Question

我正在尝试创建一个二维哈希，如下所示：

permissions['enrollment'] = ['read' => true, 'create' => true, 'update' => true]
permissions['invoices'] = ['read' => true, 'create' => false, 'update' => false]

这就是我做的......

permissions = Hash.new
permissions['enrollment'] = ['read' => true, 'create' => true, 'update' => true]
permissions['invoices'] = ['read' => true, 'create' => false, 'update' => false]

当我在irb中“放置”权限时，我得到了这个......

{
   "enrollment"=>[{"read"=>true, "create"=>false, "edit"=>false}],
   "invoices"=>[{"read"=>true, "create"=>false, "update"=>false}]
 }

从上面的输出中可以看出，似乎在另一个哈希中有一个哈希用于权限['enrollment'] [{}] !!!

我想访问注册的读取权限，如下所示：permissions['enrollment']['read']但根据puts permission，它将无效，我收到此错误TypeError: can't convert String into Integer

要让我访问注册的读取权限，我必须这样做：permissions['enrollment'][0]['read']。

如何才能使注册读取权限与此相同...... permissions['enrollment']['read']？

Answer 1

您的语法已关闭。哈希由花括号分隔。方括号用于数组。如果你来自PHP世界，你可能会混淆两者。试试这个：

permissions = Hash.new
permissions['enrollment'] = {'read' => true, 'create' => true, 'update' => true}
permissions['invoices'] = {'read' => true, 'create' => false, 'update' => false}

为什么在向哈希添加哈希时，Ruby似乎嵌套了添加的哈希？

1 个答案: