添加 app/Traits/TreePath.php

app/Traits/TreePath.php

@@ -0,0 +1,84 @@
+<?php
+
+namespace App\Traits;
+
+use Illuminate\Database\Eloquent\Casts\Attribute;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * Model Tree
+ *
+ * parent_id: 上级id, 默认: 0
+ * path: 所有上级id, 例如: -1-2-3-
+ * sort: 排序(正序)
+ */
+trait TreePath
+{
+    protected static function booted(): void
+    {
+        static::creating(function (Model $model) {
+            if ($model->parent_id) {
+                $parent = static::query()->findOrFail($model->parent_id);
+                $model->path = $parent->path . $parent->id . '-';
+            } else {
+                $model->parent_id = 0;
+                $model->path = '-';
+            }
+        });
+
+        static::updating(function (Model $model) {
+            if ($model->parent_id) {
+                $parent = static::query()->findOrFail($model->parent_id);
+                $model->path = $parent->path . $parent->id . '-';
+            } else {
+                $model->parent_id = 0;
+                $model->path = '-';
+            }
+        });
+
+        static::deleting(function (Model $model) {
+            static::query()->allChildren($model->id)->delete();
+        });
+    }
+    protected function parentIds(): Attribute
+    {
+        return Attribute::make(
+            get: fn () => explode('-', substr($this->path, 1, -1)),
+        );
+    }
+
+    public function children()
+    {
+        return $this->hasMany(static::class, 'parent_id');
+    }
+
+    public function parent()
+    {
+        return $this->belongsTo(static::class, 'parent_id');
+    }
+
+    public function scopeAllChildren($q, $pid)
+    {
+        return $q->where('path', 'like', '%-'.$pid.'-%');
+    }
+
+    public function scopeSort($q)
+    {
+        return $q->orderBy('parent_id')->orderBy('sort');
+    }
+
+    public static function getTreeList($list, $pid = 0)
+    {
+        $tree = collect();
+        foreach ($list->where('parent_id', $pid)->all() as $item) {
+            $item->children = [];
+            $children = $list->where('parent_id', $item->id);
+            if ($children->count() > 0) {
+                $item->children = static::getTreeList($list, $item->id);
+            }
+            $tree->push($item);
+        }
+
+        return $tree;
+    }
+}