ruby 续集访问 json 字段

Question

我有以下架构：

 Column  |            Type             |       Modifiers        
---------+-----------------------------+------------------------
 id      | text                        | not null
 data    | json                        | not null
 created | timestamp without time zone | not null default now()

如果我打开 psql，我可以运行查询。

select id, data->'amount' as amount from plans;

但是 ruby​​ sequel gem 毁了它。

puts $db.run("select id, data->'amount' as amount from plans")

怎么了？

Answer 1

需要#literal 方法。

$db.run("select id, data -> #{ $db.literal('amount') } as amount from plans")