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In this tutorial, we will make a change to the Registry Index, specifically aim at the Portal collection and will add a new field

Create a new file at /applications/registry/maintenance/migrations/registry_index , assuming the latest migration available here is 019, we will create a new file called 020_SampleMigration.php

<?php
/**
 * Class:  highlightFields
 *
 * @author: Minh Duc Nguyen <minh.nguyen@ands.org.au>
 */

namespace ANDS;


class SampleMigration extends GenericSolrMigration
{

    /**
     * highlightFields constructor.
     */
    public function __construct()
    {
        parent::__construct();
        $this->setFields([
            [
                'name' => 'new_field',
                'type' => 'text_en_splitting',
                'stored' => true,
                'indexed' => true,
                'multiValued' => true
            ],
        ]);
    }
}

The setField functionality will ensure that the field define in this list will get into the index. If the field already exists, it will do a replace, if the field doesn't exist, it will create it. 

copyField

use the setCopyFields functionality like so

$this->setCopyFields([
    ['source' => '*', 'dest' => 'fulltext'],
    ['source' => 'group', 'dest' => ['group_sort', 'group_search']],
    ['source' => 'type', 'dest' => ['type_sort', 'type_search']]
]);

Custom up() and down()

If there's any other specific actions (eg. defining a new field type) that needs to run after the default up() and down(). It can be override like so

/**
 * Replacing the default field type of location_rpt as well
 * @Note requires jts-1.8.0.jar installed in SOLR lib directory
 * @Override
 * @return mixed
 */
function up()
{
    $result = array();
    $result[] = parent::up();
    $result[] = $this->ci->solr->schema([
        'replace-field-type' => [
            'name' => 'location_rpt',
            'class' => 'solr.SpatialRecursivePrefixTreeFieldType',
            'spatialContextFactory' => 'com.spatial4j.core.context.jts.JtsSpatialContextFactory',
            'geo' => true,
            'distErrPct' => '0.025',
            'maxDistErr' => '0.000009',
            'units' => 'degrees'
        ]
    ]);
    return $result;
}
 
/**
 * Return the field back to it's original state
 * @Override
 * @return mixed
 */
function down()
{
    $result = array();
    $result[] = parent::up();
    $result[] = $this->ci->solr->schema([
        'replace-field-type' => [
            'name' => 'location_rpt',
            'class' => 'solr.SpatialRecursivePrefixTreeFieldType',
            'geo' => true,
            'distErrPct' => '0.025',
            'maxDistErr' => '0.001'
        ]
    ]);
    return $result;
}