activerecord - ActiveRecord find if a record contain certain ID

Question

Suppose an ActiveRecord named "Relationships". It has an attribute "participants" which is an array containing people ID. Now I want to find the records that contain a certain people ID. How should I query it?

Answer 1

也许你想做的是这样的：

    Student.where(:grade => [9,11,12])

如此处所示：

http://api.rubyonrails.org/classes/ActiveRecord/Base.html