从方法内调用 next 进行外循环

Question

是否可以在外循环的方法中调用 next:

bot.rb

while Option.daemon_active?(daemon: "bot")
  .....
  Trade.market_order
  ....
end

trade.rb

class Trade
  def self.market_order
     ... complex code ...
     response = exchange.market_sell
     next if response["state"] == false # This fails. This should start new iteration of while in bot.rb
  end
end

有个很相似的问题，不过好像不太适合我：call next on ruby loop from external method

Answer 1

是的。您应该使用 throw 和 catch.

bot.rb

while Option.daemon_active?(daemon: "bot")
  catch(:foo) do
    ...
    Trade.market_order
    ...
  end
end

trade.rb

class Trade
  def self.market_order
    ...
    response = exchange.market_sell
    throw :foo if response["state"] == false
  end
end

从方法内调用 next 进行外循环

Call next for outer loop from within a method

ruby

loops

next