Update Batch in PouchDB

PouchDB Update Batch To update a batch in PouchDB, the bulkDocs() method is used.

Example:

Retrieve the values of a bulk document. Output:

[ {  id: '101',
key: '101',
value: { rev: '1-f56789f432154adb782da98358921a14' },
doc:
{ name: 'Tom',
salary: 25000,
experience: 3,
_id: '101',
_rev: '1-f56789f432154adb782da98358921a14' } },
{ id: '102',
key: '102',
value: { rev: '1-3cacb3a45e5678d90870f4e92dc9876d' },
doc:
{name: 'Jerry',
salary: 20000,
experience: 2,
_id: '102',
_rev: '1-3cacb3a45e5678d90870f4e92dc9876d' } },
{ id: '103',
key: '103',
value: { rev: '1-afec1229a76543db973ace8fcbacd45' },
doc:
{ name: 'Bruno',
salary: 30000,
experience: 4,
_id: '103',
_rev: '1-afec1229a76543db973ace8fcbacd45' } } ]

Using the respective _id and _rev values of the document to update them.
Create a file named “UpdateBatch.js” within a folder named “Examples”.

Add the below code to the file. UpdateBatch.js:

var PouchDB = require('PouchDB');
var db = new PouchDB('Example_Database');
docs = [{_id : '101', _rev:'1-f56789f432154adb782da98358921a14', salary : 30000, name:  'Smith' },
{_id : '102', _rev: '1-3cacb3a45e5678d90870f4e92dc9876d', salary : 25000, name:  'John' },
{_id : '103', _rev: '1-afec1229a76543db973ace8fcbacd45', salary : 35000, name: 'Holmes' }]
db.bulkDocs(docs, function(err, response) {
if (err) {
return console.log(err);
} else {
console.log("Batch Successfully Updated.");
}
});

Open the command prompt.
Execute the .js file.
```
node UpdateBatch.js
```
Console Output:
Batch Successfully Updated.
Batch Successfully Updated.

Verification:

Verify the update by reading batch again:

Output:

[ { id: '101',
key: '101',
value: { rev: '2-a456ba2f9901a408e98406c424f390a23' },
doc:
{  salary : 30000,
name:  'Smith',
_id: '101',
_rev: '2-a456ba2f9901a408e98406c424f390a23' } },
{ id: '102',
key: '102',
value: { rev: '2-5cc4bbcd994d4a9cb0e4376cc5acaba56' },
doc:
{ salary : 25000,
name:  'John',
_id: '102',
_rev: '2-5cc4bbcd994d4a9cb0e4376cc5acaba56' } },
{ id: '103',
key: '103',
value: { rev: '2-345acb54a8eb4181b17f5f6c9c2b5b6c7' },
doc:
{ salary : 35000,
name: 'Holmes',
_id: '103',
_rev: '2-345acb54a8eb4181b17f5f6c9c2b5b6c7' } } ]

To update Batch in Remote Database:

Instead of the database name, pass the path of the database to update a batch in CouchDB or remote server. Example:

Retrieve the values of a bulk document. Output:

[ {  id: '101',
key: '101',
value: { rev: '1-acb312f4321546901aada9835889ccca1' },
doc:
{ name: 'Tom',
salary: 25000,
experience: 3,
_id: '101',
_rev: '1-acb312f4321546901aada9835889ccca1' } },
{ id: '102',
key: '102',
value: { rev: '1-1a2c3b3a45ae5111d90870f4e92dc55543' },
doc:
{name: 'Jerry',
salary: 20000,
experience: 2,
_id: '102',
_rev: '1-1a2c3b3a45ae5111d90870f4e92dc55543' } },
{ id: '103',
key: '103',
value: { rev: '1-345ac229a76543db6ab5648fc987bbb5' },
doc:
{ name: 'Bruno',
salary: 30000,
experience: 4,
_id: '103',
_rev: '1-345ac229a76543db6ab5648fc987bbb5' } } ]

Using the respective _id and _rev values of the document to update them.
Create a file named “UpdateRemoteBatch.js” within a folder named “Examples”.

Add the below code to the file. UpdateRemoteBatch.js:

var PouchDB = require('PouchDB');
var db = new PouchDB('http://localhost:5984/students');
docs = [{_id : '101', _rev:'1-345ac229a76543db6ab5648fc987bbb5', salary : 30000, name:  'Smith' },
{_id : '102', _rev:'1-1a2c3b3a45ae5111d90870f4e92dc55543', salary : 25000, name:  'John' },
{_id : '103', _rev: '1-acb312f4321546901aada9835889ccca1', salary : 35000, name: 'Holmes' }]
db.bulkDocs(docs, function(err, response) {
if (err) {
return console.log(err);
} else {
console.log("Batch Successfully Updated.");
}
});

Open the command prompt.
Execute the .js file.
```
node UpdateRemoteBatch.js
```
Console Output:
Batch Successfully Updated.
Batch Successfully Updated.

Verification:

Verify the update by reading batch again:

Output:

[ { id: '101',
key: '101',
value: { rev: '2-b443aabf965ba789406c424f344455661' },
doc:
{  salary : 30000,
name:  'Smith',
_id: '101',
_rev: '2-b443aabf965ba789406c424f344455661' } },
{ id: '102',
key: '102',
value: { rev: '2-567a2354a8eaca6b4181b132456accbba' },
doc:
{ salary : 25000,
name:  'John',
_id: '102',
_rev: '2-567a2354a8eaca6b4181b132456accbba' } },
{ id: '103',
key: '103',
value: { rev: '2-d321abc54a8eb4181b17f5f6c9c27845cac' },
doc:
{ salary : 35000,
name: 'Holmes',
_id: '103',
_rev: '2-d321abc54a8eb4181b17f5f6c9c27845cac' } } ]

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