Question

我有a = first

=> <Ng::EntityConfiguration id: 15881, entity_id: 1, entity_type: "Ng::Company", key: "wpa2.psk", value: "[{"ssid":"LVL6-Staff","password":"987654321", created_at: "2016-11-08 05:13:04", updated_at: "2016-11-08 05:13:04", name: "WIFI/Level 6">

因此，当我致电a.value时，它会返回=> "[{"ssid":"LVL6-Staff","password":"987654321","dhcp":"Enabled"}]"

然后，我想获得密码的值：

x = JSON.parse(a.value)
x.last['password']
=> "987654321"

我的问题是，在获取密码值后，我想将密码值更新为＆＃39; 123456789＆＃39;并保存。怎么做到这一点？

Answer 1

这应该很简单。

string = '[{"ssid":"LVL6-Staff","password":"987654321","dhcp":"Enabled"}]'  # your `a.value`
json = JSON.parse(string)
new_password = '123456'       # or whatever
json.first['password'] = new_password
new_string = json.to_json     # "[{\"ssid\":\"LVL6-Staff\",\"password\":\"123456\",\"dhcp\":\"Enabled\"}]"

Answer 2

irb(main):010:0> v
=> [{:ssid=>"LVL6-Staff", :password=>"987654321", :dhcp=>"Enabled"}]
irb(main):020:0> v[0][:password]
=> "987654321"
irb(main):021:0> v[0][:password] = "123123"
=> "123123"
irb(main):023:0> v
=> [{:ssid=>"LVL6-Staff", :password=>"123123", :dhcp=>"Enabled"}]

刚刚在irb中测试

使用json.parse更新散列数组中的值

2 个答案: