grails - 在 Elasticsearch Grails 中解码域类错误

Question

我正在尝试在 Grails 3.1.6 中使用 ElasticSearch 1.0.0.2。

域类是:

class Post {

String content
Date dateCreated

static belongsTo = [user: User]

static hasMany = [tags: Tag]

static searchable = {
    tags component : true
    user component: true
}
}

我在我的 SearchController 中注入(inject)了 ElasticSearchService 并尝试获取搜索结果:

try {
            def searchResult = elasticSearchService.search("${params.q}")
//            def searchResult = Post.search("${params.q}")
            println("search result: "+searchResult)
            return [searchResult: searchResult]
        }catch (e){
            println e.message
            return [searchError: true]
        }

但是得到这样的错误:

 ERROR grails.plugins.elasticsearch.conversion.unmarshall.DomainClassUnmarshaller - Error unmarshalling property 'user' of Class Post with id 4
java.lang.IllegalStateException: Property Post.user is not mapped as [component], but broken search hit found.
    at sun.reflect.GeneratedConstructorAccessor116.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at org.springsource.loaded.ri.ReflectiveInterceptor.jlrConstructorNewInstance(ReflectiveInterceptor.java:1075)
    at org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:83)
    at org.codehaus.groovy.reflection.CachedConstructor.doConstructorInvoke(CachedConstructor.java:77)
    at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrap.callConstructor(ConstructorSite.java:84)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:247)
    at grails.plugins.elasticsearch.conversion.unmarshall.DomainClassUnmarshaller.unmarshallProperty(DomainClassUnmarshaller.groovy:206)
    at sun.reflect.GeneratedMethodAccessor339.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1432)
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:210)
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:59)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:64)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:190)

有人可以告诉我我犯了什么错误。谢谢。

Answer 1

有同样的问题，使用 elastisearch 插件文档中的这篇文章将我的组件更改为解决了我的问题的引用:

3.8.1.可搜索引用
searchable-reference 映射模式是用于关联的默认模式，并且要求关联的可搜索类进行根映射以便拥有自己的索引。使用此模式，关联的域不会完全编码在生成的 JSON 文档中:仅保留实例的 id 和类型。当从索引中检索文档时，插件将使用存储的 id 从索引中自动重建关联。

示例

class MyDomain {
 // odom is an association with the OtherDomain class, set as a   reference
 OtherDomain odom

   static searchable = {
      odom reference:true
   }
 }

// The OtherDomain definition, with default searchable
 class OtherDomain {
    static searchable = true

     String field1 = "val1"
     String field2 = "val2"
     String field3 = "val3"
     String field4 = "val4"
 }

在索引 MyDomain 实例时，生成的 JSON 文档将被发送到 ElasticSearch:

{
    "mydomain": {
        "_id":1,
        "odom": { "id":1 }
    }
}

{
    "otherdomain": {
        "_id":1,
        "field1":"val1",
        "field2":"val2",
        "field3":"val3",
        "field4":"val4"
    }
}

这是文档的链接
http://noamt.github.io/elasticsearch-grails-plugin/docs/index.html#searchableComponentReference