Writer

The Writer objects will get the converted data from the swag_migration_data table and write it to the right Shopware 6 table. Each Writer supports only one entity, which is most likely the target table.

When creating a writer, register it like this:

<service id="SwagMigrationAssistant\Migration\Writer\ProductWriter"
         parent="SwagMigrationAssistant\Migration\Writer\AbstractWriter">
    <!-- ... -->
    <tag name="shopware.migration.writer"/>
</service>

In most cases, you should extend AbstractWriter, which provides most behavior. You only need to implement the supports method.

// SwagMigrationAssistant\Migration\Writer\ProductWriter

class ProductWriter extends AbstractWriter
{
    public function supports(): string
    {
        return DefaultEntities::PRODUCT;
    }
}

If you need more control over writing, you can implement WriterInterface yourself and the class will receive data in the writeData method. Received data is an array of converted values. The amount depends on the request limit. Error handling is already done in the surrounding MigrationDataWriter class. If writing entries fails with a WriteException from the DAL, it tries to exclude the reported failures and write again. If any other exception occurs, it retries entries one by one to minimize data loss.