Ruby 中括号的间距 [英] Spacing around parentheses in Ruby

问题描述

我最近在使路径正常工作时遇到了一些问题.结果证明解决方案很简单，但我遇到了一个意想不到的问题，使我无法解决它.包含在 erb 模板中的以下行非常有效:

I've recently had some problems getting a path working properly. The solution turned out to be simple but I had an unexpected problem that stopped me getting to it. The following line, included in an erb template, works perfectly:

<%= button_to "Confirm delivery", delivery_confirm_path( @delivery ) %>

这个没有:

<%= button_to "Confirm delivery", delivery_confirm_path ( @delivery ) %>

在这种情况下，似乎不允许在左括号之前使用空格.我得到的错误是这样的:

It seems spacing before the opening parenthesis is not allowed in this case. The error I get is this:

/app/views/deliveries/_delivery_buttons.html.erb:22: syntax error,
unexpected tLPAREN_ARG, expecting keyword_do or '{' or '('
...ivery", delivery_confirm_path ( @delivery ) );@output_buffer...
...                               ^

谁能解释为什么会导致错误?

Can anybody explain why this causes an error?

有关信息，这是 Ruby 1.9.2 和 Rails 3.0.9，在 Windows 7 64 位

for info, this is Ruby 1.9.2 and Rails 3.0.9, on Windows 7 64-bit

推荐答案

任何在参数列表括号前加空格的人都会得到他们应得的，我说！

Anyone that puts a space before a parameter-list parentheses gets what they deserve, I say!

问题在于它正在关闭第二个示例中对 button_to 的调用(括号前的空格)，并且不知道接下来要做什么.

The problem is that it's closing out the call to button_to in the second example (space before the parentheses) and doesn't know what to do next.

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