Question 1

How to resize images with Waffle in Elixir?

Accepted Answer

Define transformations in your uploader module using the transform/2 function with ImageMagick commands, like specifying resize dimensions. Ensure ImageMagick is installed on your server, and refer to the README examples for implementation details.

Question 2

Waffle vs Arc: which is better for file uploads?

Accepted Answer

Waffle is a fork of Arc from version 0.11.0 and is actively maintained with updated dependencies. Choose Waffle for ongoing support and recent features; Arc might suit legacy projects but lacks community-driven extensions and recent fixes.

Question 3

How to test file uploads locally without S3?

Accepted Answer

Use the built-in Waffle.Storage.Local provider by configuring it in your config files. This allows testing uploads and transformations without external services, though S3-specific features won't be covered without additional setup.

Question 4

Does Waffle work with Phoenix LiveView for real-time uploads?

Accepted Answer

Yes, Waffle can integrate with Phoenix LiveView by handling file uploads in LiveView components, but it requires manual setup for progress tracking and validation, as Waffle doesn't provide built-in LiveView helpers.

Question 5

What's the best way to secure uploaded files in Waffle?

Accepted Answer

Configure storage to use private URLs and validate file types in uploader modules. For S3, set appropriate bucket policies via ex_aws, and use environment variables for sensitive credentials to prevent exposure.

Question 6

How to delete files stored with Waffle?

Accepted Answer

Call delete functions from the storage module, such as Waffle.Storage.S3.delete/1 for S3. With waffle_ecto, deletions can be automated in Ecto changesets, but orphaned files might require manual cleanup in some cases.

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