Convert select fields in bolt's contenttype

convert_select.php

<?
/**
 * ### convert_select
 * Sometimes you set values as ['foo', 'bar'] and bolt stores them as strings in db. 
 * It works ok, if you set values as ['':'', 0: 'foo', 1: bar] in contenttypes.yml.
 * I wanted to update my old values, so i created a util function. Here it is, use however you want.
 * 
 * @param Application $app
 * @param string      $contenttype_slug
 * @param array       $allowed_fields - select fields that should be processed (for ex. ['vendors', 'models']).<br>
 *                                      Leave it = [] if you want all fields. [] by default
 * @param bool|false  $do_throw_exceptions - use that for dev mode if you want to break on possible errors.
 */
function convert_select ($app, $contenttype_slug, $allowed_fields = [], $do_throw_exceptions = false) {
    // getting reverse mappings
    $contenttype = $app['storage']->getContentType($contenttype_slug);
    $fields = $contenttype['fields'];
    $mappings = [];
    foreach ($fields as $field_name => $field_data) {
        if ($allowed_fields && !in_array($field_name, $allowed_fields))
            continue;

        if (empty($field_data['type'])) {
            if ($do_throw_exceptions)  throw new Exception("No type for field $field_name in $contenttype_slug");
            else continue;
        }

        if ($field_data['type'] === 'select') {
            if (empty($field_data['values'])) continue; // no values set
            $keys = array_keys($field_data['values']);
            $values = array_values($field_data['values']);

            // checking if bolt returns the array: ['foo'=>'foo', 'bar'=>'bar']
            $identical = true;
            foreach ($keys as $i=>$key) {
                if ($key !== $values[$i]) {
                    $identical = false;
                    break;
                }
            }
            if ($identical){
                if ($do_throw_exceptions)  throw new Exception("$contenttype_slug / $field_name won't be processed. Values are set using incorrect format. Should be ['':'', '0': 'bar', '1' : 'foo', ...]");
                else return;
            }
            $mappings[$field_name] = array_flip($field_data['values']); // use array_flip(array_values($field_data['values'])); if you want to convert
        }
    }

    if (!$mappings){
        if ($do_throw_exceptions)  throw new Exception("Nothing to do: no 'select'-type fields in $contenttype_slug");
        else return;
    }

    // getting records
    $repo = $app['storage']->getRepository($contenttype_slug); /* @var Repository $repo */
    $records = $repo->findAll();

    if (!$records){
        if ($do_throw_exceptions)  throw new Exception("Nothing to do: no records in $contenttype_slug table.");
        else return;
    }

    // main loop of replacements
    foreach ($records as $record) {
        /* @var Entity $record*/
        foreach ($mappings as $field_name => $field_mapping) {
            $vals = @json_decode($record->__get($field_name));
            if (json_last_error() !== JSON_ERROR_NONE){ // some error occured = skipping
                if ($do_throw_exceptions)  throw new Exception( "Wrong values in $field_name in $contenttype_slug. Id = ". $record->getId());
                else continue;
            }

            if ($vals) {
                $new_vals = [];
                foreach ($vals as $val) {
                    if (isset($field_mapping[(string)$val])){
                        $new_vals[] = $field_mapping[(string)$val];
                    }
                }

                $record->__set($field_name, json_encode($new_vals));
            }
        }

        $repo->save($record);
    }
}