[Rails] View and Controllers association

in views file.

<%= render 'row', :object => @row_1 %>

_row_html.erb

<% row.each do |i| %>
<%- if i.nil? -%>
<%= render 'users/signup' %>
<%- elsif i.respond_to?('category_id') -%>
<%# render partial_for_post(i.category_id), :object => i %>
<%= i.module %>
<%- end -%>
<% end %>

if I write i.class it returns Post, so I thought module will be a
method in post_controller.rb. But it's not, can any one tell me, what is
it, and where can I get codes written for i.module.

Thanks
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