创建突变后添加到 Apollo 客户端缓存中的数组

Posted 2023-03-10

【中文标题】创建突变后添加到 Apollo 客户端缓存中的数组

【英文标题】：Add to array in Apollo Client cache after create mutation

【发布时间】：2021-03-21 08:53:39

【问题描述】：

在通过突变创建项目后，尝试将项目自动添加到 Apollo 客户端中的缓存数组中，第 32 行出现 TypeScript 错误 (data: )：

Type ' [x: string]: TFetchResultData[]; ' is not assignable to type 'TQuery'.
  ' [x: string]: TFetchResultData[]; ' is assignable to the constraint of type 'TQuery', but 'TQuery' could be instantiated with a different subtype of constraint 'Record<string, TFetchResultData[]>'.ts(2322)
DataProxy.d.ts(17, 9): The expected type comes from property 'data' which is declared here on type 'WriteQueryOptions<TQuery, TVariables>'

这是完整的代码

import  ApolloCache, DataProxy  from '@apollo/client'

export const addToArray = <
  TVariables,
  TData,
  TFetchResultData,
  TQuery extends Record<string, TFetchResultData[]>,
  K
>(
  cache: ApolloCache<K>,
  
    query,
    variables,
    fieldName,
    newItem,
  : 
    query: DataProxy.Query<TVariables, TData>['query']
    variables: DataProxy.Query<TVariables, TData>['variables']
    newItem: TFetchResultData
    fieldName: keyof TQuery
  
): void => 
  // Add to the documentFiles field, if it exists
  const queryResult = cache.readQuery<TQuery, TVariables>(
    query,
    variables,
  )
  if (queryResult) 
    cache.writeQuery<TQuery, TVariables>(
      query,
      variables,
      data: 
        [fieldName]: [...queryResult[fieldName], newItem],
      ,
    )
  

【参考方案1】：

Typescript 抱怨 TQuery 可能有其他字段将被您的代码剥离。

将...queryResult 添加到您的writeQuery 代码：

cache.writeQuery<TQuery, TVariables>(
  query,
  variables,
  data: 
     ...queryResult,
    [fieldName]: [...queryResult[fieldName], newItem],
  ,
)