GraphQL架构相当于这个Json?

时间:2017-12-06 14:51:14

标签: json graphql graphql-js graphql-java

我是GraphQL的新手,想知道是否有人可以帮我弄清楚以下JSON到GraphQL架构中的等价物:

[
 {
   "id": "1",
   "name": "A",
   "fldDef": [
    {
      "name": "f1",
      "type": "str",
      "opt": false
    },
    {
      "name": "f2",
      "type": "bool"
    }]
 },
 {
    "id": "2",
    "name": "B",
    "fldDef": [
     {
       "name": "f3",
       "type": "str",
       "opt": true
     },
     {
       "name": "f4",
       "type": "str",
       "opt": true
     }]
  }
]

到目前为止,我设法将响应映射到下面的对象:

  public class FldDef {

     private String name, type;
     private boolean opt;
     // getters & setters
 } 

 public class Product {

    private String id, name;
    private Map<String, FldDef> fldDef;

   // getters & setters

 }

然后我的架构如下所示,但我遇到的问题是Product对象的一部分,我是Map我希望获得架构适合它,但我很难获得正确的架构!

type FldDef { 
   name: String!
   type: String!
   opt: Boolean!
} 

type Product {
   id: String!
   name: String!
   fldDef: FldDef! // now here I don't know what is the syntax for representing MAP, do you know how to achieve this?
 }

我得到以下异常:

Causedby:com.coxautodev.graphql.tools.TypeClassMatcher$RawClassRequiredForGraphQLMappingException: Type java.util.Map<java.lang.String, com.grapql.research.domain.FldDef> cannot be mapped to a GraphQL type! Since GraphQL-Java deals with erased types at runtime, only non-parameterized classes can represent a GraphQL type. This allows for reverse-lookup by java class in interfaces and union types.

注意:我正在使用Java生态系统(graphql-java)

2 个答案:

答案 0 :(得分:0)

通过JSON提供模式实际上是不可能的,因为模式包含的信息远不仅仅是数据的形状。我认为最好的方法是学习GraphQL的基础知识,设计简单的模式非常简单有趣!也许从graphql.org的学习部分开始。他们有一个关于schema的部分。基本上,您可以从标量(也称为基元)和对象类型构建模式。所有类型还可以包含在非可空类型和/或列表类型中。 GraphQL是为客户设计的。理解GraphQL的最简单方法是对现有API进行一些查询。 Launchpad有很多可以使用的示例(并在您了解JavaScript时进行修改)。

答案 1 :(得分:0)

您可以尝试以下更改:

架构定义:

type FldDef {
   name: String!
   type: String!
   opt: Boolean!
}

type Product {
   id: String!
   name: String!
   fldDef: [FldDef]! // make it as Collection of FldDef
 }

Java类:

public class FldDef {

    private String name;
    private String type;
    private boolean opt;
    // getters & setters
}

public class Product {

    private String id;
    private String name;
    private List<FldDef> fldDef; // Change to List of FldDef
    // getters & setters
}

希望它可以提供帮助。