How to delete an image on s3 using ex_aws & arc in Phoenix

Phoenix Forum Questions / Help
#1

Hi, I’m using ex_aws and arc to upload images to AWS S3.

Everything is working fine, but I can’t get the object delete function to work. The example on the arc page is as follows:

Without a scope:

{:ok, path} = DummyDefinition.store("/Images/me.png")
:ok = DummyDefinition.delete(path)

With a scope:

user = Repo.get! User, 1
{:ok, path} = DummyDefinition.store({"/Images/me.png", user})
:ok = DummyDefinition.delete({path, user})

I’m new to Elixir and Phoenix (latest versions of both). I’m not sure what to replace DummyDefinition with in my delete function.

i’d appreciate any pointers in the right direction. Thanks.

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#2

Hi, I’m using ex_aws and arc to upload images to AWS S3.

Everything is working fine, but I can’t get the object delete function to work. The example on the arc page is as follows:

I don’t know anything about arc (other than it appears to be all
macros and no documentation!) but – why don’t you just use
ExAws.S3 directly? It’s pretty straightforward, e.g.

ExAws.S3.delete_object(“bucket-name”, “file-name”) |> ExAws.request()

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#3

You have a good point there Sir. Less magic is good.

Bear in mind ex_aws_s3 is also undocumented. Is this the norm in Elixir world or anomalous?

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#4

Replace DummyDefinition with your uploader module. Then delete/1 will trigger Arc.Actions.Delete.delete/2.

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#5

Arc is good when it comes to image attachments, it gives you ability to validate, transform images, create thumbnails easily. with arc_ecto you can define a field as Definition.Type + cast_attachment and let it do the job, much similar to CarrierWave in rails.

So, suppose your file name is my_image.png, and you have 2 versions of the image: [:original, :thumb]. you only have to ask arc to delete it once, both image versions will be deleted.