Rails PSQL JSON查询：在未知位置找到嵌套的数组元素？

Question

Please see an example here: http://edgeguides.rubyonrails.org/active_record_postgresql.html#json

How do I get all the records containing "jack" inside change array?

I can currently do it with such a query:

Event.where("payload #>> '{change,0}' = 'jack' ")

But what if I don't know the exact "jack" 's position (0 in this case) inside change array? How to rearrange the Rails PSQL query then?

Answer 1

看一下JSON类型内的查询数组元素 ，特别是@> （包含）运算符的讨论（如果使用的是jsonb列）。