Nested resources, simple_form_for - ruby-on-rails

Question

I am trying to create an app where I have Events and each event would have many sales. When a new sale is created it automatically gets an event ID it belongs to. Could somebody please review this and tell me if I am doing something wrong, because I think the way am creating simple_form for the nested model(Sale) is a bit incorrect. Also I am not sure if it should be this way or I ve done something wrong, but when I am accessing nested children the url looks like this
.../events/4/sales/1
.../events/3/sales/1
.../events/5/sales/1
but I would expect it to be like this ?!
.../events/4/sales/1
.../events/4/sales/2
.../events/4/sales/3
Here is my controller and model for Events
class Event < ApplicationRecord
has_many :sales, dependent: :destroy
end
.
class EventsController < ApplicationController
def index
#events = Event.all
end
def new
#event = Event.new
end
def create
#event = Event.new(event_params)
if #event.save
redirect_to #event
else
redirect_to events_path
end
end
def show
#event = Event.find(params[:id])
#sales = #event.sales
end
private
def event_params
params.require(:event).permit(:name, :comment, :event_disscount)
end
end
.
Here is my controller and model for Sales
class Sale < ApplicationRecord
belongs_to :event
has_many :sale_items
accepts_nested_attributes_for :sale_items, allow_destroy: true
end
.
class SalesController < ApplicationController
def new
#sale = Sale.new(event_id: params[:event_id])
#event = Event.find_by(id: params[:event_id])
end
def create
#event = Event.find(params[:event_id])
#sale = #event.sales.create(params[:sale].permit(:receipt_email))
if #sale.save
redirect_to #event
else
redirect_to new
end
end
end
routes.rb
Rails.application.routes.draw do
# For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
resources :events do
resources :sales
end
root 'events#index'
end
And this is how I use simple_form for sale(new)
<%= simple_form_for([#event, #sale]) do |f| %>
My main concern is the 'new' action in Sales controller, whats the best way to create a nested resource with the id of its parent, and then passing this object to the simple_form?!
Thank you in advance

Answer 1

Your question is too broad. Basically you're doing it all right, however, with some improvements on the code it will be easier to find possible problems.
is it correct the way I am creating new sale?
Some improvements over your SalesController:
Create private method sale_params which will sanitize input params from your form. You did it for events already - why not to do it here too?
Since that controller works in the scope of event, params[:event_id] is set for every action. So create a before_action filter which will set your #event variable.
Method create saves the model to the database, so calling save after it makes no sense.
In case of failure on saving #sale to the db redirecting to new is not reasonable. In that case everything user typed in the form will be lost, validation error won't be shown and it will look like a glitch of your app. Render new template instead with the same #sale.
This is how I would rewrite your controller:
class SalesController < ApplicationController
before_action: :set_event
def new
#sale = #event.sales.build
end
def create
#sale = #event.sales.build(sale_params)
if #sale.save
redirect_to #event
else
render action: :new
end
end
private
def sale_params
params.require(:sale).permit(:receipt_email, sale_items_attributes: [])
end
def set_event
#event = Event.find(params[:event_id])
end
end