无法存储带有问题的标签：给出的字符串

如何解决无法存储带有问题的标签：给出的字符串

嗨，我是 Laravel 初学者，并且拥有 Laravel 8 的 API

我想在我的项目中存储带有问题的标签，问题和标签之间的关系是多态的（poly 因为我有另一个表而且它们也有标签字段）

在我的 QuestionController() 中，当我想存储问题和标签时，出现此错误：

"Argument 1 passed to Illuminate\\Database\\Eloquent\\Relations\\BelongsToMany::save() must be an instance of Illuminate\\Database\\Eloquent\\Model,string given

当我使用 save 而不是 savemany() 时会出现此错误：

"message": "Argument 1 passed to Illuminate\\Database\\Eloquent\\Relations\\BelongsToMany::save() must be an instance of Illuminate\\Database\\Eloquent\\Model,array given

我也使用了 sync() ，但标签没有存储在数据库中

我和邮递员一起品尝了

块引用

而 method 是这样的：

 public function store(StoreQuestionRequest $request)
    {
        $validatedData = $request->all();

      ////Because there is no need storage images and question codes

        $question = Question::create($validatedData); //store question

        //store tags
        $tag = new Tag();

        $tags = explode(",",$request->tag);//separate tags

        $tag['tag'] = $tags;

        $question->tags()->savemany($tags);

        return response()->json([
            'success'=>true,'message'=> 'successfully','data'=>$question
        ]);
    }

所以如果您需要了解 relations ，这些是我的模型：

Question：

 public function tags(){
        return $this->morphToMany(Tag::class,'taggable');
    }

Tag：

 public function questions(){
        return $this->morphedByMany(Question::class,'taggable');
    }

感谢您的帮助和关注，我真的需要解决这个问题

解决方法

尝试 -------------------------------------------------------------------------------- ( group and capture to \1: -------------------------------------------------------------------------------- \. '.' -------------------------------------------------------------------------------- AddMyString 'AddMyString' -------------------------------------------------------------------------------- \( '(' -------------------------------------------------------------------------------- " '"' -------------------------------------------------------------------------------- .*? any character except \n (0 or more times (matching the least amount possible)) -------------------------------------------------------------------------------- " '"' -------------------------------------------------------------------------------- \) ')' -------------------------------------------------------------------------------- ) end of \1 -------------------------------------------------------------------------------- (?! look ahead to see if there is not: -------------------------------------------------------------------------------- [\s\S\r]* any character of: whitespace (\n,\r,\t,\f,and " "),non-whitespace (all but \n,'\r' (carriage return) (0 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- \1 what was matched by capture \1 -------------------------------------------------------------------------------- ) end of look-ahead 但您需要传递标签的 id，而不是标签本身。

如果用户只是在标签之间进行选择，您可以将他选择的标签的 id 作为数组与请求中的问题一起发送，然后将其传递给 attach 方法

attach()

如果用户创建了标签，您可以收集新的 ID 并将它们传递给附件

$question->tags()->attach($request->tagsIds);

希望这对你有用

,

解决了：

 public function store(StoreQuestionRequest $request)
    {
        $validatedData = $request->all();

      ////Because there is no need storage images and question codes

        $question = Question::create($validatedData); //store question

        //store tags

       $tagNames = explode(",",$request->tag);//separate tags

        $tagIds = [];

        foreach($tagNames as $tagName)
        {
            $tag = Tag::firstOrCreate(['tag'=>$tagName]);
            if($tag)
            {
              $tagIds[] = $tag->id;
            }
        }
        $question->tags()->sync($tagIds);


        return response()->json([
            'success'=>true,'message'=> 'successfully','data'=>$question
        ]);
    }