我正在尝试将 hstore 数据列添加到现有的 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