ruby-on-rails - Rubocop Lint /空 : Literal used in void context

Question

我一直在运行 rubocop 并遇到了 Lint/Void: Literal used in void context offence。

以下代码:

routes_and_postcodes.each do |hash|
  2..7.each do |i|
    route = Route.where(name: hash[:route]).first if postcode.delete(" ").first(i) == hash[:postcode].delete(" ")
  end
end

我已阅读 docs ，但仍然无法理解是什么问题。
在上下文中，完整的代码在这里:

def choose_own_van_route(postcode)
route = nil
routes_and_postcodes = []
Route.all.each do |r|
  route_postcodes = r.postcode_array
  route_postcodes.each do |pc|
    routes_and_postcodes << { postcode: pc, route: r.name }
  end
end
routes_and_postcodes.each do |hash|
  2..7.each do |i|
    route = Route.where(name: hash[:route]).first if postcode.delete(" ").first(i) == hash[:postcode].delete(" ")
  end
end
route || Route.create(cut_off_time_mins_since_midnight: 0, name: "BLANK ROUTE HAD TO BE ASSIGNED")
end 

谢谢

Answer 1

2..7.each do |i|
  # ...
end

...是 无效代码 !!你试过运行它吗？您将看到以下错误:

NoMethodError: undefined method `each' for 7:Integer

要解决此问题，您需要定义 Range括号内的:

(2..7).each do |i|
  # ...
end

rubocop错误与此有关:因为如果有 each在 Integer 上定义的方法(没有，但 rubocop 不知道)，那么代码将是有效的，但 2..<something>范围定义没有任何意义；它是一个带有空上下文的文字。