PouchDB Delete Batch

The bulkDocs() method is used to delete an array of documents in PouchDB. You just have to know the _id and _rev values of the documents that you want to delete from the database. You have to add another key-value pair _deleted: true.

We have a database named "Second_Database" stored in PouchDB and contains 3 documents:

[ { id: '001',
    key: '001',
    value: { rev: '5-f1b552f9901a408e98406c424f368a49' },
    doc:
     { age: 21,
       name: 'Rahul',
       _id: '001',
       _rev: '5-f1b552f9901a408e98406c424f368a49' } },
  { id: '002',
    key: '002',
    value: { rev: '2-4ecc64cd994d4a9cb0e4376cc5636b37' },
    doc:
     { age: 26,
       name: 'Ryan',
       _id: '002',
       _rev: '2-4ecc64cd994d4a9cb0e4376cc5636b37' } },
  { id: '003',
    key: '003',
    value: { rev: '2-01a70d54a8eb4181b17f5f6c9c2a0756' },
    doc:
     { age: 19,
       name: 'Reema',
       _id: '003',
       _rev: '2-01a70d54a8eb4181b17f5f6c9c2a0756' } } ]

Let's delete the documents using their respective _id and _rev values:

//Requiring the package
var PouchDB = require('PouchDB');
//Creating the database object
var db = new PouchDB('Second_Database');
//Preparing the document
docs = [{_id : '001', _rev: '5-f1b552f9901a408e98406c424f368a49', _deleted : true },
      {_id : '002', _rev: '2-4ecc64cd994d4a9cb0e4376cc5636b37', _deleted : true }, 
      {_id : '003', _rev: '2-01a70d54a8eb4181b17f5f6c9c2a0756', _deleted : true }]
//Deleting Documents
db.bulkDocs(docs, function(err, response) {
   if (err) {
      return console.log(err);
   } else {
      console.log(response+"Documents deleted Successfully");
   }
});

Save the above code in a file named "Delete_Batch.js" within a folder name "PouchDB_Examples". Open the command prompt and execute the JavaScript file using node:

Output:

The batch is now deleted. You can also verify it.

Verification

You can see that there is no document in database.

Delete a Batch from Remote Database

We can also delete an array of documents in a database that is stored remotely on a server (CouchDB). You just have to pass the path to the database in CouchDB, which contains the document that you want to delete.

Example

We have a database named "employees" in the CouchDB Server.

There are three documents in "employees" database

You can fetch these documents by using node (Read_Remote_Batch.js) command.

{ id: '001',
    key: '001',
    value: { rev: '7-7d47e310d011cd29c6cb1f3e6ee90b5e' },
    doc:
     { _id: '001',
       _rev: '7-7d47e310d011cd29c6cb1f3e6ee90b5e',
       age: 20,
       name: 'Rani' } },
  { id: '002',
    key: '002',
    value: { rev: '2-6cfa4cd923a6d6cb2ad6368890b308f5' },
    doc:
     { _id: '002',
       _rev: '2-6cfa4cd923a6d6cb2ad6368890b308f5',
       age: 21,
       name: 'Priya' } },
  { id: '003',
    key: '003',
    value: { rev: '2-f85f7aa70407e7cd2c6984ccd75ed2a2' },
    doc:
     { _id: '003',
       _rev: '2-f85f7aa70407e7cd2c6984ccd75ed2a2',
       age: 22,
       name: 'Kanchan' } } ]

Now delete all the documents of database "employees".

//Requiring the package
var PouchDB = require('PouchDB');
//Creating the database object
var db = new PouchDB('http://localhost:5984/employees');
//Preparing the document
docs = [{_id : '001', _rev: '7-7d47e310d011cd29c6cb1f3e6ee90b5e', _deleted : true },
      {_id : '002', _rev: '2-6cfa4cd923a6d6cb2ad6368890b308f5', _deleted : true },
      {_id : '003', _rev: '2-f85f7aa70407e7cd2c6984ccd75ed2a2', _deleted : true }]
//Deleting Documents
db.bulkDocs(docs, function(err, response) {
   if (err) {
      return console.log(err);	
   } else {
      console.log("Documents deleted Successfully");
   }
});

Save the above code in a file named "Delete_Remote_Batch.js" within a folder name "PouchDB_Examples". Open the command prompt and execute the JavaScript file using node:

Output: