CODEWITHSUNDEEP
jsonjqdelete-operator
hcdocs
hcdocs

Reputation: 1309

Delete a JSON object when a value inside the object matches a designated value (jq)

The goal is to delete an entire object in a JSON file that contain a key/value pair specified in a JQ script.

For example, all objects with /unwanted-path/ in path would be removed:

input.json:

[
    {
        "path": "/path-1/",
        "guide": "Guide 1"
    },
    {
        "path": "/path-2/",
        "guide": "Guide 2"
    },
    {
        "path": "/unwanted-path/",
        "guide": "Guide 3"
    }
]

output.json:

[
    {
        "path": "/path-1/",
        "guide": "Guide 1"
    },
    {
        "path": "/path-2/",
        "guide": "Guide 2"
    }
]

This JQ script is the closest I have come to in terms of a potential successful approach, but of course its intent is different and does not accomplish the goal.

jq '.[] | walk(if type == "object" then del(.path) else . end)' original.json > modified.json

Is there a way to add logic there that designates a key to go with path?

The key will always be path, but there are several path values I will filter against. If there is a way to filter against more than one path value a time, that is ideal, but not critical.

Upvotes: 2

Views: 1182

Answers (1)

jpseng
jpseng

Reputation: 2210

The following code shows how to solve your task with four examples

#!/bin/bash

FILE='
[
    {
        "path": "/path-1/",
        "guide": "Guide 1"
    },
    {
        "path": "/unwanted-path-2/",
        "guide": "Guide 2"
    },
    {
        "path": "/path-3/",
        "guide": "Guide 3",
        "sub": [
            {
                "path": "/unwanted-path-4/",
                "guide": "Guide 4"
            },
            {
                "path": "/path-5/",
                "guide": "Guide 5"
            },
            [
                {
                    "path": "/path-6/",
                    "guide": "Guide 6"
                },
                {
                    "path": "/unwanted-path-7/",
                    "guide": "Guide 7"
                }
            ]
        ]
    }
]
'

UNWANTED='/unwanted-path-2/'
echo "example 1: keep only objects in array that does not have the unwanted path '$UNWANTED' (narrow search)"
jq --arg unwantedPath "$UNWANTED" \
   'map(select(.path != $unwantedPath))' <<< "$FILE"

UNWANTED='/unwanted-path-7/'
echo -e "\nexample 2: delete objects that have the unwanted path '$UNWANTED' exactly (deep search)"
jq --arg unwantedPath "$UNWANTED" \
   'del(..| objects | select(.path == $unwantedPath)) ' <<< "$FILE"

UNWANTED='unwanted'
echo -e "\nexample 3: delete objects that have the unwanted path '$UNWANTED' partially (deep search)"
jq --arg unwantedPath "$UNWANTED" \
   'del(..| objects | select(.path | index($unwantedPath) != null)) ' <<< "$FILE"

UNWANTED='["/unwanted-path-4/", "/unwanted-path-7/"]'
echo -e "\nexample 4: delete objects that have one of unwanted paths '$UNWANTED' (deep search)"
jq --argjson unwantedPath "$UNWANTED" \
   'del(..| objects | select(.path | IN($unwantedPath[]))) ' <<< "$FILE"

output example 1: keep only objects in array that does not have the unwanted path '/unwanted-path-2/' (narrow search)

[
  {
    "path": "/path-1/",
    "guide": "Guide 1"
  },
  {
    "path": "/path-3/",
    "guide": "Guide 3",
    "sub": [
      {
        "path": "/unwanted-path-4/",
        "guide": "Guide 4"
      },
      {
        "path": "/path-5/",
        "guide": "Guide 5"
      },
      [
        {
          "path": "/path-6/",
          "guide": "Guide 6"
        },
        {
          "path": "/unwanted-path-7/",
          "guide": "Guide 7"
        }
      ]
    ]
  }
]

output example 2: delete objects that have the unwanted path '/unwanted-path-7/' exactly (deep search)

[
  {
    "path": "/path-1/",
    "guide": "Guide 1"
  },
  {
    "path": "/unwanted-path-2/",
    "guide": "Guide 2"
  },
  {
    "path": "/path-3/",
    "guide": "Guide 3",
    "sub": [
      {
        "path": "/unwanted-path-4/",
        "guide": "Guide 4"
      },
      {
        "path": "/path-5/",
        "guide": "Guide 5"
      },
      [
        {
          "path": "/path-6/",
          "guide": "Guide 6"
        }
      ]
    ]
  }
]

output example 3: delete objects that have the unwanted path 'unwanted' partially (deep search)

[
  {
    "path": "/path-1/",
    "guide": "Guide 1"
  },
  {
    "path": "/path-3/",
    "guide": "Guide 3",
    "sub": [
      {
        "path": "/path-5/",
        "guide": "Guide 5"
      },
      [
        {
          "path": "/path-6/",
          "guide": "Guide 6"
        }
      ]
    ]
  }
]

output example 4: delete objects that have one of unwanted paths '["/unwanted-path-4/", "/unwanted-path-7/"]' (deep search)

[
  {
    "path": "/path-1/",
    "guide": "Guide 1"
  },
  {
    "path": "/unwanted-path-2/",
    "guide": "Guide 2"
  },
  {
    "path": "/path-3/",
    "guide": "Guide 3",
    "sub": [
      {
        "path": "/path-5/",
        "guide": "Guide 5"
      },
      [
        {
          "path": "/path-6/",
          "guide": "Guide 6"
        }
      ]
    ]
  }
]

Upvotes: 8

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