空手道数组字段成为对象

Question

我遇到了这个非常奇怪的问题。

我想把两个列表附加到一个列表中，但是好像空手道不支持这个功能，所以我写了一个JS函数。

function(lists){
    var arr = []
    for each (var list in lists){
        for each (var item in list){
            arr.push(item);
        }
    }
    return arr;
}

然后我写了这个功能文件用于测试：

Feature:
  Scenario:
    * def appendList = read('../utils/append-list.js')
    * def arr = [{a: 'a'}, {b: 'b'}, {c: 'c'}]
    * def arr1 = [{a: 'a'}, {b: 'b'}, {c: 'c'}]
    * def arr2 = appendList([arr, arr1])
    * print 'arr2', arr2
    * def xx = { aa: '#(arr2)' }
    * print 'xx', xx
    * copy yy = xx
    * print 'yy', yy
    * match xx == yy

这是日志：

16:00:28.424 [main] INFO  com.intuit.karate - [print] arr2 [
  {
    "a": "a"
  },
  {
    "b": "b"
  },
  {
    "c": "c"
  },
  {
    "a": "a"
  },
  {
    "b": "b"
  },
  {
    "c": "c"
  }
]

16:00:28.444 [main] INFO  com.intuit.karate - [print] xx {
  "aa": {
    "0": {
      "a": "a"
    },
    "1": {
      "b": "b"
    },
    "2": {
      "c": "c"
    },
    "3": {
      "a": "a"
    },
    "4": {
      "b": "b"
    },
    "5": {
      "c": "c"
    }
  }
}

16:00:28.466 [main] INFO  com.intuit.karate - [print] yy {
  "aa": [
    {
      "a": "a"
    },
    {
      "b": "b"
    },
    {
      "c": "c"
    },
    {
      "a": "a"
    },
    {
      "b": "b"
    },
    {
      "c": "c"
    }
  ]
}

16:00:28.469 [main] ERROR com.intuit.karate - assertion failed: path: $.aa, actual: [object Array], expected: [{"a":"a"},{"b":"b"},{"c":"c"},{"a":"a"},{"b":"b"},{"c":"c"}], reason: actual value is not list-like

com.intuit.karate.exception.KarateException: path: $.aa, actual: [object Array], expected: [{"a":"a"},{"b":"b"},{"c":"c"},{"a":"a"},{"b":"b"},{"c":"c"}], reason: actual value is not list-like

    at com.intuit.karate.StepDefs.matchNamed(StepDefs.java:540)
    at com.intuit.karate.StepDefs.matchEquals(StepDefs.java:526)
    at ✽.* match xx == yy(kromotus/test/test.feature:12)


com.intuit.karate.exception.KarateException: path: $.aa, actual: [object Array], expected: [{"a":"a"},{"b":"b"},{"c":"c"},{"a":"a"},{"b":"b"},{"c":"c"}], reason: actual value is not list-like

    at com.intuit.karate.StepDefs.matchNamed(StepDefs.java:540)
    at com.intuit.karate.StepDefs.matchEquals(StepDefs.java:526)
    at ✽.* match xx == yy(kromotus/test/test.feature:12)

不明白为什么数组有时是数组，有时又变成对象？

Answer 1

是的，默认情况下，JSON 在内部转换为 Java 列表，这可能会造成混淆。最佳做法是尽可能使用 'Java style'。在迭代时，使用带索引的 for 循环。例如，试试这些：

* def first = [{a: 1}, {b: 2}]
* def second = [{c: 3}, {d: 4}]
* eval first.addAll(second)
* print first

这个和上面的效果一样，但是比较绕：

* def append = function(f, s){ for (var i = 0; i < s.length; i++) { f.add(s[i]) }; return f }
* def first = [{a: 1}, {b: 2}]
* def second = [{c: 3}, {d: 4}]
* def result = append(first, second)
* print result

注意我们使用的是JavaList.add()和List.addAll()方法，不是JSpush。您当然可以编写在幕后执行此操作的自定义函数。

顺便说一下，下一个版本的 Karate 将引入 karate.forEach 甚至 map 和 filter 操作以使迭代更容易。也许我们需要 karate.append() 和 karate.merge()（用于合并 2 个 JSON 对象）。欢迎提出功能请求。

Answer 2

您可以尝试将JavaScript函数中的return数据转换为JSON。以下是根据我的理解解释空手道中发生的事情：

* def appendList = read('../utils/append-list.js')
* def arr = [{a: 'a'}, {b: 'b'}, {c: 'c'}]
* def arr1 = [{a: 'a'}, {b: 'b'}, {c: 'c'}]
* def arr2 = appendList([arr, arr1]) # return JS[] variable type instead of JSON object
* print 'arr2', arr2
* def xx = { aa: '#(arr2)' } 
* print 'xx', xx
* copy yy = xx
* print 'yy', yy
* match xx == yy

以下是修复方法：

* def appendList = read('append-list.js')
* json arr = [{a: 'a'}, {b: 'b'}, {c: 'c'}]
* json arr1 = [{a: 'a'}, {b: 'b'}, {c: 'c'}]
* json arr2 = appendList([arr, arr1]) # convert to JSON
* print 'arr2', arr2
* json xx = { aa: '#(arr2)' }
* print 'xx', xx
* copy yy = xx
* print 'yy', yy
* match xx == yy

日志信息：

20:37:02.034 [main] WARN com.intuit.karate - skipping bootstrap configuration: could not find or read file: karate-config.js, prefix: CLASSPATH
20:37:02.139 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $
20:37:02.142 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $
20:37:02.149 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $
20:37:02.149 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $
20:37:02.168 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $
20:37:02.169 [main] INFO com.intuit.karate - [print] arr2 [
  {
    "a": "a"
  },
  {
    "b": "b"
  },
  {
    "c": "c"
  },
  {
    "a": "a"
  },
  {
    "b": "b"
  },
  {
    "c": "c"
  }
]

20:37:02.173 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $
20:37:02.177 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $
20:37:02.178 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $['aa']
20:37:02.179 [main] DEBUG com.jayway.jsonpath.internal.JsonContext - Set path $['aa'] new value [{a=a}, {b=b}, {c=c}, {a=a}, {b=b}, {c=c}]
20:37:02.182 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $
20:37:02.183 [main] INFO com.intuit.karate - [print] xx {
  "aa": [
    {
      "a": "a"
    },
    {
      "b": "b"
    },
    {
      "c": "c"
    },
    {
      "a": "a"
    },
    {
      "b": "b"
    },
    {
      "c": "c"
    }
  ]
}

20:37:02.188 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $
20:37:02.188 [main] INFO com.intuit.karate - [print] yy {
  "aa": [
    {
      "a": "a"
    },
    {
      "b": "b"
    },
    {
      "c": "c"
    },
    {
      "a": "a"
    },
    {
      "b": "b"
    },
    {
      "c": "c"
    }
  ]
}

20:37:02.189 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $
20:37:02.189 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $
1 Scenarios ([32m1 passed[0m)
10 Steps ([32m10 passed[0m)
0m0.680s
html report: (paste into browser to view)

Result

空手道数组字段成为对象

Karate array field become object

karate