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使用Ruby on Rails解析JSON

[英]Parsing JSON with Ruby on Rails

 原文  2014-07-03 03:30:24  1   2    ruby-on-rails/ ruby/ json

问题描述

我怀疑这是一个相当基本的概念，但是经过两天的反复试验，谷歌搜索和随机键盘混搭，我感到很沮丧。 我正在尝试解析从URL返回的JSON，但遇到一个我怀疑与JSON中的数组有关的问题。

我究竟做错了什么？

JSON： 

{
"HotelInformationResponse": {
    "@hotelId": "106347",
    "customerSessionId": "0ABAA83F-4430-B291-3432-E0A2DC790CA0",
    "HotelImages": {
        "@size": "16",
        "HotelImage": [
            {
                "hotelImageId": 4694179,
                "name": "",
                "category": 1,
                "type": 0,
                "caption": "Exterior",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_44_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_44_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694182,
                "name": "",
                "category": 2,
                "type": 0,
                "caption": "Lobby",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_47_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_47_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694171,
                "name": "",
                "category": 2,
                "type": 0,
                "caption": "Lobby",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_36_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_36_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694174,
                "name": "",
                "category": 2,
                "type": 0,
                "caption": "Lobby",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_39_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_39_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694168,
                "name": "",
                "category": 3,
                "type": 0,
                "caption": "Guest Room",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_33_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_33_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694173,
                "name": "",
                "category": 3,
                "type": 0,
                "caption": "Guest Room",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_38_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_38_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694177,
                "name": "",
                "category": 3,
                "type": 0,
                "caption": "Guest Room",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_42_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_42_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694165,
                "name": "",
                "category": 10,
                "type": 0,
                "caption": "Restaurant",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_30_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_30_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694166,
                "name": "",
                "category": 10,
                "type": 0,
                "caption": "Restaurant",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_31_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_31_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 6601500,
                "name": "",
                "category": 11,
                "type": 0,
                "caption": "Interior",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_56_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_56_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694176,
                "name": "",
                "category": 12,
                "type": 0,
                "caption": "Pool",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_41_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_41_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694170,
                "name": "",
                "category": 12,
                "type": 0,
                "caption": "Pool",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_35_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_35_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694172,
                "name": "",
                "category": 12,
                "type": 0,
                "caption": "Pool",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_37_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_37_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694180,
                "name": "",
                "category": 21,
                "type": 0,
                "caption": "Lounge/Bar",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_45_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_45_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694181,
                "name": "",
                "category": 21,
                "type": 0,
                "caption": "Lounge/Bar",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_46_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_46_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            },
            {
                "hotelImageId": 4694175,
                "name": "",
                "category": 38,
                "type": 0,
                "caption": "Suite",
                "url": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_40_b.jpg",
                "thumbnailUrl": "http://images.travelnow.com/hotels/1000000/10000/5900/5900/5900_40_t.jpg",
                "supplierId": 13,
                "width": 350,
                "height": 350,
                "byteSize": 0
            }
        ]
    }
}

}

我的简化代码： 

api = Expedia::Api.new
response = api.get_information({:hotelId => '106347'}) 
data = response.body
parsed = JSON.parse(data.to_json)

thumbnail = parsed['HotelInformationResponse']['HotelImages']['HotelImage']['thumbNailUrl']

这将在缩略图行中返回错误“没有将字符串隐式转换为整数”。 我知道JSON列出了一个以上的'thumbNailUrl'，我需要指定请求的内容，但不确定如何执行。 我只想检索第一个'thumbNailUrl'。

顺便说一句，我正在使用的EAN API gem位于以下位置： https : //github.com/zaidakram/expedia

2 个解决方案

解决方案1
 0  2014-07-03 03:32:55

要获得第一张酒店图片，您可以执行以下操作： 

thumbnail = parsed['HotelInformationResponse']['HotelImages']['HotelImage'][0]['thumbNailUrl']

如果要获取所有缩略图，可以执行以下操作： 

thumbnails = []

parsed['HotelInformationResponse']['HotelImages']['HotelImage'].each { |thumbnail| thumbnails << thumbnail['thumNailUrl'] }

解决方案2
 0 已采纳  2014-07-03 03:33:34

parsed['HotelInformationResponse']['HotelImages']这一行parsed['HotelInformationResponse']['HotelImages']为您提供了一个Hash Array 。 因此，您需要按索引访问数组中的每个Hash 。 因此，您需要执行以下操作： 

parsed['HotelInformationResponse']['HotelImages']['HotelImage'][0]['thumbnailUrl']

如果要获取所有缩略图 ，请按照以下步骤对其进行迭代 

thumbnails = parsed['HotelInformationResponse']['HotelImages']['HotelImage'].map do |hash|
   hash[thumbnailUrl]
end

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