初始化项目

app/Models/System/City.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Models\System;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class City extends Model
+{
+    protected $table = 'system_cities';
+
+    protected $fillable = [
+        'parent_id',
+        'name',
+        'code',
+        'pinyin',
+        'pinyin_short',
+        'level',
+        'sort',
+        'status',
+    ];
+
+    protected $casts = [
+        'parent_id' => 'integer',
+        'level' => 'integer',
+        'sort' => 'integer',
+        'status' => 'boolean',
+    ];
+
+    public function children(): HasMany
+    {
+        return $this->hasMany(City::class, 'parent_id')->orderBy('sort');
+    }
+
+    public function activeChildren(): HasMany
+    {
+        return $this->hasMany(City::class, 'parent_id')
+            ->where('status', true)
+            ->orderBy('sort');
+    }
+
+    public function parent()
+    {
+        return $this->belongsTo(City::class, 'parent_id');
+    }
+}