Waffle

Waffle is a flexible file upload library for Elixir with straightforward integrations for Amazon S3 and ImageMagick.

Documentation · Hex

Presentation at ElixirConf · Thinking Elixir Podcast 80

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Why use Waffle?

You want to apply file transformations, manage access rules, save files, or process files asynchronously.

Quick start

Add the :waffle dependency to mix.exs.

mix.exs

{:waffle, "== 2.0.0-rc.1"},
{:waffle_ecto, "~> 0.0"}

Configure file storage

config :waffle, storage: Waffle.Storage.Local

Read more about storage configuration and the supported adapters (including S3).

Create an uploader module with mix waffle.g avatar

defmodule MyApp.Avatar do
  use Waffle.Definition
  use Waffle.Ecto.Definition

  def storage_dir(_version, {_file, user}) do
    "users/#{user.id}/avatar/"
  end
end

Update the user schema

schema "users" do
  field :avatar, Avatar.Type
end

Cast the file payload with a changeset

changeset
|> cast_attachments(
  params,
  [:avatar],
  allow_paths: true,
  allow_urls: true
)

Read more about Ecto integration in the WaffleEcto documentation. WaffleEcto supports changeset integration and versioned URLs for cache busting.

More Examples

• An example for the Local storage driver
• An example for the S3 storage driver

Attribution

This library was forked from Arc at version v0.11.0. Special thanks to Sean Stavropoulos (@stavro) for creating Arc.

Sponsors

• Evrone, custom software development company
• Oficinaria, marketplace for in-person creative workshops in Brazil

License

Copyright 2019 Boris Kuznetsov me@achempion.com

Copyright 2015 Sean Stavropoulos

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.