Rails 4.1 nested model form fields

Question

Booking -< Orders -< Transactions

class Booking < ActiveRecord::Base
  has_many :orders
end

class Order < ActiveRecord::Base
  belongs_to :booking
  has_many :transactions
end

class Transaction < ActiveRecord::Base
  belongs_to :order
end

I need to be able to create a Transaction without an Order or Booking existing.

I'm trying to achieve the following: When a Transaction is created an Order and a Booking is automatically created. The transaction form can take a Booking.booking_number which will be saved to the above automatically created Booking.

I'm very new to rails and have tried a combination of accepts_nested_attributes_for, Ryan Bates' nested model form part1 screencast and form_fields_for without success.

Some guidance, not necessarily code, would be much appreciated.

My routes look like:

Answer 1

I need to be able to create a Transaction without an Order or Booking existing.

Bad system design - surely a transaction would follow an order or booking?

From your question, I'd highly recommend creating a booking or order first. This will allow you to create a transaction as a bolt-on to the order or booking:

#app/controllers/bookings_controller.rb
Class BookingsController < ApplicationController
   def create
       booking = Booking.new(booking_params)
       booking.save
   end
end

#app/models/booking.rb
Class Booking < ActiveRecord::Base
    before_create :build_transaction #-> creates a blank transaction which can be populated later
end

---

Nonetheless, there's nothing stopping you creating a transaction & assigning an order later

You can do this:

#app/controllers/transactions_controller.rb
def create
    Transaction.new(transaction_params)
end

#app/models/transaction.rb
Class Transaction < ActiveRecord::Base
    after_create :order

    def order
        self.order.create!([order_details?])
    end
end

---

If you tell me some more about what you're building, I'll be able to create a more refined response!

Answer 2

Try this it may be work. In your model accepts_nested_attributes_for :order, :allow_destroy => true change whether true/false depending on your form