GitHub GraphQL API 的 Apollo 客户端响应不是 JSON 格式

Posted 2023-03-08

【中文标题】GitHub GraphQL API 的 Apollo 客户端响应不是 JSON 格式

【英文标题】：Apollo Client response not in JSON format for GitHub GraphQL APIs

【发布时间】：2019-06-19 18:45:00

【问题描述】：

我正在使用 apollo-client 在 android 上试验 GraphQL，并且正在使用 GitHub 的 GraphQL API。我正在点击一个 API 来给我一个用户拥有的存储库列表。一切正常，但我得到的响应不是 JSON 格式，而是字符串格式。

响应如下所示：

Datauser=User__typename=User, 
repositories=Repositories__typename=RepositoryConnection, nodes= 
[Node__typename=Repository, name=testrepository]

当我尝试通过 Insomnia（GraphQL 休息客户端）点击 url 时，我得到 JSON 格式的响应，但在我的应用程序中，我得到上述格式的响应。我尝试在标题中传递 content-type : "application/json; charset=utf-8" 但没有成功。

这是我获取响应的方式：

public void fetchRepoList(String userName, String authHeader, final ResponseCallback responseCallback) 
    GraphQL.getInstance().getApolloClient(authHeader)
            .query(githubRepoList.repoListAPI.FindQuery.builder().repoOwner(userName).build())
            .enqueue(new ApolloCall.Callback<githubRepoList.repoListAPI.FindQuery.Data>() 
                @Override
                public void onResponse(@Nonnull Response<githubRepoList.repoListAPI.FindQuery.Data> response) 
                  Log.d(TAG, "response" + response)
                

                @Override
                public void onFailure(@Nonnull final ApolloException exception) 

                
            );

我想将响应放入模型类列表中，为此我需要 JSON 格式的响应。搜索了这个问题，但没有得到任何适当的解决方案。

我正在使用 apollo 客户端 0.3.2

[编辑：1]

我尝试使用 Okhttp 调用 GitHub GraphQL API，这次我得到了这样的响应：

"data":"__schema":"queryType":"name":"Query","mutationType":"name":"Mutation","subscriptionType":null,"types":["kind":"SCALAR","name":"Boolean","description":"Represents `true` or `false` values.","fields":null,"inputFields":null,"interfaces":null,"enumValues":null,"possibleTypes":null,"kind":"SCALAR","name":"String","description":"Represents textual data as UTF-8 character sequences. This type is most often used by GraphQL to represent free-form human-readable text.","fields":null,"inputFields":null,"interfaces":null,"enumValues":null,"possibleTypes":null,"kind":"OBJECT","name":"Query","description":"The query root of GitHub's GraphQL interface.","fields":["name":"codeOfConduct","description":"Look up a code of conduct by its key","args":["name":"key","description":"The code of conduct's key","type":"kind":"NON_NULL","name":null,"ofType":"kind":"SCALAR","name":"String","ofType":null,"defaultValue":null],"type":"kind":"OBJECT","name":"CodeOfConduct","ofType":null,"isDeprecated":false,"deprecationReason":null,"name":"codesOfConduct","description":"Look up a code of conduct by its key","args":[],"type":"kind":"LIST","name":null,"ofType":"kind":"OBJECT","name":"CodeOfConduct","ofType":null,"isDeprecated":false,"deprecationReason":null,"name":"license","description":"Look up an open source license by its key","args":["name":"key","description":"The license's downcased SPDX ID","type":"kind":"NON_NULL","name":null,"ofType":"kind":"SCALAR","name":"String","ofType":null,"defaultValue":null],"type":"kind":"OBJECT","name":"License","ofType":null,"isDeprecated":false,"deprecationReason":null,"name":"licenses","description":"Return a list of known open source licenses","args":[],"type":"kind":"NON_NULL","name":null,"ofType":"kind":"LIST","name":null,"ofType":"kind":"OBJECT","name":"License","ofType":null,"isDeprecated":false,"deprecationReason":null,"name":"marketplaceCategories","description":"Get alphabetically sorted list of Marketplace categories","args":["name":"includeCategories","description":"Return only the specified categories.","type":"kind":"LIST","name":null,"ofType":"kind":"NON_NULL","name":null,"ofType":"kind":"SCALAR","name":"String","ofType":null,"defaultValue":null,"name":"excludeEmpty","description":"Exclude categories with no listings.","type":"kind":"SCALAR","name":"Boolean","ofType":null,"defaultValue":null,"name":"excludeSubcategories","description":"Returns top level categories only, excluding any subcategories.","type":"kind":"SCALAR","name":"Boolean","ofType":null,"defaultValue":null],"type":"kind":"NON_NULL","name":null,"ofType":"kind":"LIST","name":null,"ofType":"kind":"NON_NULL","name":null,"ofType":"kind":"OBJECT","name":"MarketplaceCategory","ofType":null,"isDeprecated":false,"deprecationReason":null,"name":"marketplaceCategory","description":"Look up a Marketplace category by its slug.","args":["name":"slug","description":"The URL slug of the category.","type":"kind":"NON_NULL","name":null,"ofType":"kind":"SCALAR","name":"String","ofType":null,"defaultValue":null,"name":"useTopicAliases","description":"Also check topic aliases for the category slug","type":"kind":"SCALAR","name":"Boolean","ofType":null,"defaultValue":null],"type":"kind":"OBJECT","name":"MarketplaceCategory","ofType":null,"isDeprecated":false,"deprecationReason":null,"name":"marketplaceListing","description":"Look up a single Marketplace listing","args":["name":"slug","description":"Select the listing that matches this slug. It's the short name of the listing used in its URL.","type":"kind":"NON_NULL","name":null,"ofType":"kind":"SCALAR","name":"String","ofType":null,"defaultValue":null],"type":"kind":"OBJECT","name":"MarketplaceListing","ofType":null,"isDeprecated":false,"deprecationReason":null,"name":"marketplaceListings","description":"Look up Marketplace listings","args":["name":"after","description":"Returns the elements in the list that come after the specified cursor.","type"

