Delete Batch in PouchDB

PouchDB Delete Batch
To delete a PouchDB batch, 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 delete them.
Create a file named “DeleteBatch.js” within a folder named “Examples”.

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

var PouchDB = require('PouchDB');
var db = new PouchDB('Example_Database');
docs = [{_id : '101', _rev:'1-f56789f432154adb782da98358921a14', _deleted : true },
{_id : '102', _rev: '1-3cacb3a45e5678d90870f4e92dc9876d', _deleted : true },
{_id : '103', _rev: '1-afec1229a76543db973ace8fcbacd45', _deleted : true }]
db.bulkDocs(docs, function(err, response) {
if (err) {
return console.log(err);
} else {
console.log("Batch Successfully Deleted.");
}
});

Open the command prompt.
Execute the .js file.
```
node DeleteBatch.js
```
Console Output:
Batch Successfully Deleted.
Batch Successfully Deleted.

Verification:

Check for the deleted document in the ‘Example_Database’ database in PouchDB.

To delete a Batch from Remote Database:

Instead of the database name, pass the path of the database to delete 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 “DeleteRemoteBatch.js” within a folder named “Examples”.

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

var PouchDB = require('PouchDB');
var db = new PouchDB('http://localhost:5984/students');
docs = [{_id : '101', _rev:'1-345ac229a76543db6ab5648fc987bbb5', _deleted : true },
{_id : '102', _rev:'1-1a2c3b3a45ae5111d90870f4e92dc55543', _deleted : true },
{_id : '103', _rev: '1-acb312f4321546901aada9835889ccca1', _deleted : true }]
db.bulkDocs(docs, function(err, response) {
if (err) {
return console.log(err);
} else {
console.log("Batch Successfully Deleted.");
}
});

Open the command prompt.
Execute the .js file.
```
node DeleteRemoteBatch.js
```
Console Output:
Batch Successfully Deleted.
Batch Successfully Deleted.
Verification:

Check for the deleted document in the ‘students’ database in CouchDB.