突变后无法更新缓存 [英] unable to update cache after mutation

问题描述

我有一个屏幕，我可以在其中运行查询并根据结果呈现一些项目:

I have a screen where I run a query and render some items based on the results:

query getMyFavoritePlaces($myID: String) {
  favorite_place(where: { user_id: { _eq: $myID } }) {
    id
    location
    label
    user{
      id
    }
    user_id
  }
}

const { data, error } = useGetMyFavoritePlacesQuery({ variables: { myID: profile.id }});
{
    data && (
    <FlatList
      data={data.favorite_place}
      renderItem={({ item }) => <FavoriteLocationEntry place={item} />}
      keyExtractor={(item) => item.id.toString()} />
    )
}

当我通过单击 flatlets 中的任何项目来运行此更改时:

When I run this mutation by clicking on any of the items from the flatlets:

mutation RemoveFavoriteLocation($id: Int!) {
  delete_favorite_place_by_pk(id: $id) {
    id
    location
    label
    user{
      favorite_places {
        id
         location
          label
      }
    }
    user_id
  }
}

该对象已成功删除，并且 UI 也已更新.但是，我收到警告

The object gets deleted successfully and the UI is also updated. However, I get a warning that

替换 Query 对象的 favourite_place 字段时，缓存数据可能会丢失.为了解决这个问题，为 Query.favorite_place 字段定义一个自定义合并函数，这样 InMemoryCache 可以安全地合并这些对象:{ ... }

Cache data may be lost when replacing the favourite_place field of a Query object. To address this problem define a custom merge function for the Query.favorite_place field, so InMemoryCache can safely merge these objects: { ... }

此处显示的值为 ID.我已经在查询和变异中都返回了 id.那我该如何解决?

The values shown here are the ids. I am already returning ids in both, the query and mutation. How can I fix it then?

可能无法在突变内运行 favourite_place 查询本身.

It might not be possible to run the favourite_place query itself within the mutation.

推荐答案

您的变更需要包含用户的 id 字段，否则可能会错误地删除其他用户的 favourite_place 字段:

Your mutation needs to include an id field for the user or it may mistakenly delete a favourite_place field for a different user:

mutation RemoveFavoriteLocation($id: Int!) {
  delete_favorite_place_by_pk(id: $id) {
    id
    location
    label
    user{
      **id**
      favorite_places {
        id
        location
        label
      }
    }
    user_id
  }
}

P.s 请不要包含星号，只是为了将焦点放在缺失的属性上.

P.s please don't include the asterisks, just there to bring focus to the missing property.

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