Elixir Absinthe GraphQL，联合 resolve_type list_of/1

Posted 2023-03-08

【中文标题】Elixir Absinthe GraphQL，联合 resolve_type list_of/1

【英文标题】：Elixir Absinthe GraphQL, Union resolve_type list_of/1

【发布时间】：2021-07-25 07:12:34

【问题描述】：

我需要帮助。我正在寻找一种方法来解决联合中的 list_of(:object) 。 这就是我所做的。

object :community_queries do
  field :search, type: :search_result do
    arg(:keyword, non_null(:string))

    resolve(&CommunityResolver.search/3)
  end
end

...

union :search_result do
  description "A search result"

  types [:person, :business]
  resolve_type fn
    %Person, _ -> list_of(:person)
    %Business, _ -> list_of(:business)
  end
end

在上面的代码中。我试图将 list_of(:person) 放入 resolve_type 并返回这样的错误

invalid quoted expression: %Absinthe.Blueprint.TypeReference.Listerrors: [], of_type: :person

然后我尝试了这个

object :community_queries do
  field :search, type: list_of(:search_result) do
    arg(:keyword, non_null(:string))

    resolve(&CommunityResolver.search/3)
  end
end

...

union :search_result do
  description "A search result"

  types [:person, :business]
  resolve_type fn
    %Person, _ -> :person
    %Business, _ -> :business
  end
end

返回

 (BadMapError) expected a map, got: [%name: "John", ...

我也试过把它放在这样的类型中，但也有错误。

...
types [list_of(:person), list_of(:business)]
  resolve_type fn
...

是否有可能的解决方法？

【参考方案1】：

object :community_queries,  do
  field :search, type: list_of(:search_result) do
    arg(:keyword, non_null(:string))

    resolve(&CommunityResolver.search/3)
  end
end

:community_queries 是一个查询参数，应该被定义为一个字段而不是一个查找个人或企业的对象，我们称它们为users。这个定义的字段看起来像是返回:search_result。

field :community_queries, :search_result do
  arg(:keyword, non_null(:string))

  resolve(&CommunityResolver.search/3)
end

您需要定义search_result 对象的外观，这听起来像是users 的列表。

更多关于查询参数here