How to make an unusual association in simple_form (rails)?

Question

Ruby on Rails

Good afternoon.
There is a form for creating a trouble ticket:

<%= simple_form_for @request,  html: {class: 'form-horizontal' } do |f| %>
  <%= f.input :initiator, label: 'Инициатор'  %>
  <%= f.association :department, collection: Department.all, value_method: :id, label: 'Назначить на отдел' %>
  <%= f.association :user, collection: User.all, label_method: :email, label: 'Ответственный' %>
  <%= f.input :comment, label: 'Комментарий' %>
  <%= f.input :sla, label: 'SLA' %>
  <%= f.button :submit, label: 'Создать', class: "btn btn-primary" %>
<% end %>

How can I make it so that when selecting a department ( <%= f.association :department...) the users from the second dropdown menu are only from that department, not User.all. What parameters to give the rails? By what means is this resolved?

Answer 1

Check out the Dynamic Select Menus screencast from railscasts.com , which does exactly what you need.
There is a newer version of the screencast, but a subscription is required. I have a new version, only xs where to upload it and whether it is necessary to download it on rutracker.

Answer 2

This can only be done with javascript, one of the options is to hang a handler on the first select on the 'change' event, which makes an AJAX request to the server, receives the necessary users and fills in the second select. Google ajax master-detail select boxes

Answer 3

This is done via Ajax, when the user has selected a department, users from the selected department are loaded.