试图让 postgres 与 Lion 合作。当我运行 rake:db create 我得到：
could not connect to server: Permission denied
Is the server running locally and accepting
connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"?
关于同一问题有很多 SO 主题，但没有一个解决方案对我有用。这是我尝试过的：
- 卸载并重新安装 pg gem
- 安装了 postgres.app（当我连接到本地服务器时，pg 仍然无法工作）
- 更新了路径文件，使 usr/local/bin 位于 usr/bin 之上
- 将 var/pgsql_socket 的权限更改为所有人的读/写权限
可能的提示是，当我运行 which psql 时，结果是 usr/bin/psql - 我相信它应该是 usr/local/bin/psql，但是在直接编辑我的路径文件之后，我不知道为什么它没有改变。Homebrew 对我来说也完全正常（那里没有路径问题）。
有任何想法吗？
编辑 - 我的 database.yml 中有什么：
development:
adapter: postgresql
encoding: unicode
database: hubbed_development
pool: 5
username: hubbed
password:
host: localhost
test:
adapter: postgresql
encoding: unicode
database: hubbed_test
pool: 5
username: hubbed
password:
production:
adapter: postgresql
encoding: unicode
database: hubbed_production
pool: 5
username: hubbed
password:
编辑 - 运行 ps aux | grep postgres：
666 0.0 0.0 2445588 540 ?? Ss 9:42am 0:00.00 postgres: checkpointer process
664 0.0 0.1 2445588 3604 ?? S 9:42am 0:00.02 /Applications/Postgres.app/Contents/MacOS/bin/postgres -D /Users/angsmith/Library/Application Support/Postgres/var -p5432
681 0.0 0.0 2434892 540 s000 S+ 9:43am 0:00.00 grep postgres
670 0.0 0.0 2441868 396 ?? Ss 9:42am 0:00.00 postgres: stats collector process
669 0.0 0.0 2445720 1524 ?? Ss 9:42am 0:00.00 postgres: autovacuum launcher process
668 0.0 0.0 2445588 488 ?? Ss 9:42am 0:00.00 postgres: wal writer process
667 0.0 0.0 2445588 524 ?? Ss 9:42am 0:00.01 postgres: writer process
编辑 - 在 postgress.app 中看到我的用户名是“postgres”。将我的 database.yml 用户名更新为 postgres 并运行 bundle exec rake db:create:all 后，我现在收到以下错误（与以前不同）：
rake aborted!
dlopen(/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/pg-0.14.1/lib/pg_ext.bundle, 9): Library not loaded: /usr/local/lib/libpq.5.5.dylib
Referenced from: /Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/pg-0.14.1/lib/pg_ext.bundle
Reason: image not found - /Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/pg-0.14.1/lib/pg_ext.bundle
/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/pg-0.14.1/lib/pg.rb:4:in `require'
/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/pg-0.14.1/lib/pg.rb:4:in `<top (required)>'
/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `require'
/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `each'
/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `block in require'
/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `each'
/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `require'
/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/gems/bundler-1.2.3/lib/bundler.rb:128:in `require'
/Users/angsmith/hubbedspree/config/application.rb:7:in `<top (required)>'
/Users/angsmith/hubbedspree/Rakefile:5:in `require'
/Users/angsmith/hubbedspree/Rakefile:5:in `<top (required)>'
/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/bin/ruby_noexec_wrapper:14:in `eval'
/Users/angsmith/.rvm/gems/ruby-1.9.3-p374/bin/ruby_noexec_wrapper:14:in `<main>'
(See full trace by running task with --trace)