Custom route param and form_with not using the param - ruby-on-rails

Question

I'm trying to allocate an address a custom id so it's not easy to guess the record (for people who want to add and change other people's addresses). For some reason, whilst I can create a record with the correct path being created, the edit path from form_with seems to be not using the custom resource param.
routes.rb
resources :deladdresses, param: :delid
_form.html.erb
<%= form_with model: deladdress, class: "mt-4" do |f| %>
<%= render "shared/error_messages", resource: f.object %>
.. lots removed for clarity ...
<%= f.hidden_field :country, value: "Australia" %>
<%= f.hidden_field :ordernum, name: :ordernum, value: #order %>
<%= link_to order_path(#order.ordernum) do %>
<button class="btn btn-secondary">Back</button>
<% end %>
<%= f.button "Save", id: 'submit', class: "btn btn-primary" %>
<% end %>
Which is coming from in my new.html.erb and edit.html.erb:
<%= render "form", deladdress: #deladdress %>
deladdress.rb
class Deladdress < ApplicationRecord
before_save :add_del_id
belongs_to :user
has_many :orders
def add_del_id
randchars = ("a".."z").to_a.sample(8).join
time = DateTime.now.strftime("%H%M%S")
self.delid = "#{time}-#{randchars.upcase}"
end
end
deladdress_controller.rb
class DeladdressesController < ApplicationController
before_action :find_my_order
def show
# Collect the delivery address for the order
# Do we want to collect and store these per customer?
end
def new
if current_user
#savedaddresses = Deladdress.where(user: current_user)
end
#deladdress = Deladdress.new
end
def edit
#deladdress = Deladdress.where(delid: params[:delid]).first
end
def create
#deladdress = Deladdress.create(deladdress_params)
#deladdress.user = current_user
if #deladdress
#order&.update(deladdress: #deladdress)
redirect_to order_path(#order.ordernum), notice: "Address added"
else
render :new
end
end
def update
#deladdress = Deladdress.where(delid: params[:delid]).first
if #deladdress.update(deladdress_params)
#order.update(deladdress: #deladdress)
redirect_to order_path(#order.ordernum), notice: t(".updated")
else
render :edit
end
end
private
def deladdress_params
attributes = [:first_name, :last_name, :address, :apartment, :city, :state, :country, :postcode, :ordernum, :delid]
params.require(:deladdress).permit(*attributes)
end
def find_my_order
#order = find_order
end
end
When I go to the following url http://localhost:5000/deladdresses/112750-UBTYOJGK/edit, I can see the delid is there. But, when I look at the form which it is going to try and submit I have the following. The id is 5 and not 112750-UBTYOJGK.
<form class="mt-4" action="/deladdresses/5" accept-charset="UTF-8" data-remote="true" method="post">
<input type="hidden" name="_method" value="patch">
<input type="hidden" name="authenticity_token" value="XXXXXXXXXXXX">
<button name="button" type="submit" id="submit" class="btn btn-primary">Save</button>
</form>
I am obviously missing something but I really don't know what.
Thanks in advance for any help you might be able to give to have this work.

Answer 1

You can pass the url for the form to the form helper like so:
for where you call the edit form:
<%= render "form", deladdress: #deladdress, url: deladress_path(#deladress.delid) %>
for where you call the new form:
<%= render "form", deladdress: #deladdress, url: deladresses_path %>
and then in the form itself:
<%= form_with model: deladdress, url: url, class: "mt-4" do |f| %>
...