A library to validate, convert, and upload images.
This library serves as a replacement for waffle which leaves a lot to be desired.
-
Waffle abuses
__using__macro where it could use behaviours with defined interfaces. -
It has too much levels of indirection where it doesn't need to (nested usings for example), making it harder to understend the codebase.
-
The lack or incorrectness of documentation only makes things worse.
Still this library mainly uses the same concepts as its predecessor, it just attempts to implement them differently.
There is a package named waffle_ecto that attempts to integrate waffle into ecto changesets, which is a bad decision as changesets are supposed to be pure computations without side-effects. When we add effects to them, we only catch strange behaviour.
As an example, when we call Ecto.Changeset.apply_action/2 to do
validations, we trigger storing action saving corresponding file when
we only needed to cast and validate params.
Also, with waffle_ecto we tie the process, of saving an image, to a
database action and yet don't handle image deletion on an update.
Your best bet is to manage the storing manually.
See Getting Started guide.
Documentation can be found at https://hexdocs.pm/ivcu.