ruby-on-rails - Rails 3.1、Postgres 9.1.4、hstore 未知运算符错误

Question

我正在尝试将 hstore 数据列添加到现有 STI 模型。

类似于Postgres HStore Errors - Unknown Operator但据我所知，我已经安装了 hstore 扩展。我已经删除了数据库并从迁移中重建它而没有错误，但规范仍然失败。

Mac OS X 10.8.2
Rails 3.1.10
psql (PostgreSQL) 9.1.4

用户.rb

has_many :targets

def complete_targets
  targets.where("data @> (:key => :value)", key: 'complete', value: 'true')
end

目标.rb

belongs_to :user
serialize :data, ActiveRecord::Coders::Hstore

setup_hstore 迁移:

class SetupHstore < ActiveRecord::Migration
  def self.up
    execute "CREATE EXTENSION IF NOT EXISTS hstore"
  end

  def self.down
    execute "DROP EXTENSION IF EXISTS hstore"
  end
end

添加数据列迁移:

class AddDataToRecords < ActiveRecord::Migration
  def change
    add_column :records, :data, :hstore
  end
end

添加索引迁移:

class AddHstoreIndexes < ActiveRecord::Migration
  def up
    execute "CREATE INDEX records_gin_data ON records USING GIN(data)"
  end

  def down
    execute "DROP INDEX records_gin_data"
  end
end

错误:

ActiveRecord::StatementInvalid:
PG::Error: ERROR:  operator does not exist: unknown => unknown
LINE 1: ...records"."user_id" = 244 AND (data @> ('complete' => 'true')...

尝试通过直接查询创建扩展时的 Navicat 输出:

CREATE EXTENSION hstore Error : ERROR:  extension "hstore" already exists

Answer 1

也许你的情况是一个简单的数据类型问题，试试:

data @> ('complete'::text => 'true'::text)

但是 => 运算符已被弃用(并已在 9.2 中删除)，最好使用 hstore() 格式:

(data @> hstore('complete','true'))