如果你在你的服务器上安装了 postresql，那么只需将主机:localhost 放到 database.yml，我通常会把它放在它说 pool: 5 的地方.否则如果它是不是 localhost 肯定会告诉该应用程序在哪里可以找到它的数据库.

If you installed postresql on your server then just host: localhost to database.yml, I usually throw it in around where it says pool: 5. Otherwise if it's not localhost definitely tell that app where to find its database.

development:
  adapter: postgresql
  encoding: unicode
  database: kickrstack_development
  host: localhost
  pool: 5
  username: kickrstack
  password: secret

通过创建数据库并将所有权分配给应用的用户以建立连接，确保您的用户凭据设置正确.要在 postgresql 9 中创建一个新用户，请运行:

Make sure your user credentials are set correctly by creating a database and assigning ownership to your app's user to establish the connection. To create a new user in postgresql 9 run:

sudo -u postgres psql

如果还没有设置 postgresql 用户密码，它只是反斜杠密码.

set the postgresql user password if you haven't, it's just backslash password.

postgres=# password

创建新用户和密码以及用户的新数据库:

Create a new user and password and the user's new database:

postgres=# create user "guy_on_***" with password 'keepitonthedl';
postgres=# create database "dcaclab_development" owner "guy_on_***"; 

在您确认创建数据库、用户、密码并设置这些权限后，现在更新您的 database.yml 文件.不要忘记主机:localhost.

Now update your database.yml file after you've confirmed creating the database, user, password and set these privileges. Don't forget host: localhost.