如何将 graphql-java-extended-scalars DateTime 与 Jackson 一起使用

Question

我收到了这个错误

Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `org.joda.time.DateTime` (although at least one Creator exists): no suitable creator method found to deserialize from Number value (1564191690.702000000)
 at [Source: UNKNOWN; line: -1, column: -1] (through reference chain: br.com.b2breservas.api.dto.FakeReservationPaginationInput["filter"]->br.com.b2breservas.api.dto.FakeReservationPaginationInputFilter["end"])

Java

import org.joda.time.DateTime;

public class FakeReservationPaginationInput {

    FakeReservationPaginationInputFilter filter;

    CheckoutPermissionInput permission;


}

public class FakeReservationPaginationInputFilter {
    Integer limit;
    List<String> statuses;
    String query;
    DateTime start;
    DateTime end;
}

private final ObjectMapper objectMapper = new ObjectMapper()
        .registerModule(new ParameterNamesModule())
        .registerModule(new Jdk8Module())
        .registerModule(new JavaTimeModule());

// where the error pops up
FakeReservationPaginationInput input = objectMapper
                .convertValue(dataFetchingEnvironment.getArgument("input"), FakeReservationPaginationInput.class);

我正在发送

{
     ..., 
     start: "2019-07-27T01:32:33.116Z",
     end: "2019-07-27T11:32:33.116Z"
}

基本上是

{
     ..., 
     start: moment().format(),
     end: moment().format()
}

架构

scalar DateTime

input QueryReservationsInput {
    filter: ReservationFilter
    permission: CheckoutPermissionInput
}

input ReservationFilter {
    query: String
    statuses: [String]
    limit: Int
    end: DateTime!
    start: DateTime!
}

input CheckoutPermissionInput {
    type: String
    ref_id: Int
    ref_name: String
    chain_id: Int
    chain_name: String
}

Answer 1

这个问题实际上与 GraphQL 无关......它是关于配置 Jackson 以反序列化 JodaTime 类型。尝试正确地隔离您的问题，因为这样可以消除很多干扰，让问题更容易回答，也更容易被更广泛的受众所接受。

无论如何，您正在注册JavaTimeModule，但您使用的是 JodaTime。你需要JodaModule。

<dependency>
  <groupId>com.fasterxml.jackson.datatype</groupId>
  <artifactId>jackson-datatype-joda</artifactId>
  <version>2.9.5</version>
</dependency>

然后

mapper.registerModule(new JodaModule());