改进数据写入

src/Model.php

@@ -707,7 +707,7 @@ protected function updateData(): bool
         // 检查允许字段
         $allowFields = $this->checkAllowFields();
 
-        foreach ($this->relationWrite as $name => $val) {
+        foreach ($this->relationWrite as $val) {
             if (!is_array($val)) {
                 continue;
             }
@@ -760,34 +760,29 @@ protected function insertData(string $sequence = null): bool
         }
 
         $this->checkData();
-        $data = $this->data;
 
         // 主键自动写入
         if ($this->isAutoWriteId()) {
             $pk = $this->getPk();
-            if (is_string($pk) && !isset($data[$pk])) {
-                $data[$pk]       = $this->autoWriteId();
-                $this->data[$pk] = $data[$pk];
+            if (is_string($pk) && !isset($this->data[$pk])) {
+                $this->data[$pk] = $this->autoWriteId();
             }
         }
 
         // 时间字段自动写入
         if ($this->autoWriteTimestamp) {
-            if ($this->createTime && !array_key_exists($this->createTime, $data)) {
-                $data[$this->createTime]       = $this->autoWriteTimestamp();
-                $this->data[$this->createTime] = $data[$this->createTime];
-            }
-
-            if ($this->updateTime && !array_key_exists($this->updateTime, $data)) {
-                $data[$this->updateTime]       = $this->autoWriteTimestamp();
-                $this->data[$this->updateTime] = $data[$this->updateTime];
+            foreach ([$this->createTime, $this->updateTime] as $field) {
+                if ($field && !array_key_exists($field, $this->data)) {
+                    $this->data[$field] = $this->autoWriteTimestamp();
+                }
             }
         }
 
         // 检查允许字段
         $allowFields = $this->checkAllowFields();
 
-        $db = $this->db();
+        $db   = $this->db();
+        $data = $this->data;
 
         $db->transaction(function () use ($data, $sequence, $allowFields, $db) {
             $result = $db->strict(false)