Double nested form not sending attributes to controller - ruby-on-rails

Question

All help/hints/debugging tips/thoughts are welcome, as I'm pretty much stuck for some time on this issue.
I have a 2-level deep nested form. The parameters of the 1st level are saving correctly (e.g. options_attributes), but unfortunately the parameters of the deepest form are not being sent to the controller (.e.g. option_prices_attributes is not shown at all in my parameters. I use the cocoon gem to create a dynamic nester form.
Interestingly,
(1) in my console I am able to create a 2-level deep object where also the option_price parameters are saving.
(2) when using :option_prices_attributes in the simple_field forms, they are being sent as parameters:
{"utf8"=>"✓", "_method"=>"patch", "authenticity_token"=>"P6oCZkZF8O+, "accommodation_category"=>{"options_attributes"=>{"1568305809712"=>{"name"=>"Option name", "_destroy"=>"false", "option_prices_attributes"=>{"name"=>"Option price", "_destroy"=>"0"}}}}, "commit"=>"Save", "park_id"=>"8", "id"=>"96"}
=> and consequently resulting in an error message in the terminal saying
no implicit conversion of Symbol into Integer
My models
class AccommodationCategory < ApplicationRecord
belongs_to :park
has_many :options, dependent: :destroy
accepts_nested_attributes_for :options, allow_destroy: true
end
class Option < ApplicationRecord
belongs_to :accommodation_category
has_many :option_prices, dependent: :destroy
accepts_nested_attributes_for :option_prices, allow_destroy: true
end
class OptionPrice < ApplicationRecord
belongs_to :option
end
Accommodation_categories_controller.rb
class AccommodationCategoriesController < ApplicationController
# skip_before_action :authenticate_user!
[...]
def update
#park = Park.find(params[:park_id])
#accommodation_category = #park.accommodation_categories.find(params[:id])
authorize #accommodation_category
#accommodation_category = #accommodation_category.update_attributes(accommodation_category_params)
end
def new_options
#accommodation_category = AccommodationCategory.find(params[:id])
#park = #accommodation_category.park
authorize #accommodation_category
#2nd level nesting
# #accommodation_category.options.build
#accommodation_category.options.each do |option|
option.option_prices.build
end
end
private
def accommodation_category_params
params.require(:accommodation_category).permit(:name, :description, :status, :persons_max, :persons_min, :persons_included, :accommodation_count, :enabled_accommodation_count, :thumb, :included_services, :photo,
options_attributes: [:name, :description, :_destroy,
option_prices_attributes: [:name, :price_type, :start_date, :end_date, :price, :duration, :duration_min, :duration_max, :backend_only, :weekend_extra, :_destroy]])
end
end
views/accommodation_categories/new_options.html.erb
<%= render 'options_new_form', park: #park%>
views/accommodation_categories/options_new_form.html.erb (1st level)
<%= simple_form_for [#park, #accommodation_category] do |f|%>
<h1> <%= #accommodation_category.name %> </h1>
<% #accommodation_category.options.each do |option| %>
<%= option %>
<% end %>
<%= f.simple_fields_for :options do |option| %>
<%= render 'option_fields', f: option %>
<% end %>
<div>
<%= link_to_add_association 'add option', f, :options %>
</div>
<%= f.submit "Save", class: "btn btn-primary" %>
<% end %>
views/accommodation_categories/option_fields.html.erb (2nd level)
<%= f.input :name %>
<%= f.check_box :_destroy %>
<%= link_to_remove_association "remove option", f %>
<%= f.simple_fields_for :option_prices do |option_price| %>
<%= render 'option_price_fields', f: option_price %>
<% end %>
<%= link_to_add_association 'add option price', f, :option_prices %>
views/accommodation_categories/option_price_fields.html.erb
<%= f.input :name %>
<%= f.check_box :_destroy %>
<%= link_to_remove_association "remove option price", f %>
The message in my terminal when sending the parameter to the controller is the following:
Processing by AccommodationCategoriesController#update as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"QlROXu9ImP6GSvPJQgd7eVZtaWsiVT6myWzZEFIEtEulSrQmt75XVMEI/avKUzhjZaZG9Kj0Pmih6J/4UYO8IQ==", "accommodation_category"=>{"options_attributes"=>{"1568290804865"=>{"name"=>"option name", "_destroy"=>"false"}}}, "commit"=>"Save", "park_id"=>"8", "id"=>"93"}
User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2 [["id", 1], ["LIMIT", 1]]
↳ /Users/xx/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activerecord-5.2.3/lib/active_record/log_subscriber.rb:98
Park Load (0.4ms) SELECT "parks".* FROM "parks" WHERE "parks"."id" = $1 LIMIT $2 [["id", 8], ["LIMIT", 1]]
↳ app/controllers/accommodation_categories_controller.rb:29
AccommodationCategory Load (0.2ms) SELECT "accommodation_categories".* FROM "accommodation_categories" WHERE "accommodation_categories"."park_id" = $1 AND "accommodation_categories"."id" = $2 LIMIT $3 [["park_id", 8], ["id", 93], ["LIMIT", 1]]
↳ app/controllers/accommodation_categories_controller.rb:30
(0.2ms) BEGIN
↳ app/controllers/accommodation_categories_controller.rb:32
Option Create (0.3ms) INSERT INTO "options" ("accommodation_category_id", "name", "created_at", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id" [["accommodation_category_id", 93], ["name", "option name"], ["created_at", "2019-09-12 12:20:14.265335"], ["updated_at", "2019-09-12 12:20:14.265335"]]
↳ app/controllers/accommodation_categories_controller.rb:32
(0.7ms) COMMIT
↳ app/controllers/accommodation_categories_controller.rb:32
AccommodationCategory Load (0.2ms) SELECT "accommodation_categories".* FROM "accommodation_categories" WHERE "accommodation_categories"."park_id" = $1 AND "accommodation_categories"."id" = $2 LIMIT $3 [["park_id", 8], ["id", 93], ["LIMIT", 1]]
↳ app/controllers/accommodation_categories_controller.rb:45
Redirected to http://localhost:3000/accommodation_categories/93/new_discounts
Completed 302 Found in 14ms (ActiveRecord: 2.3ms)

Answer 1

None of your nested-fields partials seem to have a wrapper-class? Cocoon explicitly relies on a specific mark-up, this could cause e.g. the nested fields to appear to be inserted correctly, but inserted outside of the form and then of course never posted to the server/controller.