使用橡胶部署时启用hstore

Question

我正在部署一个使用PostgreSQL和HSTORE的Rails应用程序.

为了部署它,我正在使用橡胶.

一切正常,但HSTORE未正确启用除外.当包含execute("CREATE EXTENSION hstore")运行的迁移时,我收到以下错误:

** [out :: production.---] 
** [out :: production.---] -- execute("CREATE EXTENSION hstore")
** [out :: production.---] 
** [out :: production.---] rake aborted!
** [out :: production.---] An error has occurred, this and all later migrations canceled:
** [out :: production.---] 
** [out :: production.---] PG::Error: ERROR:  permission denied to create extension "hstore"
** [out :: production.---] HINT:  Must be superuser to create this extension.

创建postgres实例的脚本具有以下代码:

create_user_cmd = "CREATE USER #{env.db_user} WITH NOSUPERUSER CREATEDB NOCREATEROLE"

所以我认为问题可能与NOSUPERUSER此处设置的属性有关.

有没有办法使用橡胶启用hstore,同时保持大多数生成的文件不变？

Answer 1

问题是橡胶创建了DB用户NOSUPERUSER.我的解决方法是创建在capistrano之前和之后运行的任务,这些任务deploy:migrate将改变用户SUPERUSER和返回.

这是代码:

namespace :rubber do

  namespace :project do

    before "deploy:migrate", "rubber:project:add_pg_superuser_and_enable_hstore"
    after "deploy:migrate", "rubber:project:remove_pg_superuser"

    task :add_pg_superuser_and_enable_hstore,
         :roles => [:postgresql_master, :postgresql_slave] do
      alter_user_cmd = "ALTER USER #{rubber_env.db_user} SUPERUSER"
      create_hstore_cmd = "CREATE EXTENSION IF NOT EXISTS hstore;"
      rubber.sudo_script "add_superuser_create_hstore", <<-ENDSCRIPT
        sudo -i -u postgres psql -c "#{alter_user_cmd}"
        sudo -i -u postgres psql -c "#{create_hstore_cmd}"
      ENDSCRIPT
    end

    task :remove_pg_superuser, :roles => [:postgresql_master,
                                          :postgresql_slave] do
      alter_user_cmd = "ALTER USER #{rubber_env.db_user} NOSUPERUSER"
      rubber.sudo_script "add_superuser_create_hstore", <<-ENDSCRIPT
        sudo -i -u postgres psql -c "#{alter_user_cmd}"
      ENDSCRIPT
    end

  end

end