Java Spring 投影内投影 [英] Java Spring projection inside projection

问题描述

是否可以使用投影并在某些相关对象中使用它自己的投影?

Is it possible to use a projection and in some related object use it's own projection?

例如，有Exam，即有List.我想请求一份考试列表(我有一个 @projection)，但我想定义要为每个相关 Question 检索的属性/p>

For example, a have Exam, that has List<Question>. I'd like to request a list of exams (which I have a @projection), but I'd like to define the attributes to be retrieved for each related Question

推荐答案

如果我理解正确，您想使用 Projection 作为 Projection 的子项.如果是这样，是的，你可以.您可以创建一个 QuestionProjection 并在 ExamProjection 中使用.

If I understand correctly you want to use Projection as children of Projection. If it is the case, yes, you can. You can create a QuestionProjection and use inside the ExamProjection.

示例:

@Projection(name = "questionProjection", types = { Question.class }) 
public interface QuestionProjection {
    // Getters
}

@Projection(name = "examProjection", types = { Exam.class }) 
public interface ExamProjection {
    List<QuestionProjection> getQuestionList();

    // Other Getters
}

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