У меня есть User
Как вставить объект в документ MongoDB 3.2?
public class User {
private String name;
private String email;
public User() { }
public User(String name) {
this.name = name;
}
public User(String name, String email) {
this(name);
this.email = email;
}
// getters and setters
}
Также у меня есть простой POJO Comment
public class Comment {
private String comment;
private Date date;
private String author;
public Comment() { }
public Comment(String comment, Date date, String author) {
this.comment = comment;
this.date = date;
this.author = author;
}
// getters and setters
}
Как я хочу вставить новый пользователь в коллекцию с каким-то комментарии о нем, как это:
public static void main(String[] args) {
MongoClient client = new MongoClient();
MongoDatabase db = client.getDatabase("example");
MongoCollection<Document> collection = db.getCollection("object_arrays");
collection.drop();
List<Comment> reviews = new ArrayList<Comment>(){{
add(new Comment("cool guy", new Date(), "John Doe"));
add(new Comment("best joker", new Date(), "Vas Negas"));
add(new Comment("very stupid but very funny man", new Date(), "Bill Murphy"));
}};
Document user = new Document();
user.append("user", new User("0xFF", "[email protected]"))
.append("reviews", reviews)
.append("createDate", new Date());
collection.insertOne(user);
}
К сожалению, у меня есть Исключение:
Exception in thread "main" org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class com.mongodb.course.com.mongodb.course.model.User.
at org.bson.codecs.configuration.CodecCache.getOrThrow(CodecCache.java:46)
at org.bson.codecs.configuration.ProvidersCodecRegistry.get(ProvidersCodecRegistry.java:63)
at org.bson.codecs.configuration.ChildCodecRegistry.get(ChildCodecRegistry.java:51)
at org.bson.codecs.DocumentCodec.writeValue(DocumentCodec.java:174)
at org.bson.codecs.DocumentCodec.writeMap(DocumentCodec.java:189)
at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:131)
at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:45)
at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:63)
at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:29)
at com.mongodb.connection.InsertCommandMessage.writeTheWrites(InsertCommandMessage.java:101)
at com.mongodb.connection.InsertCommandMessage.writeTheWrites(InsertCommandMessage.java:43)
at com.mongodb.connection.BaseWriteCommandMessage.encodeMessageBodyWithMetadata(BaseWriteCommandMessage.java:129)
at com.mongodb.connection.RequestMessage.encodeWithMetadata(RequestMessage.java:160)
at com.mongodb.connection.WriteCommandProtocol.sendMessage(WriteCommandProtocol.java:212)
at com.mongodb.connection.WriteCommandProtocol.execute(WriteCommandProtocol.java:101)
at com.mongodb.connection.InsertCommandProtocol.execute(InsertCommandProtocol.java:67)
at com.mongodb.connection.InsertCommandProtocol.execute(InsertCommandProtocol.java:37)
at com.mongodb.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:159)
at com.mongodb.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:286)
at com.mongodb.connection.DefaultServerConnection.insertCommand(DefaultServerConnection.java:115)
at com.mongodb.operation.MixedBulkWriteOperation$Run$2.executeWriteCommandProtocol(MixedBulkWriteOperation.java:455)
at com.mongodb.operation.MixedBulkWriteOperation$Run$RunExecutor.execute(MixedBulkWriteOperation.java:646)
at com.mongodb.operation.MixedBulkWriteOperation$Run.execute(MixedBulkWriteOperation.java:401)
at com.mongodb.operation.MixedBulkWriteOperation$1.call(MixedBulkWriteOperation.java:179)
at com.mongodb.operation.MixedBulkWriteOperation$1.call(MixedBulkWriteOperation.java:168)
at com.mongodb.operation.OperationHelper.withConnectionSource(OperationHelper.java:230)
at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:221)
at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:168)
at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:74)
at com.mongodb.Mongo.execute(Mongo.java:781)
at com.mongodb.Mongo$2.execute(Mongo.java:764)
at com.mongodb.MongoCollectionImpl.executeSingleWriteRequest(MongoCollectionImpl.java:515)
at com.mongodb.MongoCollectionImpl.insertOne(MongoCollectionImpl.java:306)
at com.mongodb.MongoCollectionImpl.insertOne(MongoCollectionImpl.java:297)
at com.mongodb.course.week3.ArrayListWithObject.main(ArrayListWithObject.java:34)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Я понимаю, что драйвер Java для MongoDB не может преобразовать мой объект в Document
и он хочет какой-то конвертер. Также я знаю около Codec
, CodecRegistry
и CodecProvider
интерфейсов. Кстати, есть ли более простой способ конвертировать объект в документ mongo? Можете ли вы показать мне пример, как я могу это сделать? Спасибо.