如何使用Flask / Peewee与Heroku？ [英] How to use Flask/Peewee with Heroku?

问题描述

我正在尝试将 Flask 应用程序部署到 Heroku 。我正在使用 Peewee 作为Postgres数据库的ORM。当我按照标准Heroku步骤部署Flask 后，进入 heroku ps：scale web = 1 。这是日志说的：

I am attempting to deploy a Flask app to Heroku. I'm using Peewee as an ORM for a Postgres database. When I follow the standard Heroku steps to deploying Flask, the web process crashes after I enter heroku ps:scale web=1. Here's what the logs say:

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

我尝试了一堆不同的东西来让Heroku允许我的应用程序与Postgres数据库进行通话，但没有任何运气。有没有办法做到这一点？我需要做什么来配置Flask / Peewee，以便我可以在Heroku上使用数据库？

I've tried a bunch of different things to get Heroku to allow my app to talk to a Postgres db, but haven't had any luck. Is there an easy way to do this? What do I need to do to configure Flask/Peewee so that I can use a db on Heroku?

推荐答案

你正在解析DATABASE_URL环境变量？它将看起来像这样：

Are you parsing the DATABASE_URL environment variable? It will look something like this:

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

所以，在打开与数据库的连接之前，您需要将其拉入并解析。根据你如何声明你的数据库（在你的配置文件或你的wsgi应用程序旁边）可能如下所示：

So you will want to pull that in and parse it before you open a connection to your database. Depending on how you've declared your database (in your config or next to your wsgi app) it might look like this:

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,
}

请参阅这里的说明： https：// devcenter。 heroku.com/articles/django

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