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不要在 rake task 中定義 method, 請用 RAKE::DSL

 2 years ago
source link: https://blog.niclin.tw/2018/09/13/%E4%B8%8D%E8%A6%81%E5%9C%A8-rake-task-%E4%B8%AD%E5%AE%9A%E7%BE%A9-method-%E8%AB%8B%E7%94%A8-rakedsl/
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喜歡在地上滾的工程師

rake task 的 scope 是全域的，如果在任意的 rake 檔案中定義了 method，表面上看起來只有執行到該 task 時會用，但其實是等於為 main:Object 整個 class 定義了 private method，一次性污染了全部的 code。

為了避免污染，可以用 service 對 task 進行封裝，不過更佳的解法可以用 Rake::DSL

DSL is a module that provides task, desc, namespace, etc. Use this when you’d like to use rake outside the top level scope.

# lib/tasks/bicycle.rake

class BicycleTasks
  include Rake::DSL

  def initialize
    namespace :bicycle do
      task :assemble do
        bicycle = Bicycle.new

        # Assemble the bicycle:
        attach_wheels(bicycle)
        attach_handlebars(bicycle)
        attach_brakes(bicycle)
      end
    end
  end

  private

  def attach_wheels(bicycle)
    # ...
  end

  def attach_handlebars(bicycle)
    # ...
  end

  def attach_brakes(bicycle)
    # ...
  end
end

# Instantiate the class to define the tasks:
BicycleTasks.new

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