如何在 Ruby 中解析 json 文件

Question

我有一些关于在 ruby​​ 中使用 json 文件的问题。

所以我的 JSON 文件包含以下信息：

 {
  "2018-12-11": {
    "USD": 1.1379,
    "JPY": 128.75,
    "BGN": 1.9558,
    "CZK": 25.845,
    "DKK": 7.4641,
    "GBP": 0.90228,
    "HUF": 323.4,
    "PLN": 4.2983,
    "RON": 4.6557,
    "SEK": 10.297,
    "CHF": 1.1248,
    "ISK": 140.2,
    "NOK": 9.7038,
    "HRK": 7.3943,
    "RUB": 75.5225,
    "TRY": 6.1295,
    "AUD": 1.5778,
    "BRL": 4.4417,
    "CAD": 1.5239,
    "CNY": 7.8498,
    "HKD": 8.8934,
    "IDR": 16625.0,
    "ILS": 4.2691,
    "INR": 81.8215,
    "KRW": 1284.17,
    "MXN": 23.0209,
    "MYR": 4.7615,
    "NZD": 1.6526,
    "PHP": 60.009,
    "SGD": 1.5617,
    "THB": 37.317,
    "ZAR": 16.2903
  },
  "2018-12-10": {
    "USD": 1.1425,
    "JPY": 128.79,
    "BGN": 1.9558,
    "CZK": 25.866,
    "DKK": 7.4639,
    "GBP": 0.90245,
    "HUF": 323.15,
    "PLN": 4.2921,
    "RON": 4.6502,
    "SEK": 10.333,
    "CHF": 1.1295,
    "ISK": 140.0,
    "NOK": 9.6885,
    "HRK": 7.387,
    "RUB": 75.8985,
    "TRY": 6.0499,
    "AUD": 1.5842,
    "BRL": 4.4524,
    "CAD": 1.5218,
    "CNY": 7.8967,
    "HKD": 8.9283,
    "IDR": 16671.36,
    "ILS": 4.2642,
    "INR": 82.7284,
    "KRW": 1287.42,
    "MXN": 23.132,
    "MYR": 4.7671,
    "NZD": 1.6581,
    "PHP": 60.367,
    "SGD": 1.5667,
    "THB": 37.525,
    "ZAR": 16.3463
  }

我的 json 文件中有更多日期。我努力了

require 'json'

file = File.read('eurofxref-hist-90d.json')

Parse Data from File.data_hash = JSON.parse(file)

我收到一个错误

rb:7:in <main>': undefined methoddata_hash=' for File:Class (NoMethodError)。

我对 Ruby 很陌生，不知道自己在做什么。基本上我想从 json 文件中获取信息，这样我就可以开发一种方法，以浮点形式返回from_currency之间的汇率。to_currencydate

Answer 1

您提供的代码没问题：

require 'json'
file = File.read('eurofxref-hist-90d.json')
data_hash = JSON.parse(file)

数据的问题，在末尾添加右括号：

{ "2018-12-11": { "USD": 1.1379, "JPY": 128.75, "BGN": 1.9558, "CZK": 25.845, "DKK": 7.4641, "GBP": 0.90228, "HUF": 323.4, "PLN": 4.2983, "RON": 4.6557, "SEK": 10.297, "CHF": 1.1248, "ISK": 140.2, "NOK": 9.7038, "HRK": 7.3943, "RUB": 75.5225, "TRY": 6.1295, "AUD": 1.5778, "BRL": 4.4417, "CAD": 1.5239, "CNY": 7.8498, "HKD": 8.8934, "IDR": 16625.0, "ILS": 4.2691, "INR": 81.8215, "KRW": 1284.17, "MXN": 23.0209, "MYR": 4.7615, "NZD": 1.6526, "PHP": 60.009, "SGD": 1.5617, "THB": 37.317, "ZAR": 16.2903 }, "2018-12-10": { "USD": 1.1425, "JPY": 128.79, "BGN": 1.9558, "CZK": 25.866, "DKK": 7.4639, "GBP": 0.90245, "HUF": 323.15, "PLN": 4.2921, "RON": 4.6502, "SEK": 10.333, "CHF": 1.1295, "ISK": 140.0, "NOK": 9.6885, "HRK": 7.387, "RUB": 75.8985, "TRY": 6.0499, "AUD": 1.5842, "BRL": 4.4524, "CAD": 1.5218, "CNY": 7.8967, "HKD": 8.9283, "IDR": 16671.36, "ILS": 4.2642, "INR": 82.7284, "KRW": 1287.42, "MXN": 23.132, "MYR": 4.7671, "NZD": 1.6581, "PHP": 60.367, "SGD": 1.5667, "THB": 37.525, "ZAR": 16.3463 } }