ruby - Association Issue -

i have 3 models user, club , mcq.

in club model. assign club (class) -

1. 9-physics
2. 9-chemistry
3. 10-physics
4. 10-chemistry...

here association

class user < activerecord::base   has_and_belongs_to_many :clubs end  class club < activerecord::base   has_many :mcqs   has_and_belongs_to_many :users end  class mcq < activerecord::base     belongs_to :club end 

in student view (student show index) show club (as subject) , after click on subject want show mcq topic of related subject.

for club controller -

class clubscontroller < applicationcontroller  #its show subject list def student_show_index     @club = current_user.clubs   end    #its show topic according subject.   def student_show_topic     @club = current_user.clubs     @mcq = @club.first.mcqs.order('created_at desc')   end  end 

so question is, when click on subject physics show mcq of 9th. , same chemistry.

i want filtered mcq according subject.

you have send params club_id in link of subject clicking. eg. <%=link_to "subject", x_path(club_id: n) %> can catch params in controller action params[:club_id]. rewrite controller action following

def student_show_topic   @club = club.find(params[:club_id])   @mcq = @club.mcqs.order('created_at desc') end 

not may need permit club_id params in controller, if not yet added. hope you. let me know if issues?