在Rails中将JSON字符串转换为JSON对象

require 'json'

json_string = '{"name": "John", "age": 30, "city": "New York"}'

# 将JSON字符串解析为Ruby哈希对象
json_object = JSON.parse(json_string)

puts json_object
# 输出: {"name"=>"John", "age"=>30, "city"=>"New York"}

# 访问哈希对象中的数据
puts json_object['name']  # 输出: John
puts json_object['age']   # 输出: 30
puts json_object['city']  # 输出: New York

require 'json'

json_string = '{"name": "John", "age": 30, "address": {"city": "New York", "zip": "10001"}}'

# 将JSON字符串解析为Ruby哈希对象
json_object = JSON.parse(json_string)

puts json_object
# 输出: {"name"=>"John", "age"=>30, "address"=>{"city"=>"New York", "zip"=>"10001"}}

# 访问嵌套的哈希对象中的数据
puts json_object['address']['city']  # 输出: New York
puts json_object['address']['zip']   # 输出: 10001

require 'json'

invalid_json_string = '{"name": "John", "age": 30, "city": "New York"'

begin
  # 尝试解析无效的JSON字符串
  json_object = JSON.parse(invalid_json_string)
rescue JSON::ParserError => e
  puts "解析JSON字符串时出错: #{e.message}"
end

class MyController < ApplicationController
  def create
    # 读取请求体中的JSON字符串
    json_string = request.body.read

    # 将JSON字符串解析为Ruby哈希对象
    json_object = JSON.parse(json_string)

    # 访问哈希对象中的数据
    name = json_object['name']
    age = json_object['age']
    city = json_object['city']

    # 处理数据
    # ...

    render json: { message: '数据已成功处理' }
  rescue JSON::ParserError => e
    render json: { error: "解析JSON字符串时出错: #{e.message}" }, status: :bad_request
  end
end