Submitting two forms in Rails sharing a same param - ruby-on-rails

Question

I have a form like that:
<%= form_for #report do |f| %>
<div class="row">
<div class="col-sm-9">
<h3 class="page-header">
Children
</h3>
<div class="row">
<% students.each do |student| %>
<div class="col-xs-4 col-md-2">
<div class="std_container">
<%= check_box_tag "student_ids[]", student.id, nil, {id: "check_#{student.id}", class: "student_check"} %>
<%= label_tag "check_#{student.id}" do %>
<div class="std_label"><%= student.name %></div>
<div class="std_img thumbnail"><img src="http://www.codeproject.com/KB/GDI-plus/ImageProcessing2/img.jpg" alt=""></div>
<% end %>
</div>
</div>
<% end %>
</div>
</div>
<%= render "form_categories", f: f, report_notes: #report.report_notes %>
<%= render "messages/form", ????? %>
</div>
</div>
</div>
<% end %>
And I need to render these two partials on the bottom. The 'messages' partial is a form that responds to a different controller but needs to use the "student_ids[]" parameter present on the #report form together with its own parameters. This partial is:
<%= form_for #message do |f| %>
<div class="row">
<div class="col-sm-10 col-sm-offset-1">
<%= f.hidden_field :professor_id, :value => current_user.professor.id %>
<%= f.label :text, "Texto" %>
<%= f.text_area :text %>
<%= f.submit "Enviar", class: "btn btn-default" %>
</div>
</div>
<% end %>
How do build this "messages" partial in a way that I can use the "student_ids[]" and submit it to its controller?

Answer 1

It is not possible. I solved this problem by using javascript.