Question

我尝试合并2个哈希值，创建一个新值。我试过

Hash[b.map{|k,v| [a[k],v]}

但是当它发现＆＃34; a＆＃34;值是空的（无）它没有打印b [k] ......我有类似的东西：

|  A |  A  |        |  B |  B  | ====> |  C    |   C   |
| key|value|        | key|value| ====> |B_value|A_value|
| key|value|        | key|value| ====> |B_value|A_value|
| key| nil |        | key|value| ====>      MISSING
| key|value|        | key|value| ====> |B_value|A_value|

钥匙是一样的我还需要看到零。

如果我尝试以数组格式打印，我可以看到所有内容（包括零）：

p = a.map{|k,v| [b[k],v]}

可能地图不是正确的解决方案，还有其他可以给我相同结果的东西吗？

这是我的代码：

header_hostname = Hash.new
working_host = Hash.new
fileset.each do |file|
header = YAML.load_file("output/#{file}")
header.each do |k_header,v_header|
    if v_header == "Hostname"
        header_hostname = header
    end
end
working_host = Hash[header.map{|k, v| [header_hostname[k], v] }]
puts working_host
File.open("tmp/working_hosts.txt","a+") << working_host

Hash的输出如下：

...

Erogazione VlanID: '2390'
" SubnetorIP": 10.*.*.*
" Netmask": 255.255.255.240
" Gateway": 10.*.*.*

...

Backup VlanID: ''
Managment VlanID: ''
Privata HB VlanID: ''
Remote Console VlanID: ''

...

散列

Header = {"98"=>"Erogazione VlanID", "99"=>" SubnetorIP", "100"=>" Netmask", "101"=>" Gateway", "102"=>" Speed(f,g)", "103"=>" Bond(s/n)", "104"=>" Porte", "105"=>" Switch", "106"=>" Slot/Porte", "107"=>" PortePPanel", "108"=>" PortePPanel(bond)", "109"=>"Backup VlanID", "110"=>" SubnetorIP", "111"=>" Netmask", "112"=>" Gateway", "113"=>" Speed(f,g)", "114"=>" Porte", "115"=>" Switch", "116"=>" Slot/Porte", "117"=>" PortePPanel", "135"=>"Remote Console VlanID", "136"=>" SubnetorIP", "137"=>" Netmask", "138"=>" Gateway", "139"=>" Speed(f,g)", "140"=>" Porte", "141"=>" Switch", "142"=>" Slot/Porte", "143"=>" PortePPanel"}

Machine1 = {"98"=>"3315", "99"=>"10.*.*.*", "100"=>"255.255.255.240", "101"=>"10.*.*.*", "102"=>"g", "103"=>"", "104"=>"2.0", "105"=>"", "106"=>"", "107"=>"", "108"=>"", "109"=>"111", "110"=>"10.*.*.*", "111"=>"255.255.255.240", "112"=>"10.*.*.*", "113"=>"g", "114"=>"1.0", "115"=>"", "116"=>"", "117"=>"", "135"=>"111", "136"=>"10.*.*.*", "137"=>"255.255.255.240", "138"=>"10.*.*.*", "139"=>"", "140"=>"", "141"=>"", "142"=>"", "143"=>"" }

这是输出：

output = {"Erogazione VlanID"=>"3315", " SubnetorIP"=>"10.*.*.*", " Netmask"=>"255.255.255.240", " Gateway"=>"10.*.*.*", " Speed(f,g)"=>"", " Bond(s/n)"=>"", " Porte"=>"", " Switch"=>"", " Slot/Porte"=>"", " PortePPanel"=>"", " PortePPanel(bond)"=>"", "Backup VlanID"=>"111", "Remote Console VlanID"=>"111"}

Answer 1

您的方法似乎运行正常，并且不会在生成的哈希中产生“缺失”条目。

a = { a: 1, b: 2, c: nil, d: 4 }
b = { a: 5, b: 6, c: 7,   d: 8 }

c = Hash[a.map{|k,v| [b[k],v]}]
# {5=>1, 6=>2, 7=>nil, 8=>4}

a[:c]值没有问题，即nil。它将生成7 => nil映射，b[:c]为7。

Ruby合并哈希值为零值

1 个答案: