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app/JsonRpc/Service/CampusService.php

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+<?php
+
+declare(strict_types=1);
+
+namespace App\JsonRpc\Service;
+
+use Aether\AetherCrudService;
+use Aether\AetherModel;
+use Aether\AetherValidator;
+use Aether\Exception\BusinessException;
+use App\Model\Campus;
+use App\Validator\CampusValidator;
+use Hyperf\Di\Annotation\Inject;
+
+class CampusService extends AetherCrudService
+{
+    #[Inject]
+    protected Campus $campusModel;
+
+    #[Inject]
+    protected CampusValidator $campusValidator;
+
+    /**
+     * 获取省份列表.
+     */
+    public function getProvinces(): array
+    {
+        return $this->campusModel->level(1)
+            ->enabled()
+            ->orderBy('name')
+            ->get(['id', 'name', 'province'])
+            ->toArray();
+    }
+
+    /**
+     * 根据省份获取城市列表.
+     * @throws BusinessException
+     */
+    public function getCitiesByProvince(string $province): array
+    {
+        return $this->campusModel->level(2)
+            ->province($province)
+            ->enabled()
+            ->orderBy('name')
+            ->get(['id', 'name', 'city'])
+            ->toArray();
+    }
+
+    protected function getModel(): AetherModel
+    {
+        return $this->campusModel;
+    }
+
+    protected function getValidator(): AetherValidator
+    {
+        return $this->campusValidator;
+    }
+}