Documentation for ResourceSerializer with includes is incorrect

从 v0.10 serializer 指南的 include 部分开始，并将其中的示例与 test/unit/serializer/serializer_test.rb 约第 205-226 行的内容进行比较。复现文档中记录的 ResourceSerializer 调用，然后确定是文档还是 serializer 的行为不正确。当文档中的 include 工作流准确无误并由一个针对性测试覆盖时，即视为完成。

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Description

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Bug reports:

The documentation says that ResourceSerailizer should be able to include resources by doing something like this:

post = Post.find(1)

JSONAPI::ResourceSerializer.new(PostResource,
  include: ['comments'],
).serialize_to_hash(PostResource.new(post, nil))

But when I do this I don't get an included section in the serialized output.

Additionally I don't find any tests in the test suite that demonstrate the documented way of doing it, but I find several tests that seem to achieve includes via much more verbose and laborious methods.

Am I missing something?