graphql - 切换到 graphql 15.5.1 后返回空数组会导致“无法返回空值”错误
问题描述
编辑:您可以跳到最后以获取代码和框中错误的简化示例
我正在将我的 apollo 项目升级到新版本的 graphql,但我遇到了一个奇怪的错误。在 google 上找不到与此方案匹配的任何结果。当我尝试返回具有不可为空字段(包括日期)的 ObjectTypes DrivingActivitiesDailySummaryType 的空数组时,它会抛出“不能为不可为空的字段 DrivingActivitiesDailySummaryType.day 返回 null。”。这在版本 14.7.0 中按预期工作。这里发生了什么事?如何避免?我认为正常的行为是允许空数组,我在更改日志中找不到任何表明这种类型更改的内容。
我的解析器目前只返回一个硬编码值进行测试:
@Query(() => DrivingActivityPayload)
public async totalDrivingActivity(
@Ctx("user") userContext: UserContext,
@Args() input: DrivingActivitiesQueryInput
): Promise<DrivingActivityPayload> {
return {
totalSummary: { speed: 1, activities: 1, duration: 1, distance: 1 },
dailySummaries: [],
monthlySummaries: [],
}
}
我的有效载荷定义:
@ObjectType()
export class DrivingActivityPayload {
@Field(() => DrivingActivitiesTotalSummaryType)
public totalSummary: DrivingActivitiesTotalSummaryType
@Field(() => DrivingActivitiesDailySummaryType)
public dailySummaries: DrivingActivitiesDailySummaryType[]
@Field(() => DrivingActivitiesMonthlySummaryType)
public monthlySummaries: DrivingActivitiesMonthlySummaryType[]
constructor(
totalSummary: DrivingActivitiesTotalSummaryType,
dailySummaries: DrivingActivitiesDailySummaryType[],
monthlySummaries: DrivingActivitiesMonthlySummaryType[]
) {
this.totalSummary = new DrivingActivitiesTotalSummaryType(totalSummary)
this.dailySummaries = dailySummaries.map(summary => new DrivingActivitiesDailySummaryType(summary))
this.monthlySummaries = monthlySummaries.map(summary => new DrivingActivitiesMonthlySummaryType(summary))
}
}
GraphQL 错误:
"errors": [
{
"message": "Cannot return null for non-nullable field DrivingActivitiesDailySummaryType.day.",
"locations": [
{
"line": 18,
"column": 7
}
],
"path": [
"totalDrivingActivity",
"dailySummaries",
"day"
],
"extensions": {
"code": "INTERNAL_SERVER_ERROR",
"exception": {
"stacktrace": [
"Error: Cannot return null for non-nullable field DrivingActivitiesDailySummaryType.day.",
" at completeValue ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:559:13)",
" at resolveField ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:472:19)",
" at executeFields ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:292:18)",
" at collectAndExecuteSubfields ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:748:10)",
" at completeObjectValue ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:738:10)",
" at completeValue ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:590:12)",
" at completeValue ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:556:21)",
" at resolveField ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:472:19)",
" at executeFields ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:292:18)",
" at collectAndExecuteSubfields ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:748:10)",
" at completeObjectValue ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:738:10)",
" at completeValue ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:590:12)",
" at completeValue ([PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:556:21)",
" at [PROJECT-FOLDER]/node_modules/graphql/execution/execute.js:469:16",
" at processTicksAndRejections (node:internal/process/task_queues:96:5)",
" at async Promise.all (index 0)"
]
}
}
}
],
"data": null
}
DrivingActivitiesDailySummaryType 定义(尽管这无关紧要):
@ObjectType()
export class DrivingActivitiesDailySummaryType {
@Field(() => Date)
public day: Date
@Field()
public distance: number
@Field()
public activities: number
constructor(summary: DrivingActivitiesDailySummaryType) {
this.day = summary.day
this.activities = summary.activities
this.distance = summary.distance
}
}
编辑:这是一个带有重现错误的沙盒链接: https ://codesandbox.io/s/heuristic-jepsen-5frr3?file=/package.json (我不知道如何更改默认终端行为,所以你会必须使用“+”图标打开一个新终端并运行“npm start”)使用提供的 package.json(带有新版本)时,当您使用 package-old 切换 package.json 的内容时,会重现错误。 json(旧版本的 graphql 和 type-graphql)没有错误。
EDIT2:您可能需要将“/graphql”添加到代码框链接才能正常工作
解决方案
您应该将每日和每月摘要定义为数组:
@Field(() => [DrivingActivitiesDailySummaryType])
public dailySummaries: DrivingActivitiesDailySummaryType[]
@Field(() => [DrivingActivitiesMonthlySummaryType])
public monthlySummaries: DrivingActivitiesMonthlySummaryType[]
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