无法在PostgreSQL中运行“创建扩展名hstore”

Question

I am trying to run db:migrate from my rails application.

migration file:

 def self.up
    enable_extension "hstore"
 end
 def self.down
    disable_extension "hstore"
 end

Error:

-- enable_extension("hstore")
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::UndefinedFile: ERROR: could not open extension control file "/usr/pgsql-9.4/share/extension/hstore.control": No such file or directory : CREATE EXTENSION IF NOT EXISTS "hstore"/gems/activerecord-4.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:592:in `async_exec'

postgres=# select version(); ==> PostgreSQL 9.4.4 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-11), 64-bit
(1 row)

After searching relating to this issue, i found out 'hstore' dependency can be solved using postgresql-contrib. I added postgresql-contrib but no use still.

yum install postgresql ==> Package postgresql-8.4.20-2.el6_6.x86_64 already installed and latest version

yum install postgresql-contrib ==> Package postgresql-contrib-8.4.20-2.el6_6.x86_64 already installed and latest version

Answer 1

您在PostgreSQL实例中一团糟-活动的PostgreSQL是9.4，安装的rpm 8.4。

Answer 2

需要安装9.4 contrib，例如yum install postgresql94-contrib而不是8.4 。