<%= form_tag({action: 'update', id: @article.id}, method: :post, multipart: true, id: "article_form", class: 'autosave') do %>
  <%= render 'form' %>
<% end %>
<%= form_tag({action: 'update', id: @article.id}, method: :put, multipart: true, id: "article_form", class: 'autosave') do %>
  <%= render 'form' %>
<% end %>

Use put method for content update
Use put method for content update
