<form method="POST">
    <h3>Editing: CarouselController.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

namespace CarouselSlider\REST;

use CarouselSlider\Helper;
use WP_Error;
use WP_REST_Request;
use WP_REST_Response;
use WP_REST_Server;

/**
 * CarouselController
 */
class CarouselController extends ApiController {

	/**
	 * Registers the routes for the objects of the controller.
	 */
	public function register_routes() {
		register_rest_route(
			$this-&gt;namespace,
			'/carousels',
			[
				[
					'methods'             =&gt; WP_REST_Server::READABLE,
					'callback'            =&gt; [ $this, 'get_items' ],
					'permission_callback' =&gt; [ $this, 'get_items_permissions_check' ],
					'args'                =&gt; $this-&gt;get_collection_params(),
				],
				[
					'methods'             =&gt; WP_REST_Server::CREATABLE,
					'callback'            =&gt; [ $this, 'create_item' ],
					'permission_callback' =&gt; [ $this, 'create_item_permissions_check' ],
					'args'                =&gt; [
						'title' =&gt; [
							'description'       =&gt; __( 'The carousel slider title', 'carousel-slider' ),
							'type'              =&gt; 'string',
							'required'          =&gt; true,
							'sanitize_callback' =&gt; 'sanitize_text_field',
							'validate_callback' =&gt; 'rest_validate_request_arg',
						],
						'type'  =&gt; [
							'description'       =&gt; __( 'The carousel slider type', 'carousel-slider' ),
							'type'              =&gt; 'string',
							'required'          =&gt; true,
							'sanitize_callback' =&gt; 'sanitize_text_field',
							'validate_callback' =&gt; 'rest_validate_request_arg',
							'enum'              =&gt; Helper::get_enabled_slider_types_slug(),
						],
					],
				],
			]
		);
		register_rest_route(
			$this-&gt;namespace,
			'/carousels/(?P&lt;id&gt;[\d]+)',
			[
				'args' =&gt; [
					'id' =&gt; [
						'description' =&gt; __( 'Unique identifier for the carousel.', 'carousel-slider' ),
						'type'        =&gt; 'integer',
					],
				],
				[
					'methods'             =&gt; WP_REST_Server::DELETABLE,
					'callback'            =&gt; [ $this, 'delete_item' ],
					'permission_callback' =&gt; [ $this, 'delete_item_permissions_check' ],
					'args'                =&gt; [
						'force' =&gt; [
							'type'        =&gt; 'boolean',
							'default'     =&gt; false,
							'description' =&gt; __( 'Whether to bypass Trash and force deletion.', 'carousel-slider' ),
						],
					],
				],
			]
		);
	}

	/**
	 * Retrieves a collection of items.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 *
	 * @return WP_REST_Response Response object on success, or WP_Error object on failure.
	 */
	public function get_items( $request ) {
		$search   = $request-&gt;get_param( 'search' );
		$page     = (int) $request-&gt;get_param( 'page' );
		$per_page = (int) $request-&gt;get_param( 'per_page' );

		$args = [
			'posts_per_page' =&gt; $per_page,
			'paged'          =&gt; $page,
		];
		if ( ! empty( $search ) ) {
			$args['s'] = $search;
		}
		$get_sliders = Helper::get_sliders( $args );

		$items = [];
		foreach ( $get_sliders as $slider ) {
			$items[] = [
				'id'        =&gt; $slider-&gt;ID,
				'title'     =&gt; $slider-&gt;post_title,
				'type'      =&gt; get_post_meta( $slider-&gt;ID, '_slide_type', true ),
				'edit_link' =&gt; get_edit_post_link( $slider ),
			];
		}

		$counts = wp_count_posts( CAROUSEL_SLIDER_POST_TYPE );
		$count  = $counts-&gt;publish ?? 0;

		return $this-&gt;respond_ok(
			[
				'pagination' =&gt; $this-&gt;get_pagination_data( $count, $per_page, $page ),
				'items'      =&gt; $items,
			]
		);
	}

	/**
	 * Creates one item from the collection.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 *
	 * @return WP_REST_Response Response object on success, or WP_Error object on failure.
	 */
	public function create_item( $request ) {
		$id = Helper::create_slider(
			$request-&gt;get_param( 'title' ),
			$request-&gt;get_param( 'type' )
		);

		if ( is_wp_error( $id ) ) {
			return $this-&gt;respond_unprocessable_entity( $id );
		}

		$post = get_post( $id );

		$response_data = [
			'id'        =&gt; $post-&gt;ID,
			'title'     =&gt; $post-&gt;post_title,
			'type'      =&gt; get_post_meta( $post-&gt;ID, '_slide_type', true ),
			'edit_link' =&gt; get_edit_post_link( $post ),
		];

		do_action( 'carousel_slider/rest_create_slider', $response_data, $request-&gt;get_params() );

		return $this-&gt;respond_created( $response_data );
	}

	/**
	 * Deletes one item from the collection.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 *
	 * @return WP_REST_Response Response object on success, or WP_Error object on failure.
	 */
	public function delete_item( $request ) {
		// As we validated slider existence on permission_callback, no need to validate again.
		$force = $request-&gt;get_param( 'force' );
		$post  = get_post( (int) $request-&gt;get_param( 'id' ) );

		if ( $force ) {
			wp_delete_post( $post-&gt;ID, true );

			return $this-&gt;respond_ok(
				[
					'deleted'  =&gt; true,
					'previous' =&gt; [ 'id' =&gt; $post-&gt;ID ],
				]
			);
		}

		// Otherwise, only trash if we haven't already.
		if ( 'trash' === $post-&gt;post_status ) {
			$this-&gt;set_status_code( 410 );

			return $this-&gt;respond_with_error(
				'rest_already_trashed',
				__( 'The post has already been deleted.', 'carousel-slider' )
			);
		}

		$result = wp_trash_post( $post-&gt;ID );
		if ( ! $result ) {
			return $this-&gt;respond_with_wp_error(
				new WP_Error(
					'rest_cannot_delete',
					__( 'The post cannot be deleted.', 'carousel-slider' ),
					[ 'status' =&gt; 500 ]
				)
			);
		}

		return $this-&gt;respond_ok( [ 'id' =&gt; $post-&gt;ID ] );
	}
}
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