我正在尝试在 mongo db 集合中获取一行,该集合具有一个对象 id 数组,该数组是其他集合中数据行的 ObjectID。我想为当前集合中的每条数据记录从集合中获取填充的数据行数组。
我的收藏是这样的
工作 - ObjectID - [ObjectIds(候选人的对象 ID)]
候选人 -ObjectID -姓名 -年龄
我在用
import org.springframework.data.mongodb.core.mapping.DBRef;
在我的模型类中指示参考。
@Document(collection = "jobcreations")
public class Job {
@Id
private String id;
@DBRef
private List<Candidate> _candidates;
private String jobID;
public String getjobID() {
return jobID;
}
public void setjobID(String jobid) {
this.jobID = jobid;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public JobCreation() {
super();
}
public List<Candidate> get_candidates() {
return _candidates;
}
public void set_candidates(List<Candidate> _candidates) {
this._candidates = _candidates;
}
public JobCreation(String jobID) {
super();
this.jobID = jobID;
}
@Override
public String toString() {
return "JobCreation [id=" + id + ", _candidates=" + _candidates + ", jobID=" + jobID + "]";
}
}
我的候选模型类是这样的
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
@Document(collection = "candidate")
public class Candidate {
@Id
private String _id;
private String name;
private int age;
public String get_id() {
return _id;
}
public void set_id(String _id) {
this._id = _id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the age
*/
public String getAge() {
return age;
}
/**
* @param age the age to set
*/
public void setAge(int age) {
this.age = age;
}
public Candidate() {
super();
// TODO Auto-generated constructor stub
}
}
我调用数据库的主要方法是
ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringMongoConfig.class);
MongoOperations mongoOperation = (MongoOperations) ctx.getBean("mongoTemplate");
List<JobCreation> listJobCreation = mongoOperation.findAll(JobCreation.class);
for(JobCreation jc : listJobCreation){
System.out.println(jc.toString());
}
在这里我收到错误
Exception in thread "main" org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type org.bson.types.ObjectId to type com.mkyong.model.CandidateProfile
at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:276)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:172)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:154)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getPotentiallyConvertedSimpleRead(MappingMongoConverter.java:673)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readCollectionOrArray(MappingMongoConverter.java:751)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1006)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.access$100(MappingMongoConverter.java:75)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:957)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getValueInternal(MappingMongoConverter.java:713)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$2.doWithAssociation(MappingMongoConverter.java:257)
at org.springframework.data.mapping.model.BasicPersistentEntity.doWithAssociations(BasicPersistentEntity.java:252)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:254)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:212)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:176)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:172)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:75)
at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:1840)
at org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:1536)
at org.springframework.data.mongodb.core.MongoTemplate.findAll(MongoTemplate.java:1057)
at com.mkyong.core.App.main(App.java:29)
请帮助我如何解决此错误。
提前致谢