TS 编译器错误：类型“字符串”不可分配给类型“状态”

Posted 2023-03-08

【中文标题】TS 编译器错误：类型“字符串”不可分配给类型“状态”

【英文标题】：TS compiler error: Type 'string' is not assignable to type 'Status'

【发布时间】：2018-10-01 21:16:19

【问题描述】：

我正在定义以下Query 对象：

export const Query = 

  // Feed
  feed(parent, args, ctx: Context, info) 
    const  filter, skip, first, orderBy  = args
    const where = filter
      ? 
          AND: [
             status: 'ACTIVE' ,
            
              OR: [
                 name_contains: filter ,
                 description_contains: filter 
              ]
            
          ]
        
      :  status: 'ACTIVE' 

    return ctx.db.query.listings( where, skip, first, orderBy , info)
  ,
  // ...

TS 编译器抱怨 status: 'ACTIVE' 部分：

[ts]
Argument of type ' where:  AND: ( status: string; OR?: undefined;  |  OR: ( name_contains: any; description_c...' is not assignable to parameter of type ' where?: ListingWhereInput; orderBy?: ListingOrderByInput; skip?: number; after?: string; before...'.
  Types of property 'where' are incompatible.
    Type ' AND: ( status: string; OR?: undefined;  |  OR: ( name_contains: any; description_contains?:...' is not assignable to type 'ListingWhereInput'.
      Type ' AND: ( status: string; OR?: undefined;  |  OR: ( name_contains: any; description_contains?:...' is not assignable to type 'ListingWhereInput'.
        Types of property 'AND' are incompatible.
          Type '( status: string; OR?: undefined;  |  OR: ( name_contains: any; description_contains?: undefi...' is not assignable to type 'ListingWhereInput | ListingWhereInput[]'.
            Type '( status: string; OR?: undefined;  |  OR: ( name_contains: any; description_contains?: undefi...' is not assignable to type 'ListingWhereInput[]'.
              Type ' status: string; OR?: undefined;  |  OR: ( name_contains: any; description_contains?: undefin...' is not assignable to type 'ListingWhereInput'.
                Type ' status: string; OR?: undefined; ' is not assignable to type 'ListingWhereInput'.
                  Types of property 'status' are incompatible.
                    Type 'string' is not assignable to type 'Status'.

请注意，Status 类型是基于 GraphQL SDL 中的 enum 自动生成的，如下所示：

enum Status 
  ACTIVE
  EXPIRED
  SOLD
  DELETED

生成的 TS 定义如下：

export type Status = 
  'ACTIVE' |
  'EXPIRED' |
  'SOLD' |
  'DELETED'

我不明白为什么 TS 编译器会抱怨 status: 'ACTIVE' 部分。根据我的理解，这应该是因为status 只能是四个定义的字符串值之一？！

更多信息：

如果有帮助，这里是其他相关类型的生成类型定义（一切都是基于 GraphQL SDL 生成的）：

export type Query = 
  listings: (args:  where?: ListingWhereInput, orderBy?: ListingOrderByInput, skip?: Int, after?: String, before?: String, first?: Int, last?: Int , info?: GraphQLResolveInfo | string) => Promise<Listing[]>
  // ... other fields


export interface ListingWhereInput 
  AND?: ListingWhereInput[] | ListingWhereInput
  OR?: ListingWhereInput[] | ListingWhereInput
  id?: ID_Input
  id_not?: ID_Input
  id_in?: ID_Input[] | ID_Input
  id_not_in?: ID_Input[] | ID_Input
  id_lt?: ID_Input
  id_lte?: ID_Input
  id_gt?: ID_Input
  id_gte?: ID_Input
  id_contains?: ID_Input
  id_not_contains?: ID_Input
  id_starts_with?: ID_Input
  id_not_starts_with?: ID_Input
  id_ends_with?: ID_Input
  id_not_ends_with?: ID_Input
  name?: String
  name_not?: String
  name_in?: String[] | String
  name_not_in?: String[] | String
  name_lt?: String
  name_lte?: String
  name_gt?: String
  name_gte?: String
  name_contains?: String
  name_not_contains?: String
  name_starts_with?: String
  name_not_starts_with?: String
  name_ends_with?: String
  name_not_ends_with?: String
  description?: String
  description_not?: String
  description_in?: String[] | String
  description_not_in?: String[] | String
  description_lt?: String
  description_lte?: String
  description_gt?: String
  description_gte?: String
  description_contains?: String
  description_not_contains?: String
  description_starts_with?: String
  description_not_starts_with?: String
  description_ends_with?: String
  description_not_ends_with?: String
  price?: Int
  price_not?: Int
  price_in?: Int[] | Int
  price_not_in?: Int[] | Int
  price_lt?: Int
  price_lte?: Int
  price_gt?: Int
  price_gte?: Int
  location?: String
  location_not?: String
  location_in?: String[] | String
  location_not_in?: String[] | String
  location_lt?: String
  location_lte?: String
  location_gt?: String
  location_gte?: String
  location_contains?: String
  location_not_contains?: String
  location_starts_with?: String
  location_not_starts_with?: String
  location_ends_with?: String
  location_not_ends_with?: String
  condition?: Condition
  condition_not?: Condition
  condition_in?: Condition[] | Condition
  condition_not_in?: Condition[] | Condition
  status?: Status
  status_not?: Status
  status_in?: Status[] | Status
  status_not_in?: Status[] | Status
  expiredAt?: DateTime
  expiredAt_not?: DateTime
  expiredAt_in?: DateTime[] | DateTime
  expiredAt_not_in?: DateTime[] | DateTime
  expiredAt_lt?: DateTime
  expiredAt_lte?: DateTime
  expiredAt_gt?: DateTime
  expiredAt_gte?: DateTime
  soldAt?: DateTime
  soldAt_not?: DateTime
  soldAt_in?: DateTime[] | DateTime
  soldAt_not_in?: DateTime[] | DateTime
  soldAt_lt?: DateTime
  soldAt_lte?: DateTime
  soldAt_gt?: DateTime
  soldAt_gte?: DateTime
  deletedAt?: DateTime
  deletedAt_not?: DateTime
  deletedAt_in?: DateTime[] | DateTime
  deletedAt_not_in?: DateTime[] | DateTime
  deletedAt_lt?: DateTime
  deletedAt_lte?: DateTime
  deletedAt_gt?: DateTime
  deletedAt_gte?: DateTime
  createdAt?: DateTime
  createdAt_not?: DateTime
  createdAt_in?: DateTime[] | DateTime
  createdAt_not_in?: DateTime[] | DateTime
  createdAt_lt?: DateTime
  createdAt_lte?: DateTime
  createdAt_gt?: DateTime
  createdAt_gte?: DateTime
  updatedAt?: DateTime
  updatedAt_not?: DateTime
  updatedAt_in?: DateTime[] | DateTime
  updatedAt_not_in?: DateTime[] | DateTime
  updatedAt_lt?: DateTime
  updatedAt_lte?: DateTime
  updatedAt_gt?: DateTime
  updatedAt_gte?: DateTime
  seller?: UserWhereInput
  likes_every?: ListingLikeWhereInput
  likes_some?: ListingLikeWhereInput
  likes_none?: ListingLikeWhereInput

【参考方案1】：

问题是打字稿不会为对象文字属性推断字符串文字类型，因此status in 将输入为string 而不是'ACTIVE'

您可以明确指定where 的类型：

const where:ListingWhereInput  = .. 

或者您可以使用类型断言来强制属性为字符串文字类型

 status: 'ACTIVE' as  'ACTIVE'