Rails Fields_for nested in form changes Put to Post - ruby-on-rails

Question

I followed the Railscast for editing multiple records at the same time in one form. linked here: http://railscasts.com/episodes/165-edit-multiple-revised
This worked great for editing multiple onboarding_steps on the same form modal. Basically we mark the completion date of each step and hit save.
But now, one of these steps has a checklist of things to collect before it can be completed, and they want to put the checklist on the same form. And once I added in the <%= f.fields_for :onboarding_checkbox, onboarding_step.onboarding_checkbox do |checkboxes_form| %> section the form broke and threw a No route matches [POST] because the form is supposed to use PUT. For some reason adding in the nested attributes makes it want to do a POST instead of PUT.
This is it working properly before the nested attributes were added:
Started PUT "/onboarding_steps/update_multiple" for ::1 at 2018-06-15 15:25:25 -0500
Processing by OnboardingStepsController#update_multiple as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"",
"onboarding_steps"=>{"531"=>{"completed_date"=>""}, "280"=>{"completed_date"=>"02/09/2018"}}}, "commit"=>"Update"}
This is what it's doing with the nested section:
Invalid or incomplete POST params
Started POST "/onboarding_steps/update_multiple" for ::1 at 2018-06-15 15:47:08 -0500
ActionController::RoutingError (No route matches [POST] "/onboarding_steps/update_multiple"):
_edit_multiple.html.erb
<%= form_for :onboarding_steps, :url => update_multiple_onboarding_steps_path, :html => {:method => :put} do |form| %>
...
<% #onboarding_steps.each do |onboarding_step| %>
<%= fields_for "onboarding_steps[]", onboarding_step do |f| %>
... this is where it breaks the form ...
<% if onboarding_step.onboarding_checkbox.present? %>
<%= f.fields_for :onboarding_checkbox, onboarding_step.onboarding_checkbox do |checkboxes_form| %>
<%= submit_tag "Update", :class=>"btn btn-small btn-primary" %>
onboarding_steps_controller.rb
def edit_multiple
onboarding_step = OnboardingStep.find(params[:onboarding_step_id])
#onboarding_steps = OnboardingStep.includes(:onboarding_step_type).find(onboarding_step.group_steps.ids)
end
def update_multiple
logger.debug params
params.permit!
#onboarding_steps = OnboardingStep.update(params[:onboarding_steps].keys, params[:onboarding_steps].values)
#onboarding_steps.reject! { |s| s.errors.empty? }
if #onboarding_steps.empty?
redirect_to :back, notice: 'Update Successful'
else
render "edit_multiple"
end
end
which at the bottom does include onboarding_checkbox_attributes:[]
onboarding_step.rb has accepts_nested_attributes_for :onboarding_checkbox
routes.rb
resources :onboarding_steps do
resources :onboarding_checkboxes
member do
get "delete"
end
collection do
get :edit_multiple
put :update_multiple
end
end
Not sure where it's going wrong. It's Friday and my brain is fried

Answer 1

Had this same issue. Got around it by using each_with_index and assign an index to the record set:
In other words, instead of doing this:
<% #onboarding_steps.each do |onboarding_step| %>
<%= fields_for "onboarding_steps[]", onboarding_step do |f| %>
do this:
<% #onboarding_steps.each_with_index do |onboarding_step, index| %>
<%= fields_for "onboarding_steps[#{index}]", onboarding_step do |f| %>

Answer 2

Do not forget to include id in onboarding_checkbox_attributes:[]