2. The TaxableInterface

Danger

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In order to calculate the taxes for a model in your application, it needs to implement the TaxableInterface It is a very simple interface, with only one method - the getTaxCategory(), as every taxable has to belong to a specific tax category.

2.1. Implementing the interface

Let’s assume that you have a Server entity in your application. Every server has it’s price and other parameters, but you would like to calculate the tax included in price. You could calculate the math in a simple method, but it’s not enough when you have to handle multiple tax rates, categories and zones.

First step is to implement the simple interface.

namespace AcmeBundle\Entity;

use Sylius\Component\Taxation\Model\TaxCategoryInterface;
use Sylius\Component\Taxation\Model\TaxableInterface;

class Server implements TaxableInterface
{
    private $name;
    private $taxCategory;

    public function getName()
    {
        return $this->name;
    }

    public function setName($name)
    {
        $this->name = $name;
    }

    public function getTaxCategory()
    {
        return $this->taxCategory;
    }

    public function setTaxCategory(TaxCategoryInterface $taxCategory) // This method is not required.
    {
        $this->taxCategory = $taxCategory;
    }
}

Second and last task is to define the relation inside Resources/config/doctrine/Server.orm.xml of your bundle.

<?xml version="1.0" encoding="UTF-8"?>

<doctrine-mapping xmlns="https://doctrine-project.org/schemas/orm/doctrine-mapping"
                  xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
                  xsi:schemaLocation="https://doctrine-project.org/schemas/orm/doctrine-mapping
                                      https://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">

    <entity name="AcmeBundle\Entity\Server" table="acme_server">
        <!-- your mappings... -->

        <many-to-one field="taxCategory" target-entity="Sylius\Component\Taxation\Model\TaxCategoryInterface">
            <join-column name="tax_category_id" referenced-column-name="id" nullable="false" />
        </many-to-one>
    </entity>

</doctrine-mapping>

Done! Now your Server model can be used in Sylius taxation engine.

2.2. Forms

If you want to add a tax category selection field to your model form, simply use the sylius_tax_category_choice type.

namespace AcmeBundle\Form\Type;

use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\AbstractType;

class ServerType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name', 'text')
            ->add('taxCategory', 'sylius_tax_category_choice')
        ;
    }

    public function getName()
    {
        return 'acme_server';
    }
}