edit.html.erb

<%= form_for @user, url: admin_user_path(@user), method: :put do |f| %>
  <%= f.label :name %>
  <%= f.text_field :name %>
  <%= f.label :pincode, "Pin" %>
  <%= f.text_field :pincode %>
  <%= f.submit %>
<% end %>

<% unless @user == current_user %>
  <% if @user.admin? %>
    <%= button_to "Demote", admin_demote_user_path(@user), method: :post %>
  <% else %>
    <%= button_to "Promote", admin_promote_user_path(@user), method: :post %>
  <% end %>
<% end %>