In my view I have on combo in  that i load all subjects from
SubjectMaster table by that i got id and name of selected subject..
so I take two hidden fields name and code.
After this i want to store the name and code of that selected subject
in my subject table


 <% form_remote_for @subject do |f| %>

    <div>  <label for="student_course">Select a Subject: </label></
div>
   <div class="text-input-bg"><%=
f.select :subject_master_id ,@subjects.map {|b| [b.name, b.id] } ,
        {:prompt => 'Select Subject'} %>
    <%= f.hidden_field :name, :value => @subjects.name %>
    <%= f.hidden_field :code, :value => @subjects.code %>

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