Question

我正在尝试将请求绑定到命令对象。我必须在命令对象中映射一个集合，但我收到错误“类型不匹配，拒绝值null”。我被困在这里，我怎么能解决这个问题。

我的命令对象是

@Validateable
public class CreateFundingCommand extends BaseCommand {
    Set<Causes> 
}

我的域类是

class CrowdFunding extends BaseEntity{

Set<Causes> 

}

我的控制器是

 def saveCreateFunding(CreateFundingCommand createFundingCommand){
        log.debug"hello"+params
        createFundingCommand.validate()
        if(createFundingCommand.hasErrors()){
            log.debugg"errors"+createFundingCommand.errors
        }else{
            crowdFundingService.saveCreateFunding(createFundingCommand.getCrowdFunding())
        }
    }

原因类是

class Causes extends BaseEntity {
    String name
    String description
    String icon
}

我的参数是：

causes:{"name":"prabh","description":"ggg","icon":"deec"}

错误是：

rejected value [{"name":"prabh","description":"ggg","icon":"deec"}]; codes [com.volcare.command.crowdFunding.CreateFundingCommand.causes.typeMismatch.error,com.volcare.command.crowdFunding.CreateFundingCommand.causes.typeMismatch,createFundingCommand.causes.typeMismatch.error,createFundingCommand.causes.typeMismatch,typeMismatch.com.volcare.command.crowdFunding.CreateFundingCommand.causes,typeMismatch.causes,typeMismatch.java.util.Set,typeMismatch]; arguments [causes]; default message [Could not find matching constructor for: com.volcare.domain.setting.Causes(java.lang.String)]

Answer 1

问题可能如下：

causes:{"name":"prabh","description":"ggg","icon":"deec"}

你可能希望它是这样的：

causes:[{"name":"prabh","description":"ggg","icon":"deec"}]

请注意，causes的值应该是Map的列表，而不是Map。

见https://github.com/jeffbrown/fundbinding。该项目包括以下内容：

的src /常规/演示/ CreateFundingCommand.groovy

package demo

@grails.validation.Validateable
class CreateFundingCommand extends BaseCommand {
    Set<Cause> causes
}

的grails-app /控制器/演示/ DemoController.groovy

package demo

class DemoController {

    def saveCreateFunding(CreateFundingCommand createFundingCommand){
        if(createFundingCommand.hasErrors()){
            render 'Errors were found'
        }else{
            render 'No errors were found'
        }
    }
}

测试/单元/演示/ DemoControllerSpec.groovy

package demo

import grails.test.mixin.TestFor
import spock.lang.Specification

@TestFor(DemoController)
class DemoControllerSpec extends Specification {

    void "test valid command object"() {
        when:
        request.json = '{"causes":[{"name":"prabh","description":"ggg","icon":"deec"}]}'
        controller.saveCreateFunding()

        then:
        response.text == 'No errors were found'
    }

    void "test invalid command object"() {
        when:
        request.json = '{"causes":{"name":"prabh","description":"ggg","icon":"deec"}}'
        controller.saveCreateFunding()

        then:
        response.text == 'Errors were found'
    }
}

另请注意，在您的代码中，您在控制器操作中调用了createFundingCommand.validate()，这是不必要的。在代码执行之前，该实例已经过验证。

我希望有所帮助。

在命令对象中绑定集合时出错

1 个答案: