ruby-on-rails - 如何为产生可迭代的函数添加默认错误处理？

Question

我有一个模型Transaction和一个方法external_evaluation。 external_evaluation在堆栈中向下移动，并最终调用AWS Lambda。如果响应不正确，则会引发BadResponse异常。

代码库中有一种经常使用的模式，例如

def get_some_transactions() 
  Transaction.where(some_column: some_expression)
end

def do_some_stuff()
  get_some_transactions.each do |transaction|
    do_something(transaction.external_evaluation)
  rescue BadResponse => e
    log(e)
    next
  end
end

def do_some_other_stuff()
  get_some_transactions.each_with_object({}) do |transaction, transaction_hash|
    transaction_hash[transaction] = do_something_else(transaction.external_evaluation)
  rescue BadResponse => e
    log(e)
    next
  end
end

我真的不喜欢这种模式中错误处理代码的重复，并且希望能够将默认错误处理添加到get_some_transactions中，无论调用哪个迭代函数(each，each_with_object，each_with_index，...)，该默认错误处理都将适用。在Ruby中有惯用的方法吗？

Answer 1

def with_error_handing(&block)
  begin
    yield
  rescue BadResponse => e
    log(e)
  end
end

def do_some_stuff()
  get_some_transactions.each do |transaction|
    with_error_handing do
      do_something(transaction.external_evaluation)
    end
  end
end

def do_some_other_stuff()
  get_some_transactions.each_with_object({}) do |transaction, transaction_hash|
    with_error_handing do
      transaction_hash[transaction] = do_something_else(transaction.external_evaluation)
    end
  end
end