我的数据模型在TICKETS表和PLATES表之间有多对一的关系。我使用AWS Amplify GUI构建了这个模型，并将生成的源代码下载到我的Xcode项目中。对于我的数据模型中存在的关系，Xcode在Swift模式文件的PLATES表的这一行中抛出了几个错误：

model.fields(
      .id(),
      .field(pLATES.plateState, is: .optional, ofType: .string),
      .field(pLATES.plateNumber, is: .optional, ofType: .string),
      .field(pLATES.vehicleMake, is: .optional, ofType: .string),
      .field(pLATES.vehicleModel, is: .optional, ofType: .string),
      .field(pLATES.vehicleYear, is: .optional, ofType: .int),
      .field(pLATES.vehicleColor, is: .optional, ofType: .string),
      .hasMany(pLATES.TICKETS, is: .optional, ofType: TICKETS.self, associatedWith: TICKETS.keys.platesID),
      .field(pLATES.usersID, is: .optional, ofType: .string),
      .field(pLATES.createdAt, is: .optional, isReadOnly: true, ofType: .dateTime),
      .field(pLATES.updatedAt, is: .optional, isReadOnly: true, ofType: .dateTime)
    )

.hasMany行上的所有错误：

• 无法将类型“List？”的值转换为所需的参数类型“Model.Type”
• 示例成员“TICKETS”不能用于类型“PLATES”;是否要使用此类型值？
• 类型'List？'的值没有成员'keys'

基于Amplify文档，后端的GraphQL文件似乎结构正确：

type TICKETS @model @auth(rules: [{allow: public}]) @key(name: "byPLATES", fields: ["platesID"]) {
  id: ID!
  ticketID: Int
  reasonCode: Int
  ticketDateTime: AWSDateTime
  ticketLocationLong: Float
  ticketLocationLat: Float
  platesID: ID
  USERS: USERS @connection
}

type PLATES @model @auth(rules: [{allow: public}]) @key(name: "byUSERS", fields: ["usersID"]) {
  id: ID!
  plateState: String
  plateNumber: String
  vehicleMake: String
  vehicleModel: String
  vehicleYear: Int
  vehicleColor: String
  TICKETS: [TICKETS] @connection(keyName: "byPLATES", fields: ["id"])
  usersID: ID
}

我如何纠正这些错误？