如何将params数据绑定到具有list / set属性的域对象？

Question

我对grails数据绑定所面临的行为感到困惑。我将从控制器代码

开始

def saveQuestion(){
   QuestionSurvey question = new QuestionSurvey();
   bindData(question, params);
   question.save(); 
}

QuestionSurvey域名也是

class QuestionSurvey {

    String questionText
    QuestionTypeSurvey questionType

    static hasMany = [options: QuestionOptionSurvey]

    static mapping = {  
        questionType enumType: 'ordinal'
    }

    static constraints = {}
}

另外，QuestionOptionSurvey域看起来像

class QuestionOptionSurvey {

    String optionText

    static belongsTo = [question: QuestionSurvey]

    static constraints = { }
}

我认为绑定适用于所有属性，但不适用于QuestionSurvey域中的“选项”字段。我得到的错误是

TypeMismatchException: Provided id of the wrong type for class QuestionOptionSurvey.  

Expected class java.lang.Long got java.lang.String. So my question is how to get around   

this problem of binding params to a domain that has a field of type set of another domain 

class?

params.options是一个字符串列表，例如['option1'，'option2'，'option2']。

Answer 1

为了正确绑定options属性/集合，您的参数应使用以下元素名称发布：options.optionText。否则，它会期望您发布ID并尝试找到与这些ID匹配的QuestionOptionSurvey。