带有嵌套对象的 Rails 6 复杂表单 collection_select 不起作用

Question

Would be super grateful if anyone had any insights into what I should be doing that I'm not already doing.

db/schema.rb

  create_table "users", force: :cascade do |t|
    t.string "first_name"
    t.string "last_name"
    t.string "email"
    t.string "password_digest"
    t.bigint "cell_number"
    t.boolean "sms_daily"
    t.string "initials"
    t.string "remember_token"
    t.boolean "admin", default: false
    t.boolean "vacation_mode", default: false
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.string "remember_digest"
    t.index ["email"], name: "index_users_on_email", unique: true
    t.index ["remember_token"], name: "index_users_on_remember_token"
  end

  create_table "schedules", force: :cascade do |t|
    t.text "comments"
    t.integer "author_id", null: false
    t.boolean "draft", default: true
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.index ["author_id"], name: "index_schedules_on_author_id"
  end

  create_table "rooms", force: :cascade do |t|
    t.integer "schedule_id", null: false
    t.integer "order"
    t.string "site"
    t.string "note"
    t.string "name"
    t.integer "start_hour"
    t.integer "start_minute"
    t.string "user_initials"
    t.boolean "block"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.index ["schedule_id"], name: "index_rooms_on_schedule_id"
  end

app/model/schedule.rb

class Schedule < ApplicationRecord
  belongs_to :author, class_name: "User"
  has_many :rooms
  accepts_nested_attributes_for :rooms
  ...
end

app/model/room.rb

class Room < ApplicationRecord
  belongs_to :schedule
  ...
end

app/views/schedule/new.hthl.erb

<% provide(:title, 'Create Schedule') %>
<h1>Create Schedule</h1>
<div class="row">
  <aside class="span4">
    <section>
      <%= form_with(model: @schedule, local: true) do |f| %>

        <div class="field">

          <%= f.fields_for :rooms, html: {class: 'form-inline' } do |r| %>

            <div class="room-title" id="<%="#{r.object[:site]}-#{r.object[:name].delete(' ')}" unless r.object[:name] == nil %>">
              <%= "#{r.object[:site]} #{r.object[:name]}"%>
              <%= r.hidden_field :site, value: r.object[:site] %>
              <%= r.hidden_field :name, value: r.object[:name] %>
              <% unless (r.object[:name] == "CHARGE" || r.object[:name] == "CO-CHARGE" || r.object[:site] == "ON_CALL" || r.object[:site] == "On-Call TODAY (Sunday or Holiday)") %>
                <br/>
                <%= r.label :start_hour %>
                <%= r.number_field :start_hour, in: 0..24, step: 1 %>
                <br/>
                <%= r.label :start_minute %>
                <%= r.number_field :start_minute, in: 0..60, step: 1 %>
              <% end %>
              <%= r.collection_select(:user_initials,User.all.map(&:initials).sort.unshift("-- late start").collect,:initials,:initials, include_blank: true) %>
            </div>
          <% end %>
          <%= f.submit "Save Schedule and Review", class: "btn btn-large btn-primary",  input_html: { :tabindex => autotab  } %>
        </div>  
      <% end %>
     </section>
  </aside>
</div>

I'd like for the form to present a choice of all the User's initials to be assigned to the room's user_initials, also offer the choice of not designating anyone's initials with "-- late start" as well as leaving the initials blank for an empty room.

When I deploy my code to heroku the schedule/new page generates a "We're sorry, something went wrong" error and the logs say:

 ActionView::Template::Error (undefined method `initials' for "-- late start":String):

I got this all working in Rails 4 using simple_form but heroku will no longer support the stack that I deployed the site to starting in November, 2020, and heroku's new stack's won't use the old ruby version from the original site. I'm rewriting the code in Rails 6 which simple_form doesn't work for.

Thanks in advance for your consideration!

Answer 1

collection_select works on a collection of objects and will look for the initials method on each object.

when you do this...

<%= r.collection_select(:user_initials,User.all.map(&:initials).sort.unshift("-- late start").collect,:initials,:initials, include_blank: true) %>

You're just creating an array of strings, and you're prepending another string to the array, and the strings don't have an initials method.

Better might be just to use select

<%= r.select(:user_initials, options_for_select(User.all.pluck(:initials).sort.unshift("-- late start"), r.object.user_initials), include_blank: true) %>

You can use collection_select , it must be ALL user objects, so you could temporarily create a user with initials '--late start', something like...

<%= r.collection_select(:user_initials, User.order(:initials).to_a.prepend(User.new(initials: "-- late start")), :initials, :initials, include_blank: true) %>