Rails 中的 JSON 输出没有将 String 隐式转换为 Integer答案

【问题标题】：No implicit conversion of String into Integer from JSON output in RailsRails 中的 JSON 输出没有将 String 隐式转换为 Integer
【发布时间】：2013-12-31 11:08:24
【问题描述】：

首先我要说我对 Ruby 和 JSON 很陌生。

在我的模型文件中，我尝试将 JSON 解析为哈希，然后将特定的键值返回给视图。

我目前收到错误消息“没有将字符串隐式转换为整数”。我的理解是 JSON 输出返回一个哈希数组，因此我试图访问并返回第一个数组键值。

app/models/word.rb

def self.search(search)
    result_json = Wordnik.word.get_definitions(search)
    result_hash = JSON.parse(result_json.to_json)     # Parse JSON to hash

    definition = result_hash.first["text"]            # return first :text key of the hash
end

Wordik.word.get_definitions 的 JSON 输出

[
      {
        "textProns"=>[],
        "sourceDictionary"=>"ahd-legacy",
        "exampleUses"=>[],
        "relatedWords"=>[],
        "labels"=>[],
        "citations"=>[],
        "word"=>"fallacy",
        "text"=>"A false notion.",
        "sequence"=>"0",
        "score"=>0.0,
        "partOfSpeech"=>"noun",
        "attributionText"=>"from The American Heritage® Dictionary of the English Language, 4th Edition"
       },

      {
        "textProns"=>[],
        "sourceDictionary"=>"ahd-legacy",
        "exampleUses"=>[],
        "relatedWords"=>[],
        "labels"=>[],
        "citations"=>[],
        "word"=>"fallacy",
        "text"=>"A statement or an argument based on a false or invalid inference.",
        "sequence"=>"1",
        "score"=>0.0,
        "partOfSpeech"=>"noun",
        "attributionText"=>"from The American Heritage® Dictionary of the English Language, 4th Edition"
      },

      {
        "textProns"=>[],
        "sourceDictionary"=>"ahd-legacy",
        "exampleUses"=>[],
        "relatedWords"=>[],
        "labels"=>[],
        "citations"=>[],
        "word"=>"fallacy",
        "text"=>"Incorrectness of reasoning or belief; erroneousness.",
        "sequence"=>"2",
        "score"=>0.0,
        "partOfSpeech"=>"noun",
        "attributionText"=>"from The American Heritage® Dictionary of the English Language, 4th Edition"
      },

      {
        "textProns"=>[],
        "sourceDictionary"=>"ahd-legacy",
        "exampleUses"=>[],
        "relatedWords"=>[],
        "labels"=>[],
        "citations"=>[],
        "word"=>"fallacy",
        "text"=>"The quality of being deceptive.",
        "sequence"=>"3",
        "score"=>0.0,
        "partOfSpeech"=>"noun",
        "attributionText"=>"from The American Heritage® Dictionary of the English Language, 4th Edition"
      }
    ]

我收到错误消息“没有将字符串隐式转换为整数”。

【问题讨论】：

将此数据复制到 IRB，并从result_hash = JSON.parse ... 开始遵循您的代码，结果我得到"A false notion."。您是否在此处省略了任何步骤？
你上面贴的数据确实是一个哈希数组。
在我的模型文件中使用以下代码创建新 Word 对象时，该输出来自控制台：'def initialize(name)''self.name = name''end''def definitions' 'Wordnik.word.get_definitions(self.name)' 'end'
但是，Wordnik API 文档指定输出数据的默认格式是 JSON，所以我不确定在我的 self.search 方法的第一行中数据输出的格式是什么。 .

标签： ruby-on-rails ruby json

【解决方案1】：

首先我认为您的 JSON 存在问题，JSON 应该使用 : 而不是 =>，然后我已将 JSON 有效负载重新格式化为

[ { "textProns":[], "sourceDictionary":"ahd-legacy", “示例使用”：[]， “相关词汇”：[]， “标签”：[]， “引用”：[]， “词”：“谬误”， "text":"一个错误的概念。", “序列”：“0”， “分数”：0.0， "partOfSpeech":"名词", "attributionText":"摘自 The American Heritage® Dictionary of the English Language, 4th Edition" },

      {
        "textProns":[],
        "sourceDictionary":"ahd-legacy",
        "exampleUses":[],
        "relatedWords":[],
        "labels":[],
        "citations":[],
        "word":"fallacy",
        "text":"A statement or an argument based on a false or invalid inference.",
        "sequence":"1",
        "score":0.0,
        "partOfSpeech":"noun",
        "attributionText":"from The American Heritage® Dictionary of the English Language, 4th Edition"
      },

      {
        "textProns":[],
        "sourceDictionary":"ahd-legacy",
        "exampleUses":[],
        "relatedWords":[],
        "labels":[],
        "citations":[],
        "word":"fallacy",
        "text":"Incorrectness of reasoning or belief; erroneousness.",
        "sequence":"2",
        "score":0.0,
        "partOfSpeech":"noun",
        "attributionText":"from The American Heritage® Dictionary of the English Language, 4th Edition"
      },

      {
        "textProns":[],
        "sourceDictionary":"ahd-legacy",
        "exampleUses":[],
        "relatedWords":[],
        "labels":[],
        "citations":[],
        "word":"fallacy",
        "text":"The quality of being deceptive.",
        "sequence":"3",
        "score":0.0,
        "partOfSpeech":"noun",
        "attributionText":"from The American Heritage® Dictionary of the English Language, 4th Edition"
      }
    ]

代码，我将payload复制到一个文件中进行解析，如果payload是JSON，我认为你不再需要to_json

[2] pry(main)> a = JSON.parse(File.read("result.json"))
=> [{"textProns"=>[],
  "sourceDictionary"=>"ahd-legacy",
  "exampleUses"=>[],
  "relatedWords"=>[],
  "labels"=>[],
  "citations"=>[],
  "word"=>"fallacy",
  "text"=>"A false notion.",
  "sequence"=>"0",
  "score"=>0.0,
  "partOfSpeech"=>"noun",
  "attributionText"=>
   "from The American Heritage® Dictionary of the English Language, 4th Edition"},
 {"textProns"=>[],
  "sourceDictionary"=>"ahd-legacy",
  "exampleUses"=>[],
  "relatedWords"=>[],
  "labels"=>[],
  "citations"=>[],
  "word"=>"fallacy",
  "text"=>"A statement or an argument based on a false or invalid inference.",
  "sequence"=>"1",
  "score"=>0.0,
  "partOfSpeech"=>"noun",
  "attributionText"=>
   "from The American Heritage® Dictionary of the English Language, 4th Edition"},
 {"textProns"=>[],
  "sourceDictionary"=>"ahd-legacy",
  "exampleUses"=>[],
  "relatedWords"=>[],
  "labels"=>[],
  "citations"=>[],
  "word"=>"fallacy",
  "text"=>"Incorrectness of reasoning or belief; erroneousness.",
[3] pry(main)> a.first
=> {"textProns"=>[],
 "sourceDictionary"=>"ahd-legacy",
 "exampleUses"=>[],
 "relatedWords"=>[],
 "labels"=>[],
 "citations"=>[],
 "word"=>"fallacy",
 "text"=>"A false notion.",
 "sequence"=>"0",
 "score"=>0.0,
 "partOfSpeech"=>"noun",
 "attributionText"=>
  "from The American Heritage® Dictionary of the English Language, 4th Edition"}
[4] pry(main)> a.first["text"]
=> "A false notion."

【讨论】：