DummyQueryTrait.php

<?php

namespace Drupal\migrate\Plugin\migrate\source;


/**
 * Provides a dummy select query object for source plugins.
 *
 * Trait providing a dummy select query object for source plugins based on
 * SqlBase which override initializeIterator() to obtain their data from other
 * SqlBase services instead of a direct query. This ensures that query() returns
 * a valid object, even though it is not used for iteration.
 */
trait DummyQueryTrait {
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        // Pass an arbitrary table name - the query should never be executed
        // anyway.
        $query = $this->select(uniqid(), 's')
            ->range(0, 1);
        $query->addExpression('1');
        return $query;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function doCount() {
        return 1;
    }

}