如何将部署的 rails 应用程序连接到现有的 Heroku 数据库

Question

I launched my Rails application on Heroku. And I want to connect it to the database of an existing project of my friend, which is also deployed on Heroku. A friend gave me credentials and url to the database. However, I do not understand how to connect my project to my friend's database. I tried to change DABASE _URL but all is useless. Also, credential data was placed in database.yml and when I run the heroku run db:setup in the heroku terminal i get

FATAL: permission denied for database "postgres" DETAIL: User does not have CONNECT privilege. Couldn't create '*************' database. Please check your configuration. rake aborted! PG::ConnectionBad: FATAL: permission denied for database "postgres" DETAIL: User does not have CONNECT privilege

Answer 1

Use following steps:

1) Add DATABASE_URL (complete url username, password, host) under settings / Config Vars.

2) For Rails apps you should look to use db:schema:load, db:structure:load or db:migrate instead of db:setup .

here is more info about issue https://help.heroku.com/63D7ALXT/why-am-i-seeing-user-does-not-have-connect-privilege-error-with-heroku-postgres-on-review-apps

You can share a single Heroku Postgres database between multiple apps with the heroku addons:attach command

heroku addons:attach my-originating-app::DATABASE --app new_app

for more info check here https://devcenter.heroku.com/articles/heroku-postgresql#sharing-heroku-postgres-between-applications

hope this helps

Answer 2

The reason you cannot update DATABASE_URL is because it's currently pointing at another database without any auxiliary attachments. This is a safety mechanism to prevent users from accidentally shooting themselves in the foot. This should allow for your changes.

1. heroku addons:attach <addon name, eg postgresql-cloudy-12345> --as ORIGINAL_DB --app <app name>
   • This will create an additional attachment name so you don't lose reference to the original database
2. heroku addons:detach DATABASE_URL --app <app name>
   • This will remove the Heroku-managed DATABASE_URL config var.
3. heroku config:set DATABASE_URL=<the connection string for the other database> --app <app name>
   • This sets DATABASE_URL to point at the other database which should put things into an operable state.*

* This caveat here is that this is a brittle configuration because hostnames can change for databases. If the db undergoes maintenance you will need to manually change the config var (ie repeat step 3).

Answer 3

我通过转到 heroku.com 到我的应用程序然后设置然后配置变量解决了这种情况 DATABASE_URL 与 ORIGINAL_DB_URL 不同，所以我将 DATABASE_URL 更改为类似于 ORIGINAL_DB_URL 在我的情况下：postgres://quxhxkemlsfzzv:964c7 .... ......