json - 删除 key :value from an JSON object using jq

Question

我正在尝试使用jq从JSON对象添加和删除“key:value”。我是jq的新手，但我不了解jq会给我带来的错误，因此，非常感谢向我推向正确方向的任何帮助。我的特定问题是我有一个JSON对象(如下)，并且我希望能够从JSON对象添加/删除“maxHeight”键/值。

我尝试过的一些错误提示命令...

jq 'recurse(.[]) |= del(.maxHeight)' new.json   

Cannot iterate over null (null)

 jq 'recurse(.[]) |= {maxHeight}' new.json

Cannot iterate over string ("feature")

jq 'recurse(.[]) |= .maxHeight' new.json 

Cannot index string with string "style"

new.json文件看起来像这样...

{
  "style": {
    "className": "feature",
    "showLabels": false,
    "color": "function(feature, variableName, glyphObject, track){if(feature.get(\"type\") === \"CDS\"){return \"#9CFBF5\";} else if(feature.get(\"type\") === \"exon\"){return \"#43A47F\";} else if(feature.get(\"type\") === \"intron\"){return \"#E8E8E8\";} else if(feature.get(\"type\") === \"five_prime_UTR\"){return \"#F192FE\";} else if(feature.get(\"type\") === \"three_prime_UTR\"){return \"#FEC892\";} else {return \"#FF0000\";}}",
    "arrowheadClass": null,
    "featureCss": "padding:3px;"
  },
  "menuTemplate": [
    {
      "label": "View details"
    },
    {
      "label": "Highlight a gene"
    },
    {
      "iconClass": "dijitIconBookmark",
      "content": "function(track,feature,div) { window.parent.angular.element(window.frameElement).scope().specificNote( feature[2] ) }",
      "action": "contentDialog",
      "title": "(feature{name})",
      "label": "Create Note"
    }
  ],
  "hooks": {
    "modify": " function(track,feature,div){   var checkArr=[\"Reference\",\"Missing\",\"Heterozygous\",\"NonReference\"];for(var i=0;i<feature.length;i++){for(var j=0;j<checkArr.length;j++){  if( i>3) { if( feature[i] ===  checkArr[j] ) {  if(feature[i]==\"NonReference\"){div.style.backgroundColor=\"red\"}else if(feature[i]==\"Reference\"){div.style.backgroundColor=\"green\"}else if(feature[i]==\"Heterozygous\"){div.style.backgroundColor=\"orange\"}else if(feature[i]==\"Missing\"){div.style.backgroundColor=\"grey\"} }}}}} "
  },
  "key": "cucumber_ChineseLong_v2.gff3",
  "storeClass": "JBrowse/Store/SeqFeature/NCList",
  "trackType": null,
  "maxHeight": "200px",
  "urlTemplate": "tracks/cucumber_ChineseLong_v2.gff3/{refseq}/trackData.json",
  "compress": 0,
  "label": "cucumber_ChineseLong_v2.gff3",
  "type": "JBrowse/View/Track/CanvasFeatures"
}

Answer 1

有两种方法:

目标方法，在Manipulating a JSON file with jq上一个问题的答案中得到了说明

全局方法，它忽略了特定的上下文。

下面说明了全局方法:

walk(if type == "object" and has("maxHeight") then del(.maxHeight) else . end)

实际上，这将通过更新具有指定键的任何对象来“编辑”输入。

如果您的jq没有 walk/1，则只需在调用它之前包括其def(例如可从 https://raw.githubusercontent.com/stedolan/jq/master/src/builtin.jq获得)即可。