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Delegate is actually an alias

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难度
3/5
预计耗时
1-2 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
rails, ruby
领域
api

调研方向

从 JSONAPI::Resource 和 attributes 选项的委托处理入手，然后将其行为与 issue 中 Ruby 和 Rails 的委托示例进行比较。当 delegate 选项按照描述将方法转发给被委托对象，或其类似别名的行为得到清晰文档说明时，即视为完成。

由索引模型根据 Issue 内容生成。

描述

When working with the gem and trying to look at how to hide underlying models I came across the delegate option which is available on a resource.

Using this option I expected the same result as with the definitions provided in both ruby and rails. When I delegate a method to something, it calls the method being delegated on that something.

An example:

class Bar
  attr_accessor :name

  def initialize
    @name = "Test"
  end
end

class Foo
  extend Forwardable
  attr_accessor :bar

  def initialize
    @bar = Bar.new
  end

  def_delegator :@bar, :name
end

Foo.new.name            # => "Test"
foo = Foo.new
foo.bar.name = "Demo"
foo.name                # => "Demo"

This passes the delegate method along to the object @bar.

Now looking at the way it is defined in JSONAPI::Resource we have the following option:

class Bar
  attr_accessor :name

  def initialize
    @name = "Test"
  end
end

class Foo
  attr_accessor :bar

  def initialize
    @bar = Bar.new
  end
end

class FooResource < JSONAPI::Resource
  attributes :name, delegate: :bar
end

FooResource.new(Foo.new, {}).name  # => <Bar:0x007fd288c69708 @name="Test">

As you can see when calling name on the resource it gives me back the object Bar instead of calling the method name on the Bar object. This is more in line with how alias works instead of how delegate works.

It might be an idea to make this clearer in the documentation to prevent any confusion, and it maybe an idea in the future to modify this behaviour to be the same as how ruby and rails handle this.

主要语言
Ruby
星标
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派生
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30 天内没有已合并 PR

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