执行时,Ruby卷括号块语法不起作用

Question

我正在使用这个宝石.当我使用以下语法时,它工作正常:

every :day do
  rake 'billing:daily'
end

但是,当我使用以下语法时,gem给出了语法错误:

every :day { rake 'billing:daily' }

输出:

~/.rbenv/versions/2.4.3/lib/ruby/gems/2.4.0/gems/whenever-0.10.0/lib/whenever/job_list.rb:25:in `instance_eval': config/schedule.rb:26: syntax error, unexpected '{', expecting end-of-input (SyntaxError)
every :day { rake 'billing:daily' }
            ^
    from ~/.rbenv/versions/2.4.3/lib/ruby/gems/2.4.0/gems/whenever-0.10.0/lib/whenever/job_list.rb:25:in `initialize'
    from ~/.rbenv/versions/2.4.3/lib/ruby/gems/2.4.0/gems/whenever-0.10.0/lib/whenever.rb:12:in `new'
    from ~/.rbenv/versions/2.4.3/lib/ruby/gems/2.4.0/gems/whenever-0.10.0/lib/whenever.rb:12:in `cron'
    from ~/.rbenv/versions/2.4.3/lib/ruby/gems/2.4.0/gems/whenever-0.10.0/lib/whenever/command_line.rb:42:in `run'
    from ~/.rbenv/versions/2.4.3/lib/ruby/gems/2.4.0/gems/whenever-0.10.0/lib/whenever/command_line.rb:6:in `execute'
    from ~/.rbenv/versions/2.4.3/lib/ruby/gems/2.4.0/gems/whenever-0.10.0/bin/whenever:44:in `<top (required)>'
    from ~/.rbenv/versions/2.4.3/bin/whenever:23:in `load'
    from ~/.rbenv/versions/2.4.3/bin/whenever:23:in `<main>'

两个都不是一回事吗？为什么前者工作但后者不工作？

Answer 1

这是一个解析/优先问题.大括号尝试绑定到最近的标记,:day在这种情况下,但您希望它绑定到every().您必须编写every(:day) { rake 'billing:daily' }以明确地将其绑定到正确的令牌.