在Rails中，没有从JSON输出到整数的隐式字符串转换

Question

首先我要说的是，我对Ruby和JSON非常陌生。

在我的模型文件中，我尝试将JSON解析为一个散列，然后将一个特定的键值返回给视图。

我现在收到错误信息“没有隐式的字符串转换为整数”。我的理解是，JSON输出返回一个哈希数组，因此我尝试访问并返回第一个数组键值。

app/model/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“没有隐式的字符串转换为整数”。

Answer 1

首先，我认为您的JSON有问题，JSON应该使用:而不是=>，然后我将JSON有效负载重新格式化为

[{ "textProns":[]，"sourceDictionary":"ahd-legacy"，"exampleUses":[]，"relatedWords":[]，"labels":[]，"citations":[]，“word”：“谬误”，“text”：“错误的概念。”，"sequence":"0"，"score":0.0，“partOfSpeech”：“名词”，“attributionText”：“摘自美国传统英语词典，第四版”}，

      {
        "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"
      }
    ]

代码中，我将有效负载复制到一个文件中进行解析，如果有效负载是JSON，我认为您不再需要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."