带有@cypher模式指令的自定义解析器不接受将日期作为输入- GRANDStack。

Question

我正在尝试在我的大堆栈应用程序中添加自定义解析器。在那里，当我将DateInput传递给我的突变时，我得到了一个错误。

这是我的模式：

type Registration @hasRole(roles: [admin]) {
  registrationId: ID!
  startDate: Date!
  endDate: Date
}
type Mutation {
CreateRegistration(startDate: Date!, endDate: Date): Registration
    @cypher(
      statement: """
      CREATE (registration: Registration {
                              registrationId: apoc.create.uuid(),
                              startDate: $startDate,
                              endDate: $endDate
                            })
      RETURN registration
      """
    )
}

这是我的突变，我在GraphQL操场上使用：

mutation CreateRegistration {
  CreateRegistration(
    startDate: { year: 2020, month: 3, day: 22 }
    endDate: { year: 2020, month: 4, day: 12 }
  ) {
    registrationId
    startDate {
      formatted
    }
  }
}

这是由neo4j-graphql包自动生成的突变：

20:49:51 api | 2020-11-29T19:49:51.949Z neo4j-graphql-js CALL apoc.cypher.doIt("CREATE (registration: Registration {registrationId: apoc.create.uuid(), startDate: $startDate, endDate: $endDate})
20:49:51 api | RETURN registration", {startDate:$startDate, endDate:$endDate, first:$first, offset:$offset}) YIELD value
20:49:51 api |     WITH apoc.map.values(value, [keys(value)[0]])[0] AS `registration`
20:49:51 api |     RETURN `registration` { .registrationId ,startDate: { formatted: toString(`registration`.startDate) }} AS `registration`
20:49:51 api | 2020-11-29T19:49:51.949Z neo4j-graphql-js {
20:49:51 api |   "startDate": {
20:49:51 api |     "year": 2020,
20:49:51 api |     "month": 3,
20:49:51 api |     "day": 22
20:49:51 api |   },
20:49:51 api |   "endDate": {
20:49:51 api |     "year": 2020,
20:49:51 api |     "month": 4,
20:49:51 api |     "day": 12
20:49:51 api |   },
20:49:51 api |   "first": -1,
20:49:51 api |   "offset": 0
20:49:51 api | }

这就是我得到的错误反应：

{
  "errors": [
    {
      "message": "Failed to invoke procedure `apoc.cypher.doIt`: Caused by: org.neo4j.exceptions.CypherTypeException: Property values can only be of primitive types or arrays thereof",

当我只使用没有@cypher的自动生成的Resolver时，它工作得非常完美。

它看起来是my date对象的输入值出现了问题。当我完全删除日期时，它也能工作。

有人有什么建议吗，我做错了什么？

THX

Answer 1

当我使用“格式化”版本时，它可以工作：

type Mutation {
CreateRegistration(startDate: Date!, endDate: Date): Registration
    @cypher(
      statement: """
      CREATE (registration: Registration {
                              registrationId: apoc.create.uuid(),
                              startDate: date($startDate.formatted),
                              endDate: date($endDate.formatted)
                            })
      RETURN registration
      """
    )
}

突变的地方必须：

mutation CreateRegistration {
  CreateRegistration(
    startDate: { formatted: "2020-3-22" }
    endDate: { formatted: "2020-6-22" }
  ) {
    registrationId
    startDate {
      formatted
    }
  }
}

Answer 2

问题是，您将对象作为startDate和endDate属性的值传递，neo4j不支持这些属性。

例如，可以使用date函数将对象转换为合适的类型：

type Mutation {
CreateRegistration(startDate: Date!, endDate: Date): Registration
    @cypher(
      statement: """
      CREATE (registration: Registration {
                              registrationId: apoc.create.uuid(),
                              startDate: date($startDate),
                              endDate: date($endDate)
                            })
      RETURN registration
      """
    )
}