PouchDB Update Batch

The bulkDocs() method is used to update an array of documents in PouchDB. To update a batch, you have to create an array of documents where, each document contains _id, _rev and the values that you want to update.

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

{ id: '001',
    key: '001',
    value: { rev: '4-f59034f061004dbca22da61662459a16' },
    doc:
     { name: 'Ajeet',
       age: 23,
       Designation: 'Programmer',
       _id: '001',
       _rev: '4-f59034f061004dbca22da61662459a16' } },
  { id: '002',
    key: '002',
    value: { rev: '1-0c0628a46e404d90870f4e892dc2d900' },
    doc:
     { name: 'Robert',
       age: 24,
       Designation: 'Teacher',
       _id: '002',
       _rev: '1-0c0628a46e404d90870f4e892dc2d900' } },
  { id: '003',
    key: '003',
    value: { rev: '1-1dc4fe229a61420db2b657e8fcbbfa7d' },
    doc:
     { name: 'Abdul',
       age: 25,
       Designation: 'Mechanic',
       _id: '003',
       _rev: '1-1dc4fe229a61420db2b657e8fcbbfa7d' } } ]

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

Change the name and age of all three documents:

//Requiring the package
var PouchDB = require('PouchDB');
//Creating the database object
var db = new PouchDB('Second_Database');
//Preparing the document
docs = [{_id : '001', _rev:'4-f59034f061004dbca22da61662459a16', age : 21, name:  'Rahul', },
      {_id : '002', _rev: '1-0c0628a46e404d90870f4e892dc2d900', age : 26, name:  'Ryan', },
      {_id : '003', _rev: '1-1dc4fe229a61420db2b657e8fcbbfa7d', age : 19, name: 'Reema', }]
//Updating the documents in bulk
db.bulkDocs(docs, function(err, response) {
   if (err) {
      return console.log(err);
   } else {
      console.log("Documents Updated Successfully");
   }
});

Save the above code in a file named "Update_Batch2.js" within a folder name "PouchDB_Examples". Open the command prompt and execute the JavaScript file using node:

Output:

Verification

You can verify that the batch is updated by using node (Read_Batch) command:

[ { 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' } } ]

Update Batch in Remote Database

We can also update 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 update.

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: '6-bc6904f9fdcf64e8bc181e7da006db45' },
    doc:
     { _id: '001',
       _rev: '6-bc6904f9fdcf64e8bc181e7da006db45',
       name: 'Lucky',
       age: 24,
       Designation: 'Teacher' } },
  { id: '002',
    key: '002',
    value: { rev: '1-415437b4fd54d2af100e2eef26e3fad7' },
    doc:
     { _id: '002',
       _rev: '1-415437b4fd54d2af100e2eef26e3fad7',
       name: 'Raman',
       age: 25,
       Designation: 'Designer' } },
  { id: '003',
    key: '003',
    value: { rev: '1-ab07c37012e837c1654c0d6b9f22a56f' },
    doc:
     { _id: '003',
       _rev: '1-ab07c37012e837c1654c0d6b9f22a56f',
       name: 'Albert',
       age: 26,
       Designation: 'Engineer' } } ]

Now update all the documents name and age of "employees" database stored on CouchDB Server.

//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:'6-bc6904f9fdcf64e8bc181e7da006db45', age : 20, name: 'Rani'  }, 
      {_id : '002', _rev: '1-415437b4fd54d2af100e2eef26e3fad7', age : 21, 
name: 'Priya' }, 
      {_id : '003', _rev: '1-ab07c37012e837c1654c0d6b9f22a56f', age : 22, 
name: 'Kanchan'}]
//Inserting Document 
db.bulkDocs(docs, function(err, response) { 
   if (err) { 
      return console.log(err); 
   } else { 
      console.log(+"Documents Updated Successfully"); 
   } 
});

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

It will update the documents in "employees" database.

Verification

You can verify that the batch is updated by using node (Read_Remote_Batch) 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' } } ]

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