Scala 如何从avro4s 3.0.4迁移到4.0.0-RC2?
如何从avro4s 3.0.4迁移到4.0.0-RC2? 我有以下编译错误:Scala 如何从avro4s 3.0.4迁移到4.0.0-RC2?,scala,avro,avro4s,Scala,Avro,Avro4s,如何从avro4s 3.0.4迁移到4.0.0-RC2? 我有以下编译错误: [error] /Users/nicolae.marasoiu/proj/data-availability-global-topic-conveyor/src/main/scala/com/ovoenergy/globaltopics/serdes/AvroFormatImplicits.scala:8:15: value const is not a member of object com.sksamuel.av
[error] /Users/nicolae.marasoiu/proj/data-availability-global-topic-conveyor/src/main/scala/com/ovoenergy/globaltopics/serdes/AvroFormatImplicits.scala:8:15: value const is not a member of object com.sksamuel.avro4s.SchemaFor
[error] SchemaFor.const(new Schema.Parser().parse(getClass.getResourceAsStream(hasSchema.resourcePath)))
[error] ^
[error] /Users/nicolae.marasoiu/proj/data-availability-global-topic-conveyor/src/main/scala/com/ovoenergy/globaltopics/serdes/AvroFormatImplicits.scala:11:26: not enough arguments for method apply: (implicit evidence$1: com.sksamuel.avro4s.Encoder[T], implicit evidence$2: com.sksamuel.avro4s.Decoder[T])com.sksamuel.avro4s.RecordFormat[T] in object RecordFormat.
[error] Unspecified value parameter evidence$2.
[error] RecordFormat.apply[T](AvroSchema[T](readSchema))
[error] ^
[error] /Users/nicolae.marasoiu/proj/data-availability-global-topic-conveyor/src/main/scala/com/ovoenergy/globaltopics/serdes/SerdeProvider.scala:29:37: org.apache.avro.Schema does not take parameters
[error] val schema = SchemaFor[T].schema(DefaultFieldMapper)
[error] ^
[error] /Users/nicolae.marasoiu/proj/data-availability-global-topic-conveyor/src/main/scala/com/ovoenergy/globaltopics/serdes/SerdeProvider.scala:37:70: no arguments allowed for nullary method build: ()com.sksamuel.avro4s.AvroOutputStream[T]
[error] val os = AvroOutputStream.binary[T].to(output).build(schema)
[error] ^
[error] four errors found
[error] (Compile / compileIncremental) Compilation failed
[error] Total time: 17 s, completed 28-Jul-2020 19:42:21
[IJ]sbt:global-topic-conveyor>
首先,您可以随时跟踪更改。此外,您可以看到 您没有附加任何源代码,因此我将尝试解决您的失败,因为我可以从您的失败中理解它们
SchemaFor.const
已在3.0.5版中删除。你可以在照片上看到。假设您有Schema s
,并且您已经启动了SchemaFor.const
,现在您需要启动它:SchemaFor(s)
。将使用默认的fieldMapper。你可以看到RecordFormat.apply[T](AvroSchema[T](readSchema))
的类型T,则需要将其更改为:RecordFormat[T]
SchemaFor.schema
。相反,您可以只执行以下操作:SchemaFor[T].schema
。不再接受参数,因此不能用括号调用它AvroOutputStream.build
用于将架构作为参数。再也受不了了。您需要将AvroOutputStream.binary[T].to(output).build(schema)
更改为:AvroOutputStream.binary[T].to(output).build()
能否添加一个要迁移的代码段?