如何解决在使用 Kotlin 和 Neo4j 的 Spring Boot 应用程序中为 Map<String, Set <String>> 使用 @CompositeProperty 注释
我有一个关于在带有 Kotlin 和 Neo4j 的 Spring Boot 应用程序中将 @CompositeProperty 用于 Map
plugins {
id("org.springframework.boot") version "2.5.0-SNAPSHOT"
id("io.spring.dependency-management") version "1.0.11.RELEASE"
kotlin("jvm") version "1.4.30"
kotlin("plugin.spring") version "1.4.30"
}
dependencies {
implementation("org.springframework.boot:spring-boot-starter-data-neo4j")
implementation("org.springframework.boot:spring-boot-starter-webflux")
implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.12.+")
developmentOnly("org.springframework.boot:spring-boot-devtools")
testImplementation("org.springframework.boot:spring-boot-starter-test")
testImplementation("io.projectreactor:reactor-test")
}
我想在实体中有一个 Map,它包含一个字符串作为键和一组字符串作为值 (Map
@Node("Skill")
data class Skill(
@Id
@GeneratedValue
@JsonIgnore
val id: Long?,@Property("uuid")
val uuid: UUID?,@CompositeProperty
val description: Map<String,Set<String>>?,
路由器:
@SpringBootApplication
internal class SkillApplication {
@Bean
fun route(handler: SkillHandler) = router {
GET("$SKILL_ROUTE/$ID_PATH_PATTERN",handler::findByUuid)
GET(SKILL_ROUTE,handler::findAll)
POST(SKILL_ROUTE,handler::create)
}
companion object {
const val SKILL_ROUTE = "/skill"
const val ID_PATH_VAR = "id"
const val ID_PATH_PATTERN = "{$ID_PATH_VAR:${ID_PATTERN}}"
}
}
fun main(args: Array<String>) {
runApplication<SkillApplication>(*args)
}
处理程序:
@Component
internal class SkillHandler(val service: SkillService) {
fun findAll(request: ServerRequest): Mono<ServerResponse> {
return ok().body(service.findAll())
}
fun create(request: ServerRequest): Mono<ServerResponse> {
return request.bodyToMono<Skill>()
.flatMap {
service.create(it).flatMap { skill ->
ok().body(skill.toMono())
.switchIfEmpty(badRequest().build())
}
}
}
服务层(关系“层次结构”只是关系的第一个测试):
internal class SkillService(val repo: SkillRepository) {
fun findAll() = repo.findAll()
fun create(skillRequest: Skill): Mono<Skill> {
val skill2 = Skill(
null,UUID.randomUUID(),mapOf("en" to setOf("english description")),emptySet()
)
val hierarchy: Set<Hierarchy> = setOf(Hierarchy(null,skill2))
val saveSkill: Skill = skillRequest.copy(uuid = UUID.randomUUID(),hierarchy = hierarchy)
return repo.save(saveSkill)
我在查看数据库浏览器上存储的信息时注意到的是,地图存储在属性下,这不应该是这种情况。
{
"identity": 12,"labels": [
"Skill"
],"properties": {
"description.en": [
"english description 2","english description 1"
],"uuid": "2e7924c1-6e53-4faa-be93-8081107279f5"
}
}
记录实际上应该是这样的:
{
"uuid": "eeaacee9-782a-42e9-b5a2-5bf2b837addc","description": {
"en": [
"english description 2","english description 1"
]
但是,当通过 rest 端点检索数据时,我收到以下错误消息。
"status": 500,"error": "Internal Server Error","message": "JSON encoding error: class org.neo4j.driver.internal.value.StringValue cannot be cast to class java.lang.String (org.neo4j.driver.internal.value.StringValue is in unnamed module of loader 'app'; java.lang.String is in module java.base of loader 'bootstrap'); nested exception is com.fasterxml.jackson.databind.JsonMappingException: class org.neo4j.driver.internal.value.StringValue cannot be cast to class java.lang.String (org.neo4j.driver.internal.value.StringValue is in unnamed module of loader 'app'; java.lang.String is in module java.base of loader 'bootstrap') (through reference chain: java.util.ArrayList[0]->com.test.skill.entity.Skill[\"description\"]->java.util.HashMap[\"en\"]->java.util.LinkedHashSet[0])",
我的猜测是我需要 Neo4jPersistentPropertyToMapConverter 接口。我的这个假设是否正确,具体实现方式如何?
非常感谢。
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