ruby:从嵌套的json中提取字段

{
  "user": {
    "id": 123,
    "name": "Alice",
    "address": {
      "city": "New York",
      "zipcode": "10001"
    }
  },
  "orders": [
    {
      "id": 456,
      "product": "Laptop",
      "price": 999.99
    }
  ]
}

require 'json'

json_data = <<-JSON
{
  "user": {
    "id": 123,
    "name": "Alice",
    "address": {
      "city": "New York",
      "zipcode": "10001"
    }
  },
  "orders": [
    {
      "id": 456,
      "product": "L铃薯",
      "price": 999.99
    }
  ]
}
JSON

data = JSON.parse(json_data)

# 提取用户ID
user_id = data['user']['id']
puts "User ID: #{user_id}"

# 提取用户城市
user_city = data['user']['address']['city']
puts "User City: #{user_city}"

# 提取订单产品
order_product = data['orders'][0]['product']
puts "Order Product: #{order_product}"

user_city = data.dig('user', 'address', 'city')
puts "User City: #{user_city || 'Not found'}"

if data['orders'].length > 0
  order_product = data['orders'][0]['product']
  puts "Order Product: #{order_product}"
else
  puts "No orders found"
end