How to search through nested values of attributes in rails

问题

Hi I have a sample app which has 3 objects in seed file:

students =[{
  name: "John",
  hobby: "sport"},
{
  name: "Bill",
  hobby: "science"},
{
  name: "Evit Tom",
  hobby: ["sport","science"]}]

students.each do |student|
  School.create(student)
end

I search them with check boxes form:

<%= form_tag student_list_path %>
  Hobby:
  <ul>
    <li><%= check_box_tag 'hobby[]', "Sport" %> Sport</li> 
    <li><%= check_box_tag 'hobby[]', "Science" %> Science</li>     
  </ul>            
<%= submit_tag "Show" %>

And in controller I have:

@hobby = params[:hobby]
@schools = Student.student_search(@hobby).to_a

And in my Student model:

     def self.student_search(hobby)
       School.where(hobby: hobby)
     end

My trouble is to get the Evil Tom object. I know that this is becouse of the array value of this object hobby attribute. But I don`t know how to get to it.

I tried to make a 'search_array' method in my Studen model.

   def array_search(array)
     temp = []
     array.each do |value|
       case value
       when Array
         array_search(value)
       else
         temp << value
       end
       temp
     end
   end

And use it in a search action like this:

     def self.student_search(hobby)
       hobby_s = array_search(hobby)
       School.where(hobby: hobby_s)
     end

But I get undefinded method, I don`t know why since it is defined in Student class.

My main problem is how to get the 'Evil Tom' object if you have any ideas pleas post :) I will get code by my self. I need just the hint.

来源：https://stackoverflow.com/questions/31635016/how-to-search-through-nested-values-of-attributes-in-rails