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Aaron Machin

Aaron Machin

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  • First we’ll create the directory for the query resolver by creating the following directory: /server/local/todo/classes/webapi/resolver/querymutation

  • Now let’s create the query mutation resolver class, itemsupdate_item.php in the directory we just created:

    Code Block
    languagephp
    <?php

namespace local_todo\webapi\resolver\mutation;

use core\webapi\execution_context;
use core\webapi\mutation_resolver;
use local_todo\entity\item;

class update_item extends mutation_resolver {

    public static function resolve(array $args, execution_context $ec) {
        $item_id = $args['item_reference']['id'] ?? null;
        $new_title = $args['input']['title'] ?? null;

        $item = new item($item_id);
        $item->title = $new_title;

        return ['item' => $item];
    }
}

    In this file we’ve defined the mutation resolver and we’re using the ORM entity of local_todo to update and return the item.

  • Now we create the type resolver directory /server/local/todo/classes/webapi/resolver/type/ and the type resolver for item item.php in the directory:

    Code Block
    languagephp
    <?php

namespace local_todo\webapi\resolver\type;

use core\webapi\execution_context;
use core\webapi\type_resolver;

class item extends type_resolver {
    /**
     * @param string $field - The field being requested 
     * @param $source - In the case, source will be our `item` entity class as it's what's returned from the query resolver
     * @param array $args
     * @param execution_context $ec
     * @return mixed|void
     */
    public static function resolve(string $field, $source, array $args, execution_context $ec) {
        return $source->$field;
    }
}

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