无法在Ruby中创建哈希

Question

循环在具有特定键值对的文本文件上运行三次。每个循环都会返回一个新的散列，如下所示。我想将这些散列存储到另一个散列中。group p1，group p2和group p3是散列的关键：

"group1"
{
    "path"=>"/tmp/",
    "max_hits"=>262144,
    "min_hits"=>5240
}

"group2"
{
    "basic_size_limit"=>262144,
    "path"=> "/usr/bin/ruby",
    "max_hits"=>2412,
    "min_hits"=>871
}

"group3"
{
    "path"=>"/usr/tmp/",
    "basic_time_limits"=>[26214400, 26214401, 26214402],
}

我将上述散列初始化为groups=Hash。新建而不是我想将它们存储到散列中。我想初始化更大的散列，比如groupofgroups=hash。new{散列，key{散列[key]=hash.new}。

group_of_groups = Hash.new{|hash, key| hash[key] = Hash.new}
Loop i in 1 .. 3
    groups = Hash.new
    ####
        Do something and add to the hash groups
    ####
    key_name = "group" + i
    group_of_groups[key_name] = groups
end Loop

但它只给了我{“group1”=

如何解决这个问题？




Answer 1

除了其他答案，如果您需要以编程方式构建哈希，也可以这样做：

group1 = {
    "path"=>"/tmp/",
    "max_hits"=>262144,
    "min_hits"=>5240
}

group2 = {
    "basic_size_limit"=>262144,
    "path"=> "/usr/bin/ruby",
    "max_hits"=>2412,
    "min_hits"=>871
}

group3 = {
    "path"=>"/usr/tmp/",
    "basic_time_limits"=>[26214400, 26214401, 26214402],
}

group_of_groups = 
    ["group1", "group2", "group3"].each_with_object({}) do |sub_hash_name, new_hash|
        new_hash[sub_hash_name] = instance_eval(sub_hash_name)
    end

# Result
{
    "group1" => {
        "path"=>"/tmp/",
        "max_hits"=>262144,
        "min_hits"=>5240
    }, 
    "group2" => {
        "basic_size_limit"=>262144,
        "path"=> "/usr/bin/ruby",
        "max_hits"=>2412,
        "min_hits"=>871
    },
    "group3" => {
        "path"=>"/usr/tmp/",
        "basic_time_limits"=>[26214400, 26214401, 26214402],
    },
}

Answer 2

如果要一次性初始化所有内容，可以将其编写为：

group_of_groups = { 
    "group1" => {
        "path"=>"/tmp/",
        "max_hits"=>262144,
        "min_hits"=>5240
    },
    "group2" => {
        "basic_size_limit"=>262144,
        "path"=> "/usr/bin/ruby",
        "max_hits"=>2412,
        "min_hits"=>871
    },
    "group3" => {
        "path"=>"/usr/tmp/",
        "basic_time_limits"=>[26214400, 26214401, 26214402],
    }
}

换行符明确了什么属于什么，但不是必需的。

Answer 3

如果你有3个哈希在3个变量组1，组2，

group1 = {
    "path"=>"/tmp/",
    "max_hits"=>262144,
    "min_hits"=>5240
}

group2 = {
    "basic_size_limit"=>262144,
    "path"=> "/usr/bin/ruby",
    "max_hits"=>2412,
    "min_hits"=>871
}

group3 = {
    "path"=>"/usr/tmp/",
    "basic_time_limits"=>[26214400, 26214401, 26214402],
}

group_of_groups = {"group1"=>group1, "group2"=>group2, "group3"=>group3}

# result
{
    "group1" => {
        "path"=>"/tmp/",
        "max_hits"=>262144,
        "min_hits"=>5240
    }, 
    "group2" => {
        "basic_size_limit"=>262144,
        "path"=> "/usr/bin/ruby",
        "max_hits"=>2412,
        "min_hits"=>871
    },
    "group3" => {
        "path"=>"/usr/tmp/",
        "basic_time_limits"=>[26214400, 26214401, 26214402],
    },
}

请记住，Ruby中的所有内容都是通过引用实现的，因此修改组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组组。