雄辩关系两个父母和孩子

Question

我有三张桌子：1。问题库2.问题类型3.问题

我需要检索json响应：

[{"questiontitle":"OSCE","questionbank":"osce bank","questiontype":"osce type"}]

我的模特是：

1. 试题库

   类Questionbank扩展了模型{

   protected $fillable = [];
   
   protected $table = "QuestionBank";
   
   protected $dates = [];
   protected $primaryKey = "QuestionBankID";
   
   protected $visible = ["QuestionBank"];
   
   public static $rules = [
       // Validation rules
   ];
   

   }

2. questiontype

   class questiontype扩展了Model {

   protected $fillable = [];
   
   protected $dates = [];
   
   protected $table = "QuestionType";
   
   protected $primarykey = "QuestionTypeID";
   
   protected $visible = ["QuestionType"];
   
   public static $rules = [
       // Validation rules
   ];
   
   // Relationships
   

   }

3. 问题

   class Questions扩展了Model {

   protected $fillable = ["QuestionTitle"];
   
   protected $dates = [];
   
   protected $primaryKey = "QuestionID";
   protected $foreignKey = "QuestionBankID";
   
   public static $rules = [
       // Validation rules
   ];
   protected $visible = ["QuestionTitle","QuestionBank","QuestionType"];
   // Relationships
   

   public function QuestionBank（）{         返回$ this-＆gt; hasManyThrough（'App \ QuestionBank'，'App \ questiontype'，'QuestionBankID'，'QuestionTypeID'，'QuestionBankID'，'QuestionTypeID'）;     } }

我收到了错误：

Column not found: 1054 Unknown column 'QuestionType.QuestionBankID' in 'field list' (SQL: select `QuestionBank`.*, `QuestionType`.`QuestionBankID` from `QuestionBank` inner join `QuestionType` on `QuestionType`.`QuestionTypeID` = `QuestionBank`.`QuestionTypeID` where `QuestionType`.`QuestionBankID`