代码之家 › 专栏 › 技术社区 › Dr. Frankenstein

这个红宝石土豆泥怎么了?

hash ruby

0

Dr. Frankenstein · 技术社区 · 16 年前

我对Ruby还很陌生,我一直都有以下错误:

in gem_original_require': ./helpers/navigation.rb:28: odd number list for Hash (SyntaxError)

感谢您的帮助…

   module Sinatra::Navigation

        def navigation

            @navigation

                nav = {

                        primary[0] = {
                         :title => "cheddar",
                         :active => false,
                         :children => {
                           { :title => "cheese", :active => false },
                           { :title => "ham", :active => false }
                          }
                        },

                        primary[1] = {
                         :title => "gorgonzola",
                         :active => false,
                         :children => {
                           { :title => "What is the cheese?", :active => false },
                           { :title => "What cheese", :active => false },
                           { :title => "What does the cheese tell us?", :active => false, :children => {
                              { :title => "Cheessus", :active => false },
                              { :title => "The impact of different cheeses / characteristics for cheese in relation to CHSE outcomes", :active => false }
                            }
                           }
                          }
                        }
                }

3 回复 | 直到 16 年前

1

6

sepp2k 16 年前

在Ruby中,大括号用于描述由成对的键和值组成的哈希图。方括号用于描述数组。您的子属性不包含键值对,因此您必须生成一个数组而不是哈希。

因此,而不是

:children => {
  { :title => "cheese", :active => false },
  { :title => "ham", :active => false }
}

做:

:children => [
  { :title => "cheese", :active => false },
  { :title => "ham", :active => false }
]

另一次同样发生 :children .

我也不确定 primary[0] = 是应该实现的,但它几乎肯定不会做你想做的。它所做的是将 primary (这意味着名为primary的数组必须在赋值之前存在),然后返回该元素。

如果您想构造散列以便可以像 nav[:primary][0][:children][0] ,您必须这样做:

nav = {
  :primary => [
    {:title => "cheddar",
     :active => false,
     :children => [
                    { :title => "cheese", :active => false },
                    { :title => "ham", :active => false }
                  ]
    },
    {
       :title => "gorgonzola",
       #...
    }]
}

还要注意这一行 @navigation 就在你分配给 nav 什么都不做。

2

1

Sindri Guðmundsson 16 年前

在第一个哈希表中,您有

:children => {
    { :title => "cheese", :active => false },
    { :title => "ham", :active => false }
}

您的:children散列应该是一个数组,由方括号而不是大括号组成:)

3

1

Jeriko 16 年前

我认为您可能会混淆数组和哈希。我认为有两点你可能想用数组 [] 而不是散列 {} . 固定代码如下:

nav = [
       { :title => "cheddar",
         :active => false,
         :children => [
            { :title => "cheese", :active => false },
            { :title => "ham", :active => false }
           ]
        },
        { :title => "gorgonzola",
          :active => false,
          :children => [
           { :title => "What is the cheese?", :active => false },
           { :title => "What cheese", :active => false },
           { :title => "What does the cheese tell us?", :active => false, 
             :children => [
               { :title => "Cheessus", :active => false },
               { :title => "The impact of different cheeses / characteristics for cheese in relation to CHSE outcomes", :active => false }
            ]
          }]
        }
     ]