Rails nested_form inside nested_form

Question

I have the following models and relations:

Rate fields
  t.string :type
  t.string :name

class Rate < ActiveRecord::Base
  has_many :category_rate_requests
end

CategoryRateRequests fields
  t.date :date_from
  t.date :date_to

class CategoryRateRequests < ActiveRecord::Base
  belongs_to :rate
  has_many :category_rates
end

CategoryRate 
  t.integer :room_category_id
  t.integer :new_rate_id
  t.integer :category_rate_request_id
  t.integer :amount

class CategoryRate < ActiveRecord::Base
  belongs_to :rate
  belongs_to :category_rate_request
  belongs_to :room_category
end

And I'm trying to have a nested_form inside a nested_form

= nested_form_for @rate do |f|
  = label_tag :name, t('rates.new.name'), class: 'grey h2'
  = f.text_field(:name, required: true, class: 'form-input form-control full-width-input')
  = f.fields_for :category_rate_request do |request|
    = request.text_field(:date_from,  class: 'date-input form-control start-date-input', type: 'text', 'data-provide': 'datepicker', placeholder: t('common.date_from'))
    = request.text_field(:date_to, class: 'date-input form-control end-date-input', type: 'text', 'data-provide': 'datepicker', placeholder: t('common.date_to'))
    = request.fields_for :category_rate, do |u|
      = u.number_field(:price, class: "form-control", placeholder:  placeholder)

Overall this is the format. It has more things, but to not include too much unnecesary information I omitted some fields of the form.

But I get the following error

Completed 500 Internal Server Error in 690ms (ActiveRecord: 6.1ms)

SyntaxError - syntax error, unexpected keyword_do_block ; _slim_controls2 = request.fields_for :new_category_rate, do |u|; ^ /project/app/views/new_rates/_category_rate_requests.html.slim:61: syntax error, unexpected keyword_ensure, expecting end-of-input:

That line marked in red is:

= request.fields_for :new_category_rate, do |u|

Is there any way I can have the attributes of all three models in one form? In the Rate form more precisely.

Answer 1

(copied from comment)

You have an extra comma in the erroring line. Change it to:

= request.fields_for :new_category_rate do |u|