``` public function beforeSave($insert) { if (!$insert) { if (count(explode(",", $this->child_arr)) > 1) { $this->child = 1; } else { $this->child = 0; } } return parent::beforeSave($insert); } public function afterSave($insert, $changedAttributes) { parent::afterSave($insert, $changedAttributes); if ($insert) { $this->child_arr = (string)$this->id; if ($this->parent_id) { $parent = static::findOne($this->parent_id); $parent->child_arr = $parent->child_arr . ',' . $this->id; $parent->save(); $this->parent_arr = $parent->parent_arr . ',' . $this->parent_id; $parents = explode(",", $parent->parent_arr); foreach ($parents as $parent_id) { if (!$parent_id) { continue; } $parent = static::findOne($parent_id); $parent->child_arr = $parent->child_arr . ',' . $this->id; $parent->save(); } } $this->save(); } else { if (isset($changedAttributes['parent_id'])) { $child_arr = explode(",", $this->child_arr); $old_parent_arr = $this->parent_arr; if ($changedAttributes['parent_id']) { $parent_arr = explode(",", $this->parent_arr); array_shift($parent_arr); foreach ($parent_arr as $parent_id) { $parent = static::findOne($parent_id); $parent_child_arr = explode(",", $parent->child_arr); $parent_child_arr = array_diff($parent_child_arr, $child_arr); $parent_child_arr = join(",", $parent_child_arr); $parent->child_arr = $parent_child_arr; $parent->save(); } } if ($this->parent_id) { $parent = static::findOne($this->parent_id); $parent_child_arr = explode(",", $parent->child_arr); $parent_child_arr = array_merge($parent_child_arr, $child_arr); $parent_child_arr = join(",", $parent_child_arr); $parent->child_arr = $parent_child_arr; $parent->save(); $this->parent_arr = $parent->parent_arr . ',' . $this- >parent_id; $parents = explode(",", $parent->parent_arr); foreach ($parents as $parent_id) { if (!$parent_id) { continue; } $parent = static::findOne($parent_id); $parent_child_arr = explode(",", $parent->child_arr); $parent_child_arr = array_merge($parent_child_arr, $child_arr); $parent_child_arr = join(",", $parent_child_arr); $parent->child_arr = $parent_child_arr; $parent->save(); } } else { $this->parent_arr = '0'; } foreach ($child_arr as $id) { if ($id == $this->id) { continue; } $child = static::findOne($id); $child->parent_arr = str_replace($old_parent_arr, $this- >parent_arr, $child->parent_arr); $child->save(); } $this->save(); } if (isset($changedAttributes['status'])) { if ($this->child != 0) { static::updateAll(['status' => $this->status], ['parent_id' => $this->id]); } } } if (isset($changedAttributes['sort'])) { if ($this->parent_id) { $parent = static::findOne($this->parent_id); $child_arr = $parent->id; $childs = static::find()->where(['parent_id' => $this- >parent_id])->orderBy(['sort' => SORT_ASC])->all(); foreach ($childs as $child) { $child_arr .= "," . $child->child_arr; } $parent->child_arr = $child_arr; $parent->save(); } } } ```