This is expected behaviour.
*Blob* models are intended to be immutable in spirit. One file, one blob.
And if you want to do transformations of a given Blob, the idea is that
you'll simply create a new one, rather than attempt to mutate the existing
(though of course, you can delete that later if you don't need it). Because
of this, you have 2 different Blobs in your test case.
*Checksum* is calculated from the content of the file(`data`), so image `
*town.jpg*` will always produce the same checksum since it is the same
image (not the same Blob :))
I hope this helps
On Friday, March 23, 2018 at 12:43:38 AM UTC+1, Dan Hanson wrote:
>
> I'm hoping to get some clarification on the expected behavior surrounding
> uploading the same file multiple times using ActiveStorage. Currently each
> time the same file is uploaded a new ActiveStorage::Blob is created having
> a unique key but a shared checksum. This behavior surprised me but I'm
> wondering if this is a bug or intended behavior. The following test
> illustrates how I was expecting AS to behave:
>
> # activestorage/test/models/attachments_test.rb
> test "attached blobs with same checksum are shared" do
>
> @user.avatar.attach io: StringIO.new("STUFF"), filename: "town.jpg",
> content_type: "image/jpg"
>
>
> second_user = User.create!
>
> second_user.avatar.attach io: StringIO.new("STUFF"), filename:
> "town.jpg", content_type: "image/jpg"
>
>
> assert_equal @user.avatar.blob.checksum, second_user.avatar.blob.checksum
>
> assert_equal @user.avatar.blob, second_user.avatar.blob # currently
> fails
> end
>
>
>
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