创建特定班级的rubocop cop

Question

我们有一个内部使用的库，要求您从定义的方法中返回特定类型。我正在尝试写一个警察，使我们能够检测到这种情况。 Here is the situation I want to detect and flag:

1. You are inside the Slayer::Command class
2. You've returned something other than a call to pass or flunk !

It doesn't seem like there's an easy way to check both the call and the parent class, but I know it's doable, because the Rails/HasAndBelongsToMany COP仅触发铁轨模型，而不是轨道控制器。更具体地说，肯定不是一个迭代所有回报的简单方法，因为此错误的数字1是人们忘记了方法的最后一个分支是返回级别。

到目前为止，我需要的是：

require 'rubocop'

module Slayer
  class CommandReturn < RuboCop::Cop::Base
    def_node_search :explicit_returns, 'return'
    def_node_matcher :slayer_command?, "(class (const (const nil :Slayer) :Command) _)"
    def_node_matcher :is_call_to_pass?, "(send nil :pass ?)"
    def_node_matcher :is_call_to_flunk?, "(send nil :flunk! ?)"

    def on_def(node)
      return unless node.method?(:call)
      return unless in_slayer_command?(node)

      explicit_returns(node) do |node|
        validate_return! node.child_nodes.first, node
      end

      return # Temporarily does not look at implicit returns
      implicit_returns(node) do |node|
        validate_return! node
      end
    end

    private

    # Continue traversing `node` until you get to the last expression.
    # If that expression is a call to `.can_see?`, then add an offense.
    def implicit_returns(node)
      raise "Not Implemented Yet"
    end

    def in_slayer_command?(node)
      node.ancestors.any? &:slayer_command?
    end

    def validate_return!(node, return_node = nil)
      return if is_call_to_pass? node
      return if is_call_to_flunk? node

      add_offense(return_node || node, message: "call in Slayer::Command must return the result of `pass` or call `flunk!`")
    end
  end
end

我需要两件事：

1. 这确实是检查班级父母的最佳方法吗？从Slayer ::命令继承的其他内容继承呢？这里有些东西。
2. 实现ntimit_returns方法的最佳方法是什么？感觉就像应该烘烤，我只是错过了它。