ruby - 将回调放在同一行

Question

我无论如何都不是 Ruby 开发人员，我正在修改 Chef 食谱。我很好奇是否可以将以下内容放在一行中。

directory "/var/lib/mysql" do
  action :delete
end

我试过这个：

directory "/var/lib/mysql", :action => "delete"

但是，这会引发此错误：

ArgumentError
-------------
wrong number of arguments (3 for 2)

我也见过这个，但这对我来说似乎很尴尬：

directory "/var/lib/mysql" do action => "delete" end

Answer 1

you can do two ways, as said using something called a block

directory("/var/lib/mysql") { action :delete }

and you can put your code this way, just to tell you the semi-colon exists in ruby ;))

directory "/var/lib/mysql" do ; action :delete ; end

Answer 2

大括号等效于do...end，并且更常用于单行：

directory("/var/lib/mysql") { action :delete }

需要添加括号以避免歧义，因为大括号也用于定义散列。