Question 1

How to set up file uploads with Arc.Ecto in a Phoenix app?

Accepted Answer

Add the arc_ecto dependency, define an Arc module with Arc.Ecto.Definition, create a string column in your migration, use Arc.Ecto.Schema in your Ecto schema, and handle uploads via cast_attachments in changesets, as outlined in the usage section with avatar examples.

Question 2

Arc.Ecto vs Waffle for Elixir file uploads: which is better?

Accepted Answer

Arc.Ecto is better if you're deeply integrated with Ecto and want changeset-based uploads, while Waffle offers more flexibility with direct uploads and different storage backends but less Ecto-native support. Choose based on your need for database coupling versus standalone file handling.

Question 3

How to generate signed URLs for uploaded files with Arc.Ecto?

Accepted Answer

Use the url function with the signed: true option, as shown in the README examples. This works for both original and rendition URLs, leveraging Arc's underlying signing capabilities for secure access to stored files.

Question 4

Does Arc.Ecto support image resizing or transformations?

Accepted Answer

Yes, through Arc's rendition system. Define transformations in your Arc definition, and Arc.Ecto will handle storing and retrieving different versions, with URLs generated for each rendition like thumbnails, as mentioned in the key features.

Question 5

How to validate file types or sizes in Arc.Ecto changesets?

Accepted Answer

Combine Ecto validations like validate_required with Arc's definition callbacks, such as validate/1 in your Arc module, to check file attributes. However, validation is split between Arc and Ecto, which can add complexity compared to unified solutions.

Question 6

Can I use Arc.Ecto with multiple attachments per schema?

Accepted Answer

Yes, by defining multiple fields with the custom Arc.Ecto type and including them in cast_attachments, but ensure your database has corresponding string columns and handle each attachment separately in changesets, which might scale poorly for many files.

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