为带有多选枚举字段的域对象创建表单失败，并显示“属性xxx类型不匹配”

如何解决为带有多选枚举字段的域对象创建表单失败，并显示“属性xxx类型不匹配”

我正在使用带有GORM 7.0.7的Grails 4.0.4.RELEASE 我正在使用的数据库是MongoDB

我可以成功运行该应用程序，并导航到该域类的创建表单。我可以为单例字段someOtherEnum选择值。我可以为categories字段选择多个值。但是，当我提交表单时，会收到以下消息：“属性类别类型不匹配”。我根据此处发布的另一个问题的答案使用了这种方法，但它对我不起作用。我没有像该用户那样使用嵌入式枚举或hasMany集合。

控制器和服务是由generate-all命令生成的。

How to add a multiple enum field to the create and edit forms in Grails 4?

我在src/main/groovy/com/project/core/dsl中有一个枚举，我正在用来为域类填充一个多选字段：

package com.project.core.dsl

import groovy.transform.CompileStatic

@CompileStatic
enum Category {
   CATEGORY_ONE("Category One"),CATEGORY_TWO("Category Two"),CATEGORY_THREE("Category Three")

   private final String id

   private Category(String id) { this.id = id }

   @Override
   String toString() { id }

   String getKey() { name() }
}

域类：

package com.project.core

import com.project.core.dsl.someOtherEnum
import com.project.core.dsl.Category

class DomainObject {

    SomeOtherEnum someOtherEnum
    Set<Category> categories

    static constraints = {
    }

    static mapping = {
        someOtherEnum index: true
    }

    @Override
    String toString() {
        return "DomainObject{" +
            "someOtherEnum=" + someOtherEnum +
            ",categories=" + categories +
            '}';
    }
}

在create.gsp视图中，我具有以下形式：

<g:form resource="${this.domainObject}" method="POST">
    <fieldset class="form">
        <f:with bean="domainObject">
            <f:field property="someOtherEnum"/>
            <f:field property="categories">
                <g:select
                    multiple="true"
                    name="${property}"
                    from="${Category}"
                    value="${domainObject?.categories}"
                />
            </f:field>
        </f:with>

    </fieldset>
    <fieldset class="buttons">
        <g:submitButton name="create" class="save" value="${message(code: 'default.button.create.label',default: 'Create')}" />
    </fieldset>
</g:form>

域类控制器：

package com.project.core

import grails.validation.ValidationException
import static org.springframework.http.HttpStatus.*

class DomainObject {

    DomainObjectService domainObjectService

    static allowedMethods = [save: "POST",update: "PUT",delete: "DELETE"]

    def index(Integer max) {
        params.max = Math.min(max ?: 10,100)
        respond domainObjectService.list(params),model:[domainObjectCount: domainObjectService.count()]
    }

    def show(Long id) {
        respond domainObjectService.get(id)
    }

    def create() {
        respond new DomainObject(params)
    }

    def save(DomainObject domainObject) {
        if (domainObject == null) {
            notFound()
            return
        }

        try {
            domainObjectService.save(domainObject)
        } catch (ValidationException e) {
            respond domainObject.errors,view:'create'
            return
        }

        request.withFormat {
            form multipartForm {
                flash.message = message(code: 'default.created.message',args: [message(code: 'domainObject.label',default: 'DomainObject'),domainObject.id])
                redirect domainObject
            }
            '*' { respond domainObject,[status: CREATED] }
        }
    }

    def edit(Long id) {
        respond domainObjectService.get(id)
    }

    def update(DomainObject domainObject) {
        if (domainObject == null) {
            notFound()
            return
        }

        try {
            domainObjectService.save(domainObject)
        } catch (ValidationException e) {
            respond domainObject.errors,view:'edit'
            return
        }

        request.withFormat {
            form multipartForm {
                flash.message = message(code: 'default.updated.message',domainObject.id])
                redirect domainObject
            }
            '*'{ respond domainObject,[status: OK] }
        }
    }

    def delete(Long id) {
        if (id == null) {
            notFound()
            return
        }

        domainObjectService.delete(id)

        request.withFormat {
            form multipartForm {
                flash.message = message(code: 'default.deleted.message',id])
                redirect action:"index",method:"GET"
            }
            '*'{ render status: NO_CONTENT }
        }
    }

    protected void notFound() {
        request.withFormat {
            form multipartForm {
                flash.message = message(code: 'default.not.found.message',params.id])
                redirect action: "index",method: "GET"
            }
            '*'{ render status: NOT_FOUND }
        }
    }
}

域对象服务：

package com.project.core

import grails.gorm.services.Service

@Service(DomainObject)
interface DomainObjectService {

    DomainObject get(Serializable id)

    List<DomainObject> list(Map args)

    Long count()

    void delete(Serializable id)

    DomainObject save(DomainObject domainObject)

}

解决方法

通过进行以下更改，我克服了我的错误。我在DomainObject

中添加了hasMany语句

static hasMany = [categories: Category]

我在create.gsp文件中做了以下更改：

<f:field property="categories">
    <g:select
         multiple="true"
         name="${property}"
         from="${Category?.values()}"
         optionKey="key"
         value="${domainObject?.categories}"
    />
</f:field>