Swagger-ui 显示 List<MonetartyAmount> 为空

Swagger-ui shows null for List<MonetartyAmount>

我在我的 springboot 项目中使用 swagger。 问题出现在 returns 具有 MonetaryAmount 列表的实体的端点,即 (List<MonetaryAmount> rates)

Swagger-ui 为以下端点显示不正确的数据:

{
  "rates": [
    null
  ]
}

但是我希望看到每个 MonetaryAmount 值都是 Double 和 String 对。像这样:

{
  "rates": [
   {"currency":"EUR", "rate": 12.23}
  ]
}

我尝试使用 directModelSubstitute,但它似乎不适用于 List。

这是我的模型:

public class CurrencyRatesResponse implements Serializable {

private List<MonetaryAmount> rates;

public CurrencyRatesResponse() {
}

public CurrencyRatesResponse(List<MonetaryAmount> rates) {
    this.rates = rates;
}

public List<MonetaryAmount> getRates() {
    return rates;
}

public void setRates(List<MonetaryAmount> rates) {
    this.rates = rates;
}
}

这是我的端点示例

@RequestMapping(path = "/public/rates", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public CurrencyRatesResponse getRates() {...}

生成的 swagger JSON:

 "/public/rates":{
         "get":{
            "tags":[
               "rate-endpoint"
            ],
            "summary":"getRates",
            "operationId":"getRatesUsingGET",
            "produces":[
               "application/json;charset=UTF-8"
            ],
            "parameters":[
               {
                 ....
               }
            ],
            "responses":{
               "200":{
                  "description":"OK",
                  "schema":{
                     "$ref":"#/definitions/CurrencyRatesResponse"
                  }
               },
               "401":{
                  "description":"Unauthorized"
               },
               "403":{
                  "description":"Forbidden"
               },
               "404":{
                  "description":"Not Found"
               }
            }
         }
      }
    }  ....

   "CurrencyRatesResponse":{
         "type":"object",
         "properties":{
            "rates":{
               "type":"array",
               "items":{
                  "$ref":"#/definitions/MonetaryAmount"
               }
            }
         },
         "title":"CurrencyRatesResponse"
      },

有几个步骤可以实现。

首先,我们需要适当的 objectMapper,以便 MonetaryAmount 映射到具有两个字段 currencyrate 的适当 object。为此,我们需要为 springfox 的 objectMapper 添加自定义模块。

import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;
import org.zalando.jackson.datatype.money.MoneyModule;
import springfox.documentation.schema.configuration.ObjectMapperConfigured;

@Component
public class SwaggerJacksonModule implements ApplicationListener<ObjectMapperConfigured> {

    @Override
    public void onApplicationEvent(ObjectMapperConfigured event) {
        event.getObjectMapper().registerModule(new MoneyModule());
    }
}

解释: 我们向 springfox 的 ObjectMapperConfigured 事件添加一个侦听器,每当事件被触发时,我们只需获取映射器并注册我们的模块。我使用 Zalando's Jackson Datatype Money 库,这样我就不用自己写了。

下一步将处理实际的 Swagger 表示。让我们创建我们自己的表示 object MonetaryWrapper 我们将用它来替代 MonetaryAmount.

public class MonetaryWrapper {

    private BigDecimal amount;

    private String currency;

  // getters and setters  (getters are important)
}

为了获得正确的单个 object 表示,将 .directModelSubstitute(MonetaryAmount.class, MonetaryWrapper.class) 添加到 Docket object.

就足够了

但是 collections 没那么简单。例如在这种情况下列出。我们需要将 Special AlternateTypeRule object 添加到 Docket object 中,以便正确显示列表。

在 springfox 的 documentation

中有关于此主题的更多详细信息

像这样:

TypeResolver resolver = new TypeResolver();
AlternateTypeRule monetaryAmountListRule =
        newRule(resolver.resolve(List.class,  MonetaryAmount.class),
                resolver.resolve(List.class, MonetaryWrapper.class))

最后我们的 Docket bean 看起来像这样:

@Bean
public Docket productApi() {
    TypeResolver resolver = new TypeResolver();
    AlternateTypeRule monetaryAmountListRule =
            newRule(resolver.resolve(List.class,  MonetaryAmount.class),
                    resolver.resolve(List.class, MonetaryWrapper.class));


    return new Docket(DocumentationType.SWAGGER_2)
            .alternateTypeRules(monetaryAmountListRule)
            .directModelSubstitute(MonetaryAmount.class, MonetaryWrapper.class)
            .select().apis(RequestHandlerSelectors.basePackage("com.swagger.test"))
            .paths(PathSelectors.regex("/public.*")).build();
}

这里还有一些演示截图:

执行请求时的演示:

演示仅用于 object 描述: