Ruby如何解析：a.b = B.new a.b.c = C.new？

Question

我假设它将其视为

a.b = (B.new (a.b.c = C.new))

这是一行：

request.transactionRequest.payment = PaymentType.new request.transactionRequest.payment.creditCard = CreditCardType.new('4242424242424242','0220','123')

https://developer.authorize.net/hello_world/

我假设它会将其视为

  

request.transactionRequest.payment =（PaymentType.new（request.transactionRequest.payment.creditCard = CreditCardType.new（＆＃39; 4242424242424242＆＃39;，＆＃39; 0220＆＃39;，＆＃39; 123＆＃ 39;）））

如果payment.creditCard已设置，如何分配payment？不会产生零指针错误吗？即使它有效，为什么要在设置payment时覆盖payment.creditCard呢？

Answer 1

缺少换行符，就是全部：

request.transactionRequest.payment = PaymentType.new
request.transactionRequest.payment.creditCard = CreditCardType.new('4242424242424242','0220','123')

虽然单行版本是有效的Ruby语法，但如果没有正当理由，它也不是你在生产代码中所做的事情。