如何解决使用 circe
我有一个 json 字符串，它是一个 json 对象列表，每个 json 都有几个嵌入的对象；主要问题在
custom_fields
，这个字段是一个列表，它可以有多种类型的对象；我在此页面 https://immutables.pl/2017/02/25/customizing-circes-auto-generic-derivation/ 上找到了一个示例，但我对 circe 和 shapeless 没有太多经验，当我尝试进行解码时，它向我发送了此异常：
Left(DecodingFailure(CNil,List(DownArray,DownField(custom_fields),DownArray,DownField(tasks))))
解码的代码库：
import io.circe
import io.circe.generic.extras.{AutoDerivation,Configuration}
import io.circe.generic.semiauto.{deriveDecoder,deriveEncoder}
import io.circe.{Decoder,Encoder}
object ADT extends App {
val json =
"""
| {
| "tasks": [
| {
| "id": "xxxxxxx",| "custom_id": null,| "name": "xxxxxxxxxxxxxxxxx",| "text_content": null,| "description": null,| "status": {
| "status": "Closed",| "color": "#6bc950",| "type": "closed",| "orderindex": 3
| },| "orderindex": "247.00000000000000000000000000000000",| "date_created": "1581725281039",| "date_updated": "1587696872148",| "date_closed": "1583380816440",| "archived": false,| "creator": {
| "id": 4374599,| "username": "name xxxxxxx",| "color": "#006063",| "email": "xxxx@xxx.com",| "profilePicture": "https://xxxxxxxx.jpg"
| },| "assignees": [
| {
| "id": 000000,| "username": "xxxxx",| "color": "#81b1ff",| "initials": "xx",| "email": "xxxxx@xxxxxxx.com",| "profilePicture": "https://xxxxxxx.jpg"
| }
| ],| "watchers": [
|
| ],| "checklists": [
|
| ],| "tags": [
|
| ],| "parent": null,| "priority": null,| "due_date": null,| "start_date": null,| "points": null,| "time_estimate": null,|
| "custom_fields": [
| {
| "id": "d0c016df-e09a-492e-a7a2-cc92e1993627",| "name": "Sprint",| "type": "labels",| "type_config": {
| "options": [
| {
| "id": "64e19188-8440-4b35-8459-d49348c92e55",| "label": "2021w14",| "color": "#e50000"
| },| {
| "id": "f71958f7-1c87-484e-8857-c2f90ef80f69",| "label": "2021w13",| "color": "#2ecd6f"
| },| {
| "id": "a7f835c8-76fe-42e9-85a9-50a8af8dd6ea",| "label": "2021w12",| "color": "#fff"
| },| {
| "id": "aaf2fcc6-ec8d-4eb8-8621-cac2c8063f17",| "label": "2021w11",| "color": "#fff"
| }
| ]
| },| "date_created": "xxxxxxxxxxxx",| "hide_from_guests": false,| "value": [
| "64e19188-8440-4b35-8459-d49348c92e55"
| ],| "required": false
| },| {
| "id": "4513e77f-9866-4139-bcc5-458945db0deb",| "name": "Points",| "type": "drop_down",| "type_config": {
| "new_drop_down": true,| "options": [
| {
| "id": "02b60555-6814-4bfa-9a4a-3c5728261f9b",| "name": "1",| "color": null,| "orderindex": 0
| },| {
| "id": "d7fce482-c1d2-4732-a6f9-4268c447c4b7",| "name": "2",| "orderindex": 1
| },| {
| "id": "b7b99b87-7639-4286-8e6f-96966718ff1f",| "name": "3",| "orderindex": 2
| }
| ]
| },| "date_created": "xxxxxxxxxxxxxxxxxxxxxxxxxx",| {
| "id": "xxxxxx_xxxxxx_xxxxxxx_xxxxx",| "name": "Progreso",| "type": "xxxxxxxxxxxxxxxxx",| "type_config": {
| "tracking": {
| "checklists": true,| "assigned_comments": true
| },| "complete_on": 3
| },| "date_created": "xxxxxxxxxxxxxxxxxxxxx",| "value": {
| "percent_complete": 100
| },| "required": null
| }
| ],|
| "dependencies": [
|
| ],| "linked_tasks": [
|
| ],| "team_id": "xxxxxxxx",| "url": "xxxxxxxxxx",| "permission_level": "create",| "list": {
| "id": "xxxxxxxxx",| "name": "xxxxxxx 02-06",| "access": true
| },| "project": {
| "id": "xxxxxxxxx",| "name": "Sprints",| "hidden": false,| "folder": {
| "id": "xxxxxxxxx",| "space": {
| "id": "4286586"
| }
|}
| ]
| }
|""".stripMargin
object codecs {
import auto._
implicit val movieEncoder: Encoder[TasksItem] = deriveEncoder[TasksItem]
implicit val movieDecoder: Decoder[TasksItem] = deriveDecoder[TasksItem]
}
private object auto extends AutoDerivation {
import shapeless._
// list value
implicit def encoderValueClass[T <: AnyVal,V](implicit
g: Lazy[Generic.Aux[T,V :: HNil]],e: Encoder[V]
): Encoder[T] = Encoder.instance { element ⇒
e(g.value.to(element).head)
}
implicit def decoderValueClass[T <: AnyVal,d: Decoder[V]
): Decoder[T] = Decoder.instance { cursor ⇒
d(cursor).map { element ⇒
