在开发环境中为外部呼叫创建虚假行为 [英] Create fake behavior for external call in development environment

问题描述

我正在执行需要搜索外部API的代码，但是在开发过程中，我无法访问此API，因此我当前用于运行服务器并浏览系统的解决方案是：

I'm doing a code that need to search a external API, but during development I haven't access to this API, so my current solution to run the server and navigate through the system is:

def api_call
   return { fake: 'This is a fake return' } if Rails.env.development?

   # api interaction code
   # ...
end

这让我的代码很脏，所以我的问题是：有一种模式（或更好的方法）可以做到这一点？

This let my code dirt, so my question is: There are a pattern (or a better way) to do this?

推荐答案

我使用的模式是将api对象替换为一种在开发过程中伪造所有方法的对象。

The pattern I use is to replace api object with one that fakes all methods when in development.

class Api
  def query
    # perform api query
  end
end

class FakeApi
  def query
    { fake: 'This is a fake return' }
  end
end

# config/environments/production.rb
config.api = Api.new

# config/environments/test.rb
# config/environments/development.rb
config.api = FakeApi.new

# then

def api_call
  Rails.configuration.api.query # no branching here! code is clean
end

基本上，您有两个类， Api 可以完成实际工作，而 FakeApi 可以返回预先烘焙的伪造响应。然后，您可以使用Rails的环境配置在不同的环境中设置不同的api。这样，您的客户端代码（调用 #query ）就不必关心当前环境。

Basically, you have two classes, Api which does real work and FakeApi that returns pre-baked faked responses. You then use Rails' environment configuration to set different apis in different environments. This way, your client code (that calls #query) doesn't have to care about current environment.

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