PouchDB Delete Attachment

The removeAttachment() method is used to delete an attachment from PouchDB. You have to pass the document_id, attachment_id and _rev value with this method to delete attachmet. This method also accepts an optional callback function.

Syntax:

Delete Attachment Example

We have a document in PouchDB with id 002, which contains id, name, age, designation of an employee with attachment.

{ name: 'Aryan',
  age: 21,
  designation: 'Teacher',
  _attachments:
   { 'attachment1.txt':
      { content_type: 'text/plain',
        revpos: 2,
        digest: 'md5-k7iFrf4NoInN9jSQT9WfcQ==',
        data: 'AA==' } },
  _id: '002',
  _rev: '2-388510d44393457cb06764dd89542ef3' }

Let's remove the attachment by using removeAttachment() method.

//Requiring the package
var PouchDB = require('PouchDB');
//Creating the database object
var db = new PouchDB('Last_Database');
db.removeAttachment('002', 'attachment_1.txt', '2-388510d44393457cb06764dd89542ef3',
function(err, res) {
if (err) {
  return console.log(err);
} else {
  console.log(res+"Attachment Deleted successfully")
}
});

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

Output:

Attachment is deleted successfully.

Verification

You can verify that the attachment is deleted from the document by using read command.

Delete Attachment from a Remote Database

You can delete an attachment from a remotely stored server (CouchDB). You just have to pass the path to the database in CouchDB, which contains the document that contains the attachment.

Example

We have a database name "employees" stored on the CouchDB server.

The database "employees" has a document having id "001".

Let's delete the attachment.

//Requiring the package 
var PouchDB = require('PouchDB');
//Creating the database object 
var db = new PouchDB('http://localhost:5984/employees');

db.removeAttachment('001', 'att_1.txt', '10-4263773fcdb9632c28765e3f614bd261', 
   function(err, res) { 
   if (err) { 
      return console.log(err); 
   } else { 
      console.log(res+"Attachment Deleted successfully") 
   } 
});

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

Output: