Question

我想从mysql更改为postgresql。我不关心数据所以我更改了database.yml：

default: &default
  adapter: postgresql
  pool: 5
  timeout: 5000

development:
  <<: *default
  database: db/development.postgresql

test:
  <<: *default
  database: db/test.postgresql

production:
  <<: *default
  database: db/production.postgresql

然后运行

rails db:reset db:migrate

但我收到错误

rails aborted!
PG::ConnectionBad: 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"?

我已经重新启动了IDE（使用c9）和服务器，但它没有起作用。知道如何解决这个问题吗？

@Edit启动sudo service postgresql start服务器后启动，然后运行rails db:create

我收到错误：

psql: FATAL:  role "ubuntu" does not exist

Answer 1

只需在您的终端中运行：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    Parse.enableLocalDatastore()

     Parse.setApplicationId("d602af8b-bba8-4f52-9c10-c367bcff49", clientKey: "https://parse.buddy.com/parse")        
    PFUser.enableAutomaticUser()
    let defaultACL = PFACL();

    // If you would like all objects to be private by default, remove this line.
    //defaultACL.getPublicReadAccess = true

    PFACL.setDefault(defaultACL, withAccessForCurrentUser: true)

    if application.applicationState != UIApplicationState.background {
        // Track an app open here if we launch with a push, unless
        // "content_available" was used to trigger a background push (introduced in iOS 7).
        // In that case, we skip tracking here to avoid double counting the app-open.

        let preBackgroundPush = !application.responds(to: #selector(getter: UIApplication.backgroundRefreshStatus))
        let oldPushHandlerOnly = !self.responds(to: #selector(UIApplicationDelegate.application(_:didReceiveRemoteNotification:fetchCompletionHandler:)))
        var noPushPayload = false;
        if let options = launchOptions {
            noPushPayload = options[UIApplicationLaunchOptionsKey.remoteNotification] != nil;
        }
        if (preBackgroundPush || oldPushHandlerOnly || noPushPayload) {
            PFAnalytics.trackAppOpened(launchOptions: launchOptions)
        }
    }


    return true
}

这是因为上次关闭计算机时，Postgresql没有正常退出（通常是由于电池耗尽）。

Answer 2

我找到了答案：

sudo service postgresql start
$ echo $USER
$ sudo su - postgres;
$ createuser ubuntu -dslP
$ sudo sudo -u postgres psql
创建数据库myapp_development owner = ubuntu;

然后将我的database.yml文件更改为：

  development:
    adapter: postgresql
    encoding: SQL_ASCII
    database: cc_database
    pool: 5
    username: ubuntu
    password: password

rails db:reset

从mysql过渡到postgress错误

2 个答案: