Question

我是红宝石的新手。我有一个以下格式的现有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程序中读取此文件，并想要另一个场景到此文件，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"
          }
        ]
      }
    ]
  }
}

我已使用以下代码

阅读了该文件

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

当我尝试以下代码时

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

它给我一个错误未定义的方法`[] =＆＃39; for nil：NilClass（NoMethodError）变量@scenario只有1次出现，它不允许我添加第二次出现。

有人可以帮我解决这个问题。

Answer 1

那是因为@scenario = @ASR_Test['Scenario']，@scenario会有：

[
  {
    "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]会产生：nil

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

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

要解决此问题，您必须在给定索引上添加Hash对象：

@scenario[1] = {}

然后您的上述代码将起作用：

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

Answer 2

在@scenario中你有Array个对象，所以如果你想在这个数组中添加新的哈希，只需使用这样的Array#<<方法。

因为Array是对象，所以可以在此对象中添加数据。

new_scenario = {
  "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"
    }
  ]
}

@scenario << new_scenario

@template_file现在包含new_scenario

将新值附加到ruby中的现有JSON数组

2 个答案: