Thank you for your response Dino, but I still feel like I'm missing
something because the last sentence of your Blob explanation confuses me.
Because of this, you have 2 different Blobs in your test case
>
If this is the same file attached twice on two different User model
instances I'd expect:
- a single ActiveStorage::Blob to represent this single file
- two ActiveStorage::Attachment entries to associate this single blob to
the two different Users.
If we create any variants *then* another blob is created for the variant
but to get two blobs right from the start feels to me like a bug.
Shouldn't checksums be unique within the *active_storage_blobs* table in
order to maintain the "One file, one blob"? I apologize if I'm missing
something incredibly obvious here and I appreciate your patience with me :)
Thanks again!
-Dan
On Friday, March 23, 2018 at 6:07:54 AM UTC-6, dixpac wrote:
>
> 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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