example workflow

Gem Version

This gem allows you to quickly integrate FilePond with your Ruby on Rails app.



Add this line to your application's Gemfile:

gem 'filepond-rails'

And then run:

$ bundle

Add the following to your application.css:

*= require 'filepond'

Add javascript_importmap_tags in the head section of your layout:

<%= javascript_importmap_tags %>

Mount filepond-rails routes:

Rails.application.routes.draw do
  mount Filepond::Rails::Engine, at: '/filepond'

Note: You must mount the routes at /filepond.


This gem compromises of two parts:

  1. An ingress controller for the FilePond fetch and remove server calls. The JavaScript code leverages Active Storage's existing direct upload endpoint.
  2. JavaScript ESM module to automatically connect configured elements with the above endpoints.

At the present moment, the above parts are designed (and assumed) to work together.

The gem assumes that you set up your models and Active Storage configuration in a standard Rails way. Assuming you have a form that looks like this:

<%= form_with model: @user, url: update_avatar_path, method: :post do |f| %>
  <%= f.label :avatar, 'Update your avatar' %>
  <%= f.file_field :avatar, class: 'filepond', direct_upload: true %>
  <%= f.button 'Update' %>
<% end %>

You can instantiate the file_field component like so:

// app/javascript/application.js
import { FilePondRails, FilePond } from 'filepond-rails'

window.FilePond = FilePond
window.FilePondRails = FilePondRails

const input = document.querySelector('.filepond')

The gem's JavaScript provide two available exports:

  1. FilePond (which corresponds to the original FilePond library)
  2. FilePondRails (which is a convenience helper that integrates and sets up FilePond to work with our FilePond::Rails::IngressController


filepond-rails is configured with Docker to help developer-contributors be able to easily work on this gem locally.

To get started:

  1. Fork this repository
  2. git clone it to your local machine and cd into it
  3. Run docker compose build

To run the gem through the "dummy" app, run:

docker compose up

To enter the development environment where you can run bin/rails g controller and other commands:

docker compose run app bash

You should now be able to run tests locally within this bash container:

bin/rails test && bin/rails app:test:system


The gem is available as open source under the terms of the MIT License.