У меня возникла проблема в моем проекте с комбинацией Kotlin, SpringBoot 2.0 и MongoDB (с данными Spring) с @Transient. Прежде всего, вот как я объявил свои классы данных
@Document data class Child(@Id val id: String?, val name: String)
@Document data class Parent(@Id val id: String?, val child: Child? = null, val childId: String)
Я понимаю, что может быть лучший способ сослаться на Child из Parent, но MongoDB уже существует.
Проблема здесь в том, что я не хочу сохранять свойство child внутри Parent, поэтому я попытался аннотировать свойство с помощью kotlin.jvm.Transient, или org.springframework.data.annotation.Transient, или обоих. Но никакая комбинация, кажется, не решает мою проблему. Проблема, с которой я сталкиваюсь:
- Когда я использую
kotlin.jvm.Transient, он загружается, но когда я сохраняю его, он сохраняет свойство child вместе с ним
- Когда я использую
org.springframework.data.annotation.Transient, он не может прочитать с помощью трассировки стека:
org.springframework.data.mapping.MappingException: No property child found on entity class com.example.sample.domain.Parent to bind constructor parameter to!
at org.springframework.data.mapping.model.PersistentEntityParameterValueProvider.getParameterValue(PersistentEntityParameterValueProvider.java:68)
at org.springframework.data.mapping.model.SpELExpressionParameterValueProvider.getParameterValue(SpELExpressionParameterValueProvider.java:49)
at org.springframework.data.convert.ClassGeneratingEntityInstantiator$EntityInstantiatorAdapter.extractInvocationArguments(ClassGeneratingEntityInstantiator.java:250)
at org.springframework.data.convert.ClassGeneratingEntityInstantiator$EntityInstantiatorAdapter.createInstance(ClassGeneratingEntityInstantiator.java:223)
at org.springframework.data.convert.ClassGeneratingEntityInstantiator.createInstance(ClassGeneratingEntityInstantiator.java:84)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:272)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:245)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:194)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:190)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:78)
at org.springframework.data.mongodb.core.ReactiveMongoTemplate$ReadDocumentCallback.doWith(ReactiveMongoTemplate.java:2920)
at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:100)
at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76)
at com.mongodb.reactivestreams.client.internal.ObservableToPublisher$1.onNext(ObservableToPublisher.java:68)
at com.mongodb.async.client.AbstractSubscription.onNext(AbstractSubscription.java:135)
at com.mongodb.async.client.AbstractSubscription.processResultsQueue(AbstractSubscription.java:203)
at com.mongodb.async.client.AbstractSubscription.tryProcessResultsQueue(AbstractSubscription.java:159)
at com.mongodb.async.client.SingleResultCallbackSubscription$1.onResult(SingleResultCallbackSubscription.java:48)
at com.mongodb.async.client.FindIterableImpl$1$1.onResult(FindIterableImpl.java:213)
at com.mongodb.async.client.FindIterableImpl$1$1.onResult(FindIterableImpl.java:204)
at com.mongodb.operation.AsyncQueryBatchCursor.next(AsyncQueryBatchCursor.java:136)
at com.mongodb.operation.AsyncQueryBatchCursor.next(AsyncQueryBatchCursor.java:100)
at com.mongodb.async.client.FindIterableImpl$1.onResult(FindIterableImpl.java:204)
at com.mongodb.async.client.FindIterableImpl$1.onResult(FindIterableImpl.java:198)
at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:49)
at com.mongodb.async.client.OperationExecutorImpl$1$1.onResult(OperationExecutorImpl.java:82)
at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:49)
at com.mongodb.operation.FindOperation$3.onResult(FindOperation.java:806)
at com.mongodb.operation.OperationHelper$ReferenceCountedReleasingWrappedCallback.onResult(OperationHelper.java:364)
at com.mongodb.operation.CommandOperationHelper$2.onResult(CommandOperationHelper.java:405)
at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:49)
at com.mongodb.internal.connection.DefaultServer$DefaultServerProtocolExecutor$2.onResult(DefaultServer.java:227)
at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:49)
at com.mongodb.internal.connection.CommandProtocolImpl$1.onResult(CommandProtocolImpl.java:85)
at com.mongodb.internal.connection.DefaultConnectionPool$PooledConnection$1.onResult(DefaultConnectionPool.java:461)
at com.mongodb.internal.connection.UsageTrackingInternalConnection$2.onResult(UsageTrackingInternalConnection.java:111)
at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:49)
at com.mongodb.internal.connection.InternalStreamConnection$2$1.onResult(InternalStreamConnection.java:379)
at com.mongodb.internal.connection.InternalStreamConnection$2$1.onResult(InternalStreamConnection.java:356)
at com.mongodb.internal.connection.InternalStreamConnection$MessageHeaderCallback$MessageCallback.onResult(InternalStreamConnection.java:651)
at com.mongodb.internal.connection.InternalStreamConnection$MessageHeaderCallback$MessageCallback.onResult(InternalStreamConnection.java:618)
at com.mongodb.internal.connection.InternalStreamConnection$5.completed(InternalStreamConnection.java:494)
at com.mongodb.internal.connection.InternalStreamConnection$5.completed(InternalStreamConnection.java:491)
at com.mongodb.connection.netty.NettyStream.readAsync(NettyStream.java:236)
at com.mongodb.internal.connection.InternalStreamConnection.readAsync(InternalStreamConnection.java:491)
at com.mongodb.internal.connection.InternalStreamConnection.access$1000(InternalStreamConnection.java:74)
at com.mongodb.internal.connection.InternalStreamConnection$MessageHeaderCallback.onResult(InternalStreamConnection.java:608)
at com.mongodb.internal.connection.InternalStreamConnection$MessageHeaderCallback.onResult(InternalStreamConnection.java:593)
at com.mongodb.internal.connection.InternalStreamConnection$5.completed(InternalStreamConnection.java:494)
at com.mongodb.internal.connection.InternalStreamConnection$5.completed(InternalStreamConnection.java:491)
at com.mongodb.connection.netty.NettyStream.readAsync(NettyStream.java:236)
at com.mongodb.connection.netty.NettyStream.handleReadResponse(NettyStream.java:266)
at com.mongodb.connection.netty.NettyStream.access$600(NettyStream.java:66)
at com.mongodb.connection.netty.NettyStream$InboundBufferHandler.channelRead0(NettyStream.java:325)
at com.mongodb.connection.netty.NettyStream$InboundBufferHandler.channelRead0(NettyStream.java:322)
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:648)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:583)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:500)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:462)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:844)
- Когда я использую обе аннотации, это тот же результат, что и # 1 (очевидно), поскольку приложение читает данные, прежде чем пытаться выполнить некоторую логику.
Любая помощь очень ценится