1

我在代码中创建了一个具有以下架构的表

DB.create_table :Pokemon do
  primary_key :id
  String :first_name
  String :last_name
  String :email
  String :zipcode
  String :company_name
  String :google_profile
  String :skype
  String :phone
  String :about
  String :linkedin_profile_url
  String :company_url
  column :needs , 'Text[]'
  column :offering , 'Text[]'
end

为了需要和提供我正在插入一个带有以下代码的字符串数组

pokes=DB[:Pokemon];
off=['hello1' , 'hello2']
nee= ['need1' , 'need2']
pokes.insert(:first_name => 'abcd' ,:last_name => 'mehandiratta', :offering => off , :needs =>  nee)

当我运行它时出现错误

PG::Error: ERROR:  column "offering" is of type text[] but expression is of type record (Sequel::DatabaseError)
LINE 1: ...fering", "needs") VALUES ('abcd', 'mehandiratta', ('hello1',...
                                                             ^
HINT:  You will need to rewrite or cast the expression.
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/postgres.rb:145:in `execute_query'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/database/logging.rb:33:in `log_yield'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/postgres.rb:145:in `execute_query'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/postgres.rb:132:in `execute'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/postgres.rb:111:in `check_disconnect_errors'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/postgres.rb:132:in `execute'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/postgres.rb:413:in `_execute'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/postgres.rb:242:in `execute'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/postgres.rb:425:in `check_database_errors'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/postgres.rb:242:in `execute'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/database/connecting.rb:236:in `synchronize'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/connection_pool/threaded.rb:104:in `hold'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/database/connecting.rb:236:in `synchronize'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/postgres.rb:242:in `execute'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/dataset/actions.rb:801:in `execute'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/postgres.rb:525:in `fetch_rows'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/dataset/actions.rb:860:in `returning_fetch_rows'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/dataset/actions.rb:341:in `insert'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/shared/postgres.rb:1060:in `insert'
    from /var/lib/gems/1.8/gems/sequel-3.43.0/lib/sequel/adapters/shared/postgres.rb:1069:in `insert'
    from hello.rb:10

谁能告诉一个合适的方法如何在 Sequel gem 中插入数组以及如何在列中添加文本数组

4

3 回答 3

5

您需要使用 Sequel 的 pg_array 扩展，参见http://sequel.rubyforge.org/rdoc-plugins/files/lib/sequel/extensions/pg_array_rb.html

于 2013-01-31T16:53:43.773 回答
0

在您的数据库配置中：

DB.extension :pg_array

然后只需将每个数组转换为 PGArray 类型：

pokes.insert(:first_name => 'abcd' ,:last_name => 'mehandiratta', :offering => Sequel.pg_array(off) , :needs => Sequel.pg_array(nee))

core-extensions@Jeremy Evans 的回答提供了指向文档的链接，其中包括使用扩展的更简洁的方法。

于 2018-08-09T22:02:51.277 回答
-1

正如错误所说，只需将 Array 表达式转换为字符串，如下所示：

pokes.insert(:first_name => 'abcd' ,:last_name => 'mehandiratta', :offering => off.to_s , :needs =>  nee.to_s)
于 2013-01-31T16:11:40.127 回答