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

Question

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：

Data{user=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。

Answer 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。