arrays - 将新值附加到 ruby​​ 中的现有 JSON 数组

Question

我是 ruby 新手。我有以下格式的现有 JSON 文件。

{
  "ASRtest": {
    "ASRHDR": "This is asr HDR",
    "ASRTestType": "DevTest",
    "Scenario": [
      {
        "ScenarioNumber": 1,
        "ScenarioName": "HTTP Validation",
        "ScenarioDescription": "Validate if the API alows access over HTTP",
        "ScExecutionStatus": "Execution Complete",
        "ScenarioStatus": "In-Complete",
        "ScenarioSeverity": false,
        "TestCase": [
          {
            "TestCaseNumber": 1,
            "TestCaseName": "HTTP Validation - using POST method ",
            "TcExecutionStatus": "Execution Error",
            "TcStatus": "NA",
            "TcSeverity": "NA"
          }
        ]
      }
    ]
  }
}

我正在我的 ruby​​ 程序中读取这个文件，并且想要这个文件的另一个场景，比如

{
  "ASRtest": {
    "ASRHDR": "This is asr HDR",
    "ASRTestType": "DevTest",
    "Scenario": [
      {
        "ScenarioNumber": 1,
        "ScenarioName": "HTTP Validation",
        "ScenarioDescription": "Validate if the API alows access over HTTP",
        "ScExecutionStatus": "Execution Complete",
        "ScenarioStatus": "In-Complete",
        "ScenarioSeverity": false,
        "TestCase": [
          {
            "TestCaseNumber": 1,
            "TestCaseName": "HTTP Validation - using POST method ",
            "TcExecutionStatus": "Execution Error",
            "TcStatus": "NA",
            "TcSeverity": "NA"
          }
        ]
      },
      {
        "ScenarioNumber": 2,
        "ScenarioName": "SC2",
        "ScenarioDescription": "Desc",
        "ScExecutionStatus": "Execution Complete",
        "ScenarioStatus": "In-Complete",
        "ScenarioSeverity": false,
        "TestCase": [
          {
            "TestCaseNumber": 1,
            "TestCaseName": "Some Name ",
            "TcExecutionStatus": "Execution Error",
            "TcStatus": "NA",
            "TcSeverity": "NA"
          }
        ]
      }
    ]
  }
}

我已经使用下面的代码读取了文件

@template_file = JSON.parse(File.read('SummaryTemplate.json'))
@ASR_Test = @template_file['ASRtest']
@ASR_Test
@scenario = @ASR_Test['Scenario']

当我尝试下面的代码时

@scenario[1]['ScenarioNumber'] = 2

它给我一个错误 undefined method `[]=' for nil:NilClass (NoMethodError)变量@scenario 只出现了 1 次，不允许我添加第二次。

有人可以帮我解决这个问题吗？

Answer 1

那是因为从 @scenario = @ASR_Test['Scenario'] 开始，@scenario 将有:

[
  {
    "ScenarioNumber": 1,
    "ScenarioName": "HTTP Validation",
    "ScenarioDescription": "Validate if the API alows access over HTTP",
    "ScExecutionStatus": "Execution Complete",
    "ScenarioStatus": "In-Complete",
    "ScenarioSeverity": false,
    "TestCase": [
      {
        "TestCaseNumber": 1,
        "TestCaseName": "HTTP Validation - using POST method ",
        "TcExecutionStatus": "Execution Error",
        "TcStatus": "NA",
        "TcSeverity": "NA"
      }
    ]
  }
]

并说 @scenario[1] 将产生:nil

这意味着，调用 @scenario[1]['ScenarioNumber'] 会引发异常:

`[]=' for nil:NilClass (NoMethodError) the variable @scenario

要解决它，您必须在给定索引上添加一个Hash 对象:

@scenario[1] = {}

那么你上面的代码就可以工作了:

@scenario[1]['ScenarioNumber'] = 2