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modules/User/Models/Relation.php

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+<?php
+
+namespace Modules\User\Models;
+
+use App\Models\Model;
+use Encore\Admin\Traits\ModelTree;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasManyThrough;
+use Modules\User\Traits\BelongsToUser;
+
+class Relation extends Model
+{
+
+    use BelongsToUser,
+        ModelTree;
+
+    protected $table = 'user_relations';
+
+    protected $primaryKey = 'user_id';
+
+    public function __construct(array $attributes = [])
+    {
+        parent::__construct($attributes);
+
+        $this->setParentColumn('parent_id');
+        $this->setOrderColumn('created_at');
+        $this->setTitleColumn('user_id');
+    }
+
+    /**
+     * 上级用户
+     *
+     * @return BelongsTo
+     */
+    public function parent(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'parent_id');
+    }
+
+    /**
+     * Notes: 关联中间表
+     *
+     * @Author: 玄尘
+     * @Date: 2022/8/19 13:16
+     */
+    public function identities(): BelongsToMany
+    {
+        return $this->belongsToMany(
+            Identity::class,
+            'user_identity',
+            'user_id',
+            'identity_id',
+        );
+    }
+
+
+    /**
+     * 所有下级用户
+     *
+     * @return HasManyThrough
+     */
+    public function children(): HasManyThrough
+    {
+        return $this->hasManyThrough(
+            User::class,
+            Relation::class,
+            'parent_id',
+            'id',
+            'user_id',
+            'user_id'
+        );
+    }
+
+}