此响应甚至没有关于存储库的所需数据。它甚至与存储库列表无关。

因此，我回到旧方法并使用 apollo 进行调用。现在，由于 apollo 从标准 GraphQL 查询创建这些模型类，我如何创建这个模型类的列表。

我浏览了 github 上的 apollo sample-app，发现了这段代码：

List<FeedEntry> feedResponseToEntriesWithRepositories(Response<FeedQuery.Data> response) 
List<FeedEntry> feedEntriesWithRepos = new ArrayList<>();
final FeedQuery.Data responseData = response.data();
if (responseData == null) 
  return Collections.emptyList();

final List<FeedEntry> feedEntries = responseData.feedEntries();
if (feedEntries == null) 
  return Collections.emptyList();

for (FeedEntry entry : feedEntries) 
  if (entry.repository() != null) 
    feedEntriesWithRepos.add(entry);
  

return feedEntriesWithRepos;

这里的feedEntries()方法返回的是feed列表，这个方法在apollo目录下自动生成的模型类文件中。我去检查了我的模型文件，没有返回 repos 列表的方法（如我的情况）。该文件太大，无法在此处发布，但如果社区想要查看它，我可以将其发布在这里。

顺便说一句，我用我的代码尝试过这样的事情：

List<githubRepoList.repoListAPI.FindQuery.Node> repoList = new ArrayList<>();
final githubRepoList.repoListAPI.FindQuery.Data repoListData = response.data();
final List<githubRepoList.repoListAPI.FindQuery.Node> finalRepoList = repoListData.(which method to call from the auto-generated class file?)

这里，Node 是我在 apollo 目录中自动生成的模型文件中的一个类，这个类应该有一个返回 repo 模型类列表的方法。

我知道我在这里做错了。我认为还有其他方法可以创建这些模型类的列表。

【问题讨论】：

“响应看起来像这样”——请提供minimal reproducible example 显示您如何获得该输出。这看起来像是 Data 类的 toString() 实现，这可能是完全合理的。

@CommonsWare 我已经编辑了我的问题

@CommonsWare 是的，我正在使用 toString() 但响应不是 JSON 格式

【参考方案1】：

响应不是 JSON 格式

响应是 JSON 格式。它现在采用githubRepoList.repoListAPI.FindQuery.Data 对象的形式。该类是根据您的 GraphQL 文档为您生成的代码。引用the Apollo-Android documentation，并强调：

Apollo-Android 是一个兼容 GraphQL 的客户端从标准 GraphQL 查询生成 Java 模型

特别是，Apollo-Android 在这些 Java 模型类上生成 toString() 实现。在你的情况下：

Data 在 user 字段中包含 User User 包含 RepositoriesConnection，重命名为 Repositories，在 repositories 字段中 repositories 集合包含一个 Repository

使用 Apollo-Android 的原因是您不必自己处理 JSON。相反，如果您想自己解析 JSON，请摆脱 Apollo-Android，只使用 OkHttp 进行 Web 服务调用。

【讨论】：

我尝试使用 okhttp 拨打电话，但没有得到正确响应

@localhost：所以...只需使用您拥有的代码，然后从Data 对象中获取您的数据。 它已经为你解析了。

让我试试。我会发布我发现的任何内容

这是一个愚蠢的错误。回购列表位于 user().repositories().node()

下