What is the best way to insert an element into a JSON array at a specific index within a recurring section?

Question

What is the best way to insert an element into a JSON array at a specific index within a recurring section?

I need to include the element "delete:true" after each occurrence of "_rev" in the sample request provided below.

Original Request:

{
    "docs": [
        {
            "_id": "123",
            "_rev": "1-7836",
            },
        {
            "_id": "456",
            "_rev": "1-1192",
           }
         ]                         

}

Expected Request:

{
    "docs": [
        {
            "_id": "123",
            "_rev": "1-7836",
            "_deleted" :true
            },
        {
            "_id": "456",
            "_rev": "1-1192",
            "_deleted" :true
           }
         ]                         

}

After attempting the code below, I noticed that the ""_deleted" :true" is being inserted after the _rev element closes. Please take a look at the following code snippet and provide suggestions.

function main(params) {
for (var i = 0; i< params.docs.length; i++) {
for (var value in params.docs[i]) {
if(value == '_rev'  && params.docs[i]._rev ){ 
var string1 = JSON.stringify(params.docs[i]);
var str = ',';
var string2 = '"';
var string3 =str+string2+ '_deleted'+ string2+ ':' + "true" ;
var res =  string1 + string3  ;
}
}
}
}
  ######################
[
  "2018-01-23T09:44:23.568738362Z stdout:
  {\"_id\":\"123\",
  \"_rev\":\"1-7836\"},
  \"_deleted\":true"]

javascript arrays json object

Answer 1

Answer №1

If you want to add a non-existent attribute directly and assign it a value, you can do so with the following code snippet:

#!/usr/bin/js

var myJSON = { "docs": [ { "_id":"123", "_rev":"1-200" } ] }
console.log(myJSON);
myJSON.docs[0]["_deleted"]=true;
console.log(myJSON);

Here is the output of the example:

# js append.js 
{ docs: [ { _id: '123', _rev: '1-200' } ] }
{ docs: [ { _id: '123', _rev: '1-200', _deleted: true } ] }

You can find more detailed information in this Stack Overflow thread about adding new attributes to JSON objects using JavaScript.

It's possible that this issue has already been discussed before.

Answer 2

If you want to add a non-existent attribute directly and assign it a value, you can do so with the following code snippet:

#!/usr/bin/js

var myJSON = { "docs": [ { "_id":"123", "_rev":"1-200" } ] }
console.log(myJSON);
myJSON.docs[0]["_deleted"]=true;
console.log(myJSON);

Here is the output of the example:

# js append.js 
{ docs: [ { _id: '123', _rev: '1-200' } ] }
{ docs: [ { _id: '123', _rev: '1-200', _deleted: true } ] }

You can find more detailed information in this Stack Overflow thread about adding new attributes to JSON objects using JavaScript.

It's possible that this issue has already been discussed before.

Answer 3

Answer №2

A more elegant solution involves using the map function along with Object.assign to avoid manually generating a string.

var output = params.docs.map( s => Object.assign( {}, {"_deleted" :true}, s ) );

To obtain a JSON string representation, simply call JSON.stringify( output );

Check out this working example:

var params = {
  "docs": [{
      "_id": "123",
      "_rev": "1-7836",
    },
    {
      "_id": "456",
      "_rev": "1-1192",
    }
  ]
};
var output = params.docs.map(s => Object.assign({}, {
  "_deleted": true
}, s));
console.log(output);

Answer 4

A more elegant solution involves using the map function along with Object.assign to avoid manually generating a string.

var output = params.docs.map( s => Object.assign( {}, {"_deleted" :true}, s ) );

To obtain a JSON string representation, simply call JSON.stringify( output );

Check out this working example:

var params = {
  "docs": [{
      "_id": "123",
      "_rev": "1-7836",
    },
    {
      "_id": "456",
      "_rev": "1-1192",
    }
  ]
};
var output = params.docs.map(s => Object.assign({}, {
  "_deleted": true
}, s));
console.log(output);

Answer 5

Answer №3

let info = {
    "documents": [
        {
            "_id": "555",
            "_rev": "2-4431",
            },
        {
            "_id": "789",
            "_rev": "3-6654",
           }
         ]                         

}
let updatedData = info['documents'].map(entry => {
   entry._delete = true
   return entry
})

console.log(updatedData);

Answer 6

let info = {
    "documents": [
        {
            "_id": "555",
            "_rev": "2-4431",
            },
        {
            "_id": "789",
            "_rev": "3-6654",
           }
         ]                         

}
let updatedData = info['documents'].map(entry => {
   entry._delete = true
   return entry
})

console.log(updatedData);

Answer 7

Answer №4

Have you considered adding the ._deleted attribute directly to the document? Here are a couple of ways to do it:

function main(params) {
  for (var i = 0; i< params.docs.length; i++) {
    params.docs[i]._deleted = true;
    var res = JSON.stringify(params.docs[i]);
  }
}

Alternatively, you can use square brackets like this:

function main(params) {
  for (var i = 0; i< params.docs.length; i++) {
    params.docs[i]["_deleted"] = true;
    var res = JSON.stringify(params.docs[i]);
  }
}

Answer 8

Have you considered adding the ._deleted attribute directly to the document? Here are a couple of ways to do it:

function main(params) {
  for (var i = 0; i< params.docs.length; i++) {
    params.docs[i]._deleted = true;
    var res = JSON.stringify(params.docs[i]);
  }
}

Alternatively, you can use square brackets like this:

function main(params) {
  for (var i = 0; i< params.docs.length; i++) {
    params.docs[i]["_deleted"] = true;
    var res = JSON.stringify(params.docs[i]);
  }
}

Answer 9

Answer №5

My Solution:

     let newData = {
  items: [
    {
      _id: "123",
      _rev: "1-7836",
    },
    {
      _id: "456",
      _rev: "1-1192",
    },
  ],
};

const newArray = newData.items.map((item) => {
  item._deleted = true;
  return item;
});

console.log("UPDATED DATA>>>>>", newArray);

Updated Result:

{
    "items": [
        {
            "_id": "123",
            "_rev": "1-7836",
            "_deleted" :true
            },
        {
            "_id": "456",
            "_rev": "1-1192",
            "_deleted" :true
           }
         ]                         

}

To add an element at the beginning of the array:

newData.items[0]._deleted = true;

To add an element conditionally by ID:

let chosenId = 456;

newData.items.map((item) =>
chosenId === item._id ? (item._deleted = true) : (item._deleted = false)

Answer 10

My Solution:

     let newData = {
  items: [
    {
      _id: "123",
      _rev: "1-7836",
    },
    {
      _id: "456",
      _rev: "1-1192",
    },
  ],
};

const newArray = newData.items.map((item) => {
  item._deleted = true;
  return item;
});

console.log("UPDATED DATA>>>>>", newArray);

Updated Result:

{
    "items": [
        {
            "_id": "123",
            "_rev": "1-7836",
            "_deleted" :true
            },
        {
            "_id": "456",
            "_rev": "1-1192",
            "_deleted" :true
           }
         ]                         

}

To add an element at the beginning of the array:

newData.items[0]._deleted = true;

To add an element conditionally by ID:

let chosenId = 456;

newData.items.map((item) =>
chosenId === item._id ? (item._deleted = true) : (item._deleted = false)

What is the best way to insert an element into a JSON array at a specific index within a recurring section?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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