Rails 4, how to update a model field from a different controller? - ruby-on-rails

Question

I am trying to update an invoice fields, when checking out in the carts controller. These must be present when checking out, or it should fail. However, I can't get it to update, much less validate them.
Here is my code:
cart show view:
<div class = "row">
<div class = "col-lg-3 col-lg-offset-6 text-left">
<strong>Customer: </strong>
<%= collection_select(:invoice, :customer_id, #customers, :id, :full_name, {:prompt => 'Please Select'}, class: 'form-control') %>
</div>
<div class = "col-lg-3 ext-left">
<strong>Seller: </strong>
<%= collection_select(:invoice, :employee_id, #employees, :id, :full_name, {:prompt => 'Please Select'}, class: 'form-control') %>
</div>
<div class = "col-lg-12 text-right">
<%= form_tag carts_checkout_path, method: :post do |f| %>
<%= submit_tag 'Complete', class: 'btn btn-success' %>
<% end %>
</div>
</div>
carts controller:
class CartsController < ApplicationController
def show
#invoice = current_invoice
#invoice_products = current_invoice.invoice_products
#customers = Customer.all
#employees = Employee.all
end
def checkout
current_invoice.customer_id = params[:customer_id]
current_invoice.employee_id = params[:employee_id]
current_invoice.save
redirect_to current_invoice
end
end
current_invoice is the current session's invoice, related to the cart. It redirects correctly, but doesn't update.
in the invoices controller:
def invoice_params
params.require(:invoice).permit(:invoice_number, :customer_id, :invoice_date, :invoice_status_id, :employee_id, invoice_products_attributes: [:id, :invoice_id, :product_id, :price, :tax, :discount, :value])
end
Can anyone please help me in identifying where I am going wrong? Could it be my approach is not even valid?
Thanks in advance

Answer 1

The type of functionality you're after is considered "business logic" and should be implemented in the model and called from the controller.
You can define a method in a model:
class Invoice < ActiveRecord::Base
def update_invoice(cust_id, emp_id)
if self.update_attributes(:customer_id => cust_id], :employee_id = emp_id])
puts "Success!
else
puts "Failed to update record. Handle the error."
end
end
You can call my_method from carts_controller.rb like this:
def update
# all your regular update logic here
# replace the bit of code that saves the cart with something like this:
respond_to do |format|
if(current_invoice.update_invoice(params[:customer_id], params[:employee_id])
if(#cart.update(cart_params))
format.html { redirect_to #activity, notice: 'Activity was successfully updated.' }
format.json { render :show, status: :ok, location: #activity }
else
format.html { render :edit }
format.json { render json: #activity.errors, status: :unprocessable_entity }
end
end
end
Also, note the use of update_attributes rather than save. Bear in mind that update_attributes will return false if you run into any problems updating (e.g. one or more validations failed). Don't confuse update_attributes with the singular update_attribute which updates a single field and will not run validations.

Answer 2

Finally got it.
current_invoice.update_attributes(customer_id: params[:invoice][:customer_id], employee_id: params[:invoice][:employee_id])
Also in view, changed location of form_tag:
<div class = "row">
<%= form_tag carts_checkout_path, method: :post do |f| %>
<div class = "col-lg-3 col-lg-offset-6 text-left">
<strong>Cliente: </strong>
<%= collection_select(:invoice, :customer_id, #customers, :id, :full_name, {:prompt => 'Favor Seleccionar'}, class: 'form-control') %>
</div>
<div class = "col-lg-3 ext-left">
<strong>Vendedor: </strong>
<%= collection_select(:invoice, :employee_id, #employees, :id, :full_name, {:prompt => 'Favor Seleccionar'}, class: 'form-control') %>
</div>
<div class = "col-lg-12 text-right">
<%= submit_tag 'Completar', class: 'btn btn-success' %>
</div>
<% end %>
</div>

Answer 3

Could it be my approach is not even valid
Your approach is definitely valid, it's great that you're using sessions in this way.
I'd do it slightly differently:
#config/routes.rb
resource :cart, except: [:edit, :new, :create], path_names: { update: "checkout" }
This will give you the following paths:
#url.com/cart -> carts#show (here you can invoke a cart if one doesn't exist)
#url.com/cart/checkout #-> POST to "update" method in carts controller
#url.com/cart/ (method: :delete) -> DELETE to "destroy" cart (refresh)
--
#app/controllers/carts_controller.rb
class CartsController < ApplicationController
before_action :setup_cart
def show
#cart = current_cart #-> products called from this. I don't know how you're linking them
#customers = Customer.all
#employees = Employee.all
end
def update
#invoice = Invoice.find_or_create_by(id: current_card.id)
#invoice.update update_params
redirect_to cart_path
end
def destroy
current_cart = nil
redirect_to carts_path, notice: "Cart Cleared"
end
private
def setup_cart
current_cart ||= sessions[:cart]
end
def update_params
params.require(:cart).permit(:customer_id, :employee_id)
end
end
Now, to update the cart, you'll want to take note from MarsAtomic's answer. However it must be noted that naked params are not available in the model.
If you use update_attributes, or just plain update, you'll need to do the following:
#app/models/cart.rb
class Invoice < ActiveRecord::Base
has_many :products
belongs_to :employee
belongs_to :customer
#validations here
#callbacks here (what MarsAtomic refers to as business logic)
before_save :do_something, only: :update
private
def do_something
#something here
#params appended to current instance of object
#eg self.customer_id
end
end
I'd also go more succinct in your view:
#app/views/carts/show.html.erb
<div class = "row">
<%= form_tag cart_checkout_path, method: :patch do |f| %>
<% options = [["cliente", "customer"], ["vendedor", "employee"]] %>
<% options.each do |name, type| %>
<%= content_tag :strong, "#{name.titleize}:" %>
<%= collection_select :cart, eval(":#{type}_id"), instance_variable_get("##{type.pluralize}"), :id, :full_name, {:prompt => 'Favor Seleccionar'}, class: 'form-control') %>
<% end %>
<% content_tag :div, class: "col-lg-12 text-right" do %>
<%= submit_tag 'Completar', class: 'btn btn-success' %>
<% end %>
<% end %>
</div>