API Controllers

Sloth can auto-discover REST API controllers from app/Api/ or theme/Api/. Drop a class extending Sloth\Api\Controller in either directory and Sloth registers the endpoints automatically under /wp-json/sloth/v1/.

tip

Use API controllers for structured, resource-oriented endpoints. For quick one-off endpoints or module data, Modules with $json enabled may be a simpler fit.

Creating a controller

<?php

namespace App\Api;

use App\Model\Project;
use Sloth\Api\Controller;

class ProjectController extends Controller
{
    public function index(): array
    {
        return Project::all()->toArray();
    }

    public function single(int $id): array
    {
        $project = Project::find($id);

        if (!$project) {
            $this->setStatusCode(404);
            return [];
        }

        return $project->toArray();
    }

    public function featured(): array
    {
        return Project::taxonomy('category', 'featured')->get()->toArray();
    }
}

Route mapping

Routes are derived from the class and method names automatically. The class name determines the route prefix — ProjectController becomes project:

Method	Route
index()	GET /wp-json/sloth/v1/project
single()	GET /wp-json/sloth/v1/project/{id}
featured()	GET /wp-json/sloth/v1/project/featured/{id?}

The rules are:

• If the controller has a single() method: index() maps to /{prefix}, single() maps to /{prefix}/{id?}
• If no single() method: index() maps to /{prefix}/{id?}
• All other public methods map to /{prefix}/{method-name}/{id?}
• Methods starting with _ are excluded

All routes accept GET, POST, PUT and DELETE. Inspect $this->request->get_method() inside the controller to branch by method.

Accessing the request

public function index(): array
{
    $method = $this->request->get_method();       // GET, POST, …
    $params = $this->request->get_query_params();  // ?foo=bar
    $body   = $this->request->get_json_params();   // JSON body
    $id     = $this->request->get_param('id');     // URL param
}

Status codes

public function single(int $id): array
{
    $project = Project::find($id);

    if (!$project) {
        $this->setStatusCode(404);
        return [];
    }

    return $project->toArray();
}

Error responses automatically include the HTTP status text:

{ "code": 404, "message": "Not Found" }

URL generation

Generate URLs to controller endpoints from PHP:

$controller = new ProjectController();
$controller->getUrl('featured');            // /wp-json/sloth/v1/project/featured
$controller->getUrl('featured', ['page' => 2]); // …?page=2

:::tip Production deployment After deploying new or renamed API controllers, run wp sloth manifest:clear to regenerate the manifest cache. See Auto-Discovery. :::