g.value.from(element :: HNil)
}
}
implicit val configuration: Configuration = Configuration.default.withdiscriminator("type")
}
import codecs._
val decoded:Either[circe.Error,TasksItem] = circe.jawn.decode[TasksItem](json)
println(decoded)
}
案例类代码：
case class ValueSprint(value:Option[List[String]]=None ) extends AnyVal
case class ValueStoryPoint(value:Option[Int]=None ) extends AnyVal
case class ValueStoryProgreso(value:Option[Int]=None ) extends AnyVal
case class ValueItem( percent_complete:ValueStoryProgreso )
sealed trait ElementTask
case class CustomFieldsItemSprint( id:Option[String]=None,name:Option[String]=None,`type`:Option[String]=None,date_created:Option[String]=None,hide_from_guests:Option[Boolean]=None,value:ValueSprint,required:Option[Boolean]=None ) extends ElementTask
case class CustomFieldsItemStoryPoint ( id:Option[String]=None,value: ValueStoryPoint,required:Option[Boolean]=None ) extends ElementTask
case class CustomFieldsItemProgreso ( id:Option[String]=None,value:Option[ValueItem]=None,required:Option[Boolean]=None ) extends ElementTask
case class SpaceItem(id:Option[String]=None)
case class FolderItem( id: Option[String]=None,hidden:Option[Boolean]=None,access:Option[Boolean]=None)
case class ProjectItem( id: Option[String]=None,access:Option[Boolean]=None)
case class ListItem( id:Option[String]=None,access:Option[Boolean]=None )
case class TagsItem (name:Option[String]=None,tag_fg: Option[String]=None,tag_bg:Option[String]=None,creator: Option[Long]=None)
case class AssigneesItem( id:Option[Long]=None,username:Option[String]=None,color:Option[String]=None,initials:Option[String]=None,email: Option[String]=None,profilePicture: Option[String]=None)
case class CreatorItem( id:Option[Long]=None,email:Option[String]=None,profilePicture:Option[String]=None )
case class StatusItem( status:Option[String]=None,orderindex:Option[Int]=None)
case class DependenciesItem( task_id:Option[String]=None,depends_on:Option[String]=None,`type`:Option[Int],userid:Option[String]=None)
case class PriorityItem( id:Option[String]=None,priority:Option[String]=None,orderindex:Option[String]=None)
case class OptionsItem(id:Option[String]=None,label:Option[String]=None,orderindex:Option[Int]=None )
case class TrackingItem(checklists:Option[Boolean],assigned_comments:Option[Boolean])
case class TypeConfigItem( new_drop_down:Option[Boolean]=None,options:Option[List[OptionsItem]]=None,complete_on:Option[Int],tracking:Option[TrackingItem] )
case class ChecklistsItem( id:Option[String]=None,task_id:Option[String]=None,orderindex:Option[Int]=None,creator:Option[Long]=None,resolved:Option[Int]=None,unresolved:Option[Int]=None )
case class TaskItem ( id:Option[String]=None,custom_id:Option[String]=None,text_content:Option[String]=None,description:Option[String]=None,status:Option[StatusItem]=None,orderindex:Option[String]=None,date_updated: Option[String]=None,date_closed:Option[String]=None,archived:Option[Boolean]=None,creator:Option[CreatorItem],assignees:Option[List[AssigneesItem]]=None,watchers:Option[List[String]]=None,checklists:Option[List[ChecklistsItem]]=None,tags:Option[List[TagsItem]]=None,parent:Option[String]=None,priority:Option[PriorityItem]=None,due_date:Option[String]=None,start_date:Option[String]=None,points:Option[String]=None,time_estimate:Option[Long]=None,time_spent:Option[Long]=None,custom_fields:Option[List[ElementTask] ]=None,dependencies:Option[List[DependenciesItem]]=None,linked_tasks:Option[List[String]]=None,team_id:Option[String]=None,url:Option[String]=None,permission_level:Option[String]=None,list:Option[ListItem]=None,project:Option[ProjectItem]=None,folder:Option[FolderItem]=None,space:Option[SpaceItem]=None )
case class TasksItem ( tasks:Option[List[TaskItem]]=None ) // main case class
此字段失败：custom_fields:Option[List[ElementTask] ]=None,
我需要修改什么或缺少什么才能使其正常工作？
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