/app/.heroku/venv/lib/python2.7/site-packages/peewee.py", line 310, in get_cursor return self.get_conn().cursor()
File "/app/.heroku/venv/lib/python2.7/site-packages/peewee.py", line 306, in get_conn self.connect()
File "/app/.heroku/venv/lib/python2.7/site-packages/peewee.py", line 296, in connect self.__local.conn = self.adapter.connect(self.
database, **self.connect_kwargs)
File "/app/.heroku/venv/lib/python2.7/site-packages/peewee.py", line 199, in connect return psycopg2.connect(database=database, **kwargs)
File "/app/.heroku/venv/lib/python2.7/site-packages/psycopg2/__init__.py", line 179, in connect connection_factory=connection_factory, async=async)
psycopg2.OperationalError: Could not connect to server: No such file or directory
Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGsql.5432"?
Process exited with status 1
State changed from starting to crashed

我尝试了很多不同的东西让Heroku允许我的应用程序与Postgres数据库交谈,但没有任何运气.是否有捷径可寻？我需要做什么来配置Flask / peewee以便我可以在Heroku上使用db？

解决方法:

您正在解析DATABASE_URL环境变量吗？它看起来像这样：

postgres://username:password@host:port/database_name

因此,在打开与数据库的连接之前,您需要将其拉入并解析它.根据您声明数据库的方式(在您的配置中或wsgi应用旁边),它可能如下所示：

import os
import urlparse

urlparse.uses_netloc.append('postgres')
url = urlparse.urlparse(os.environ['DATABASE_URL'])

# for your config
DATABASE = {
    'engine': 'peewee.PostgresqlDatabase',
    'name': url.path[1:],
    'password': url.password,
    'host': url.hostname,
    'port': url.port,
}

请参阅此处的注释：https://devcenter.heroku.com/articles/django