PrimaryKeyCanBeCreated.php

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<?php
namespace Magento\Framework\Setup\Declaration\Schema\Declaration\ValidationRules;

use Magento\Framework\Setup\Declaration\Schema\Declaration\ValidationInterface;
use Magento\Framework\Setup\Declaration\Schema\Dto\Columns\ColumnNullableAwareInterface;
use Magento\Framework\Setup\Declaration\Schema\Dto\Schema;

class PrimaryKeyCanBeCreated implements ValidationInterface
{
    const ERROR_TYPE = 'primary_key_cant_be_applied';

    const ERROR_MESSAGE = 'Primary key can`t be applied on table "%s". ';

    public function validate(Schema $schema)
    {
        $errors = [];
        foreach ($schema->getTables() as $table) {
            $primaryConstraint = $table->getPrimaryConstraint();

            if (!$primaryConstraint) {
                continue;
            }

            foreach ($primaryConstraint->getColumns() as $column) {
                if ($column instanceof ColumnNullableAwareInterface &&
                    $column->isNullable()
                ) {
                    $errors[] = [
                        'column' => $column->getName(),
                        'message' => sprintf(self::ERROR_MESSAGE, $table->getName()) .
                            "All columns should be not nullable"
                    ];
                }
            }
        }

        return $errors;
    }
}