Ruby on rails 使用json.parse更新哈希数组中的值

我有

a=first

，它是

=> <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">

我的问题是，在获得密码值后，我想将密码值更新为“123456789”并保存它。如何做到这一点？

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\"}]"

---

刚刚在irb中测试过，效果很好。。但如何让它节省？因此，当i

a.value

时，它将显示新密码（123456），假设

a

这里是一个模型对象，您可以执行

a.value=new\u string

和

a.save。请尝试json.first.merge！（密码：“123456”）
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\"}]"

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"}]