在Rails中,无法为{"adapter"=>"postgresql"创建数据库,

Question

我正在尝试运行rake db:create或rake db:setup但是我收到以下错误.这很奇怪,因为rake db:create它与其他Rails项目的其他文件夹一起工作正常.

user:project user$ rake db:create
could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"?
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-    3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:991:in `initialize'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-    3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:991:in `new'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:991:in `connect'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:260:in `initialize'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:27:in `new'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:27:in `postgresql_connection'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-    3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:304:in     `new_connection'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:323:in `checkout_new_connection'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-    3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block (2     levels) in checkout'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-    3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:261:in `loop'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:261:in `block in checkout'
/Users/user/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:260:in `checkout'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:162:in `connection'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:409:in     `retrieve_connection'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_specification.rb:107:in `retrieve_connection'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/connection_adapters/abstract/connection_specification.rb:89:in `connection'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/railties/databases.rake:110:in `rescue in create_database'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/railties/databases.rake:54:in `create_database'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-    3.1.0/lib/active_record/railties/databases.rake:42:in `block (2 levels) in <top (required)>'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/user/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/Users/user/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/Users/user/.rvm/gems/ruby-1.9.2-p290/bin/rake:19:in `load'
/Users/user/.rvm/gems/ruby-1.9.2-p290/bin/rake:19:in `<main>'
Couldn't create database for {"adapter"=>"postgresql", "database"=>"project_test",     "username"=>nil, "password"=>nil, "min_messages"=>"warning"}

这是我的 database.yml

development:
  adapter: postgresql
  database: project_development
  username:
  password:
  min_messages: warning

test:
  adapter: postgresql
  database: project_test
  username:
  password:
  min_messages: warning

production:
  adapter: postgresql
  database: project_production
  username:
  password:
  min_messages: warning

Posgree是专属的/usr/local/var/postgres.不应该rake尝试在同一个文件夹中查找它而不是/var/pgsql_socket/？(反正我没有/ usr/local/var/pgsql_socket)

Answer 1

解决了!

解决方案很容易更新当前安装的宝石.

另一个尝试的解决方案是host: localhost在database.yml文件的开发设置中设置或使用的任何主机.

Answer 2

我通过Homebrew在Mac OS X上安装了PG(我没有意识到它在Mac OS X中是默认的),并且遇到了同样的问题.我可能通过在通过Homebrew安装pg之前安装pg gem来解决问题.

我通过执行以下操作解决了同样的问题:

1. 确保所有二进制文件都指向Cellar目录中的二进制文件(Mac OS X上的/ usr/local/Cellar)
2. 卸载pg gem gem uninstall pg
3. 使用Homebrew配置重新安装gem install pg -- --with-pg-config=/usr/local/bin/pg_config(如果您使用pg setup创建了rails项目,这将在您的database.yml配置文件中进行说明)

它奏效了!

Answer 3

首先，您需要在 Postgres 中手动创建您的用户，同时为该用户授予数据库创建权限（AKA createdb）。

为此，首先，打开 Postgres shell 提示符

$ sudo -u postgres psql

创建您的用户

postgres=# create role Your_DB_username with createdb login password 'YOUR_PASSWORD';

从 Postgres shell 退出

postgres=# \q

做任何与数据库相关的 rake 任务：

$ rake db:create

它会起作用！