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# Stock allocator

This article explains the concept of a stock allocator and its usage.

During the checkout process, after the delivery step, the order stocks the ordered stock items
to ship them.

The stock allocator defines the logic with which these packages are created.

The allocator is called by `Spree::Stock::SimpleCoordinator` when allocating inventory for an order.

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class AddTagsToPosts < ActiveRecord::Migration
  def migrate
    add_column :posts, :tags, :text
  end
end

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#include<stdio.h>

int main() {
  int numbers[2];

  printf("Inserisci il primo numero: ");
  scanf("%d", &numbers[0]);

  printf("Inserisci il secondo numero: ");
  scanf("%d", &numbers[1]);

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class House
  has_many :photos
end

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RSpec.describe Photo
  let(:house) { House.create! }
  subject { described_class.new(house: house) }

  it 'is marked as cover when saved' do
    expect {
      subject.save!
      subject.reload
    }.to change(subject, :cover).to(true)
  end

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class Review < ActiveRecord::Base
  belongs_to :book
  
  trigger.after(:insert) do
    <<-SQL
      UPDATE books SET reviews_count = reviews_count + 1 WHERE id = NEW.book_id;
    SQL
  end

  trigger.after(:update).of(:book_id) do

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RSpec.describe Review do
  let(:book) { Book.create! }
  subject { Review.new(book: book) }

  it "increments the book's reviews_count when saving" do
    expect {
      subject.save!
    }.to change(book, :reviews_count).by(1)
  end

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class BooksController < ApplicationController
  def top_ten
    @books = Book.order('reviews_count DESC').limit(10)
  end
end

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class Book < ActiveRecord::Base
  has_many :reviews
end

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<?php
$period = isset($_POST['period']) ? trim($_POST['period']) : '';

echo <<<EOF
<form method="post" action="{$_SERVER['REQUEST_URI']}">
  <div>
    <label for="period">Periodo:</label>
    <input type="text" name="period" id="period" value="{$period}">
  </